Marshall JCM900 SL-X No: 3

My third rebuild of a Marshall JCM900 SL-X. This one was modded before and upgraded with Mullard mustard caps.

Here it is before my modification.

Here are the parts I took out of this amp.

Here it is after my modification.

The whole preamp circuit is revoiced and changed to get a tight and focused distortion that is very dynamic and versatile. You can play anything from metal, classic rock, broken up cleans and crisp clean just turning the two gain controls. The power amp is also revoiced and got a punch control which gives you great control over the bottom end. The power supply got some new electrolytic caps with higher voltage and temperature specs as well.

Klemt Echolette BS40

I have rebuilt this wonderful old German amp. Here are some pics that show what it looked like before I put my soldering iron in it: This is not the correct way to replace a fuse 🙂

Here are some pics from my rebuilding process:

It’s a four input, one channel amp where all four inputs sound different; input 1: bright hi-gain, input 2: normal hi-gain, input 3: bright low-gain, input 4: normal low-gain. The amp has the following controls: gain, master volume, treble, middle, bass and presence. I’ve also installed a tube buffered effects loop. The preamp tubes in this amp are ECC808 which compared to ECC83/12ax7 have lower noise, symmetric inner construction and lower microphonics but has the same characteristics as the ECC83/12ax7 (different pinout). For this amp project, I’ve focused to get extreme dynamics and tons of attack in the sound. You can play anything just dialing the volume on the guitar.

For these two clips, I’m playing through input 1, guitar straight into the amp.

Guitar: Greco EGF-1000.
TC G-major in the loop for some delays.
Cab: Malmberg 4×12 with old Greenbacks.
Mics: Golden Age R1 mkIII, Tascam DR-40

Another SL-X

I’ve modded another Marshall JCM 900 SL-X.

 Here it is before the mod.

 You can see some electrolytic caps were swollen, these are now replaced with new caps with higher voltage and temperature rating.

And here it is after the mod. The whole preamp circuit is revoiced and changed to get a tight and focused distortion with a lot of sustain. The power amp is also revoiced and got a punch control. The customer who ordered this mod plays in a Iron Maiden tribute band and wanted the amp to handle classic Iron Maiden sounds.

Here’s a sound clip of it:

Guitar straight into the amp.
TC G-major in the loop for some delays.
Cab: Malmberg 4×12 with old Greenbacks.
Mics: Golden Age R1 mkIII and Tascam DR-40

Mesa Triple Rectifier

Untitled-1 Untitled-1-1Untitled-1-2 Untitled-1-3 Untitled-1-4 Untitled-1-5 Untitled-1-13 Untitled-1-12

I’ve modded another Triple Rectifier. Channel 2 and 3 are much angrier, extremely tight, and still a lot more dynamic after this mod, you can roll back the volume on the guitar and get crisp clean even at insane distortion levels. The overall noise is reduced as well compared to a stock Mesa rectifier since I changed the bad layout. Channel 1 is more crisp sounding and with the switch set to pushed it breaks up nicely without losing its character.

This is a 120V version Mesa. Get in touch if you want the same mod done to your dual or triple rectifier.

Guitar (Hagström Swede) straight into the amp (no pedals).
TC G-major II in the loop for some delays.
Cab: Malmberg 4×12 with old Greenbacks.
Mics: Golden Age R1 mkIII, Tascam DR-40

Fender Dual Showman

Untitled-1-6Untitled-1-9 Untitled-1-7Untitled-1-11

Before the mod:IMG_8419

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And after:Untitled-1-15

I’ve done some work to this beautiful old Fender Dual Showman. It was modified by someone before and wasn’t working properly. After my rebuild, it has a new distortion channel with gain, volume, treble, middle, bass and a three-way bright switch. I’ve also installed a tube buffered effects loop and a presence and punch control for the power amp. By pulling out the master volume the frequency range of the punch control changes which gives you a great control over the bottom end. The vibrato channel sounded so good that I kept it, just a few adjustments are done to it and it still has its original spring reverb, but the vibrato circuit is removed to give room for the effects loop. The channels are switchable via footswitch or a toggle switch on the front panel. It still carries the original Philips 6L6 tubes which still measures excellent after 40+ years!

Guitar (Greco EGF-1000) straight into the amp.
TC G-major II in the loop for some delays.
Cab: Malmberg 4×12 with old Greenbacks.
Mics: Golden Age R1 mkIII, Tascam DR-40

This amp is currently for sale, please contact me if you are interested!

Marshall JCM900 SL-X

IMG_9598

Here it is before the mod:IMG_9333

And after:IMG_9434

The components that needed to be taken out to give room for new circuit designs:IMG_9435

The whole preamp circuit is revoiced and changed to get a tight and focused distortion that is very dynamic and versatile. You can play anything from metal, classic rock, broken up cleans and crisp clean just turning the two gain controls. The power amp is also revoiced and got dual punch controls which give you great control over the bottom end. Three electrolytic capacitors were swollen and are now replaced with capacitors with higher voltage rating and higher temperature rating.

Guitar straight into the amp.
TC G-major II in the loop for some delays.
Cab: Malmberg 4×12 with old Greenbacks.
Mics: Golden Age R1 mkIII, Tascam DR-40.

Please contact me if you want the same mod done to your Marshall JCM900 SL-X.

Carlsbro CS60 No. 2

Time for another Carlsbro CS60 project! I really like these amps since they have excellent transformers with high B+ which gives them a lot of power for a 2x EL34 amp.

IMG_7339IMG_7340 IMG_7341 IMG_7344This is what it looks like before the big transformation.

IMG_7360Getting rid of the old boards, tube sockets, cables and jacks.

IMG_8198 Making a ruff idea how the new boards will be fitted inside the amp.

IMG_8235Turrets in place on the boards.

IMG_8410 The preamp cathode resistor board.

IMG_8413 The power supply board.

IMG_8415 Bias section board with separate bias potentiometer so unmatched tubes can be used and easily be set up to draw the same amount of current.

IMG_8440And the preamp board along with the other boards.

IMG_8263A lot of holes drilled and potentiometers, switches, jacks etc. are mounted on the panels.

IMG_8573Fitting the boards inside the amp.

IMG_8637  It’s a lot more wiring with these point to point amps compared to amps built with PCB.

IMG_8774Final tweaks to make all frequency filters sound just as I want.

 

And here we have the finished result:Untitled-1Untitled-2Untitled-3Untitled-4

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It’s now a completely rebuilt amp with a new preamp, a new power amp, and a new power amp section. It’s a two-channel amp with a switchable gain boost for both channels, two switchable master volumes which all are switchable with both a regular footswitch and MIDI. This amp also has a Browner-switch for more compression and a tube buffered effects loop. The whole amp is soldered with lead-free Sn100C solder wire. Controls for each channel: gain, volume, treble, middle, bass and a three-way bright switch (dark-normal-bright).
Controls for the power amp: master volume 1, master volume 2, punch and presence.

 

The first test of the amp using my Greco EGF1000 Les Paul.

 

A full play through with my Hagström Swede.

 

A short video showing the dynamics on the distortion channel with the gain boost (extra tube stage) engaged, guitar straight into the amp. Just switches to the neck pickup (volume rolled back) to get the clean sound and using the bridge pickup (at full volume) to get this high gain sound.

Marshall JCM800 2205

Max Landegren from Billion Dollar Babies came by with his other JCM800 and wanted me to rebuild the distortion channel in it. I’ve modded his other JCM800 before and he asked me to make this amp more suited for soloing with a fatter sound with more compression and gain.

IMG_8486IMG_8447Stock JCM800 2205, not my favorite Marshall but soon it will be sounding like I want it to do.

IMG_8475 I made this small turret board for the distortion channel.

IMG_8481The new turret board for the distortion channel is in place and some changes are made to the power amp and power supply.

IMG_8488The faceplate in the upper right corner that makes all the difference 🙂

 

Here’s Max trying out the amp for the first time after the modification:

 

 

Selmer PA 100 No. 3

My third Selmer PA 100 rebuild!

Here it is in original shape:143

As I always do with these major PA rebuilds, I clean them completely from the old parts:56

Clean it from the old dirt:87

Point to point boards:9

Wiring around the power tube sockets:10

Cables for the boards:12

And components for the boards:13 14

And get the boards into the amp and try to remember where all cables where supposed to go:15 16

And here we have the finished result:1

1134 62597810

It’s a three channel amp with a tube buffered effects loop, dual switchable master volumes and a solo boost.

Control for each channel: gain, volume, treble, middle, bass. Channel two and three also has a tightness control. Channel two has a three way mid boost switch (low mid/normal/high mid) and channel three has a switchable solo boost that gives a push in the low end, a push in the mids at 600hz and flat out the highs.

Controls for the power amp: Dual master volumes, presence, punch and a three way range switch for the punch.

Here’s a clip of the amp:

 

Bonus clip of channel 2 and 3 before the amp was finished:

Sovtek MIG-50

I did a mod to this Sovtek MIG-50, changed the preamp circuit and made some minor changes to the power amp and the power supply.
Now it has a gain control and a master volume as well that works for both inputs. Input I: three gain stages. Input II: two gain stages.

IMG_7650 IMG_7651 IMG_7672 IMG_7673

Here it is at full gain using input I.

 

Another Selmer PA 100!

Time for another Selmer PA 100! This amp was as most old British PA’s from the 60s and 70s an all tube amp with excellent transformers. Therefor they are a great platform for guitar projects and a bonus is that there’s room for a lot of controls on the big front panels. It has now become a two channel guitar amp with dual footswitchable master volumes and a tube buffered effects loop.

Here it is in original shape:13487828_1211553312222021_366885353_n13487707_1212763048767714_34312673_n13521803_1212763398767679_1500853209_n13521631_1212763462101006_2105691400_n

Taking out the old point to point board to make room for new ones. 13492859_1212905925420093_129115339_n

These amps are more than often filled with 40 year old dust and dirt.13514339_1214488181928534_102069746_n

So I prefer to clean them before working in them 🙂13493053_1212907305419955_1050315758_n 13510445_1212907625419923_882744814_n 13515163_1214488718595147_255453481_n 13530257_1214488781928474_331365642_n

New turret boards made for this amp:dsc_0662-kopia

And here they are populated with components and cables:14409209_1289953117715373_3153470_n

Installing the boards inside the amp:14518812_1297949446915740_1355651757_n

And here’s the finished result:9 1 2 3 4 5 6 7 8

It’s now a totally rebuilt amp with a new preamp, new power amp and new power supply section. It has two independent channels with gain, tightness, bass, middle, treble and volume. The mastersection has presence, punch and two switchable master volumes as well as a tube buffered loop.

Here’s a clip of it:

Sound City 120R PA

My latest project is this Sound City PA 120R which had a solid state preamp and a tube power amp section. It was a good platform with it’s big transfromers and room for a lot of controls and functions on the big front panel. It has now become a four channel amp, all tube of course with a footswitchable gain boost (extra tube stage) for each channel and dual footswitchable master volumes. So it has eight footswitchable sounds which can all get a volume boost for solos. Other features are tube buffered effects loop and bias potentiometers and test point jacks for each of the six EL34’s on the back panel.

Here it is in original shape:DSC_0603DSC_0604DSC_0605DSC_0607DSC_0608

Here you can see the guts of the amp before I did my work in it:DSC_0609DSC_0610

I took out all parts except for the good old transformers and the tube sockets + impedance and voltage switches:DSC_0611DSC_0612

Making turret boards:DSC_0605 (2)DSC_0614

All cables attached to the turret boards:IMG_5981

Turret boards populated with components which makes it a totally different amp:DSC_0554DSC_0553DSC_0552DSC_0555

Preparing the amp to receive the turret boards:DSC_0553 (3)

And attaching all the cables where they are supose to be:IMG_6027IMG_6095

And here we have the finished result:DSC_0663aDSC_0698aDSC_0696aDSC_0659DSC_0694aDSC_0708DSC_0722DSC_0731aDSC_0733aDSC_0783DSC_0757aDSC_0769aControls for each of the four channels: gain, three way mid boost switch, bass, middle, treble and volume + a footswitchable gain boost.

Controls for the power amp: dual footswitchable master volumes, presence and punch both with a three way range switch to match the amp to different cabinets.

 

Simms-watts PA 100

It’s time for another Simms!

242 (1)I really like the big transformers in these amps.

6Here’s the guts from the original PA circuit.

4 (1)

6 (1)Out with the old and in with the new.

DSC_0485Making new turret boards.

DSC_0502bTurret boards filled with NOS Mustard Capacitors and Iskra resistors along with some new components.

2dfInstalling the new circuits in the amp.

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Here’s the finished result:DSC_0535aDSC_0538aDSC_0561aDSC_0548aDSC_0580aDSC_0575aDSC_0594aDSC_0588a

 

dfdfd - Kopia

It has two channels with gain, volume, treble, middle, bass and a three way gain structure switch. Channel 2 also has a tightness control and a growl control. The controls for the power amp is master volume, presence, punch and deep.

 

 

Re-amping with In Mourning

Some pics and a clip from the re-amping session I did with In Mourning. I’m honored that they want to use my amps for their new album.12471443_1675908572649155_6987028480564561240_o

s

The amp is a totally rebuilt Laney PA 100 with four channels, the cab is a Malmberg with Celestion Greenbacks. Mics in front of the cab is a Golden Age R1 MK3 Active and a Shure SM57.

Check them out:
http://www.inmourning.net/
https://www.facebook.com/inmourningband

Selmer PA 100

My latest project is this Selmer PA 100! It will be a three channel amp with a footswitchable gain boost that kicks in an extra gain stage on each channel. It will have a tube buffered loop and a lot of voicing options and as always it will be built point to point using NOS mustard caps and Iskra resistors 🙂IMG_5407IMG_5408 IMG_5410 IMG_5412

 

IMG_5448 IMG_5466 Giving a new finish to the front panel.IMG_5478 Cleaning it from the old board and make room for new ones.

IMG_5471Renovating the old switches.

IMG_5467 IMG_5479 New turret boards are done.

IMG_5523Installing new potentiometers and switches.

IMG_5548 IMG_5549 The boards are ready to be installed!IMG_5616 IMG_5610Just need to remember where all the houndred cables are suposed to go 🙂

 

Here is the finished result:DSC_0527bDSC_0399aDSC_0452bDSC_0409aDSC_0449aDSC_0413bDSC_0514aDSC_0393c DSC_0518aDSC_0522a

 

 

Here are some clips:

First test of the amp using my Hagström Swede.

Showing some metal sounds. Guitar straight into the amp, nothing in the loop.

Overall demo of the amp using my Greco EGF-1000. I’m running a TC G-major 2 in the loop for some delays. The cab is a Malmberg 4×12 with Celestion Greenbacks

 

 

 

Marshall JCM 800 1959

IMG_5576I’ve installed a tube buffered loop and modified this Marshall JCM 800 1959. It’s a smaller mod since the main PCB is still there and the power amp is almost untouched, but the change in tone, gain, dynamic response and feeling is huge!

IMG_5556Before mod. You can see that someone has installed a master volume, and it has been modded with an extra preamp tube at some point before but is restored to stock.

IMG_5575After mod. Effects loop installed and the preamp is changed pretty much along with some minor changes in the power amp and the power supply. I’m using shielded cable for the signal to avoid hiss and noise.IMG_5574

I’m playing a Greco EGF 1000 with Seymour duncan JB + 59 straight into the amp and running a G major II in the loop for some delays. The cab is a Malmberg 4×12 with old Celestion Greenbacks.

 

Bonus clip when Max tries out the amp.

 

Peavey VTM120

I got this Peavey VTM 120 on my bench. It failed during a concert and started to smoke. I opened it up and found burnt plastic thatwas caused by a shorting electrolytic cap. I changed the burnt resistor, the power tubes and all the electrolytic caps in the power supply and now it’s up and running again!

IMG_5424IMG_5388IMG_5389IMG_5390 IMG_5421

Ribbon mic shootout

Me and a good friend of mine were both looking for a good ribbon mic for guitar, so we decided to do a ribbon mic shootout. We lent a couple of mics and got started.

We recorded a backround track with drums and bass first. Then I recorded a guitar track that we re-amped through my amp and mic’d it with different ribbon mics at the exact same spot, about 15 cm (6″) from the grill cloth on my Malmberg cab. You can listen to the guitar track for each mic or in a mix with drums and bass.

DSC_1323I played through this amp which is my modded Laney PA 100, running a TC G-major in the loop and through my Malmberg cab with old Celestion Greenbacks.

DSC_1327Used this Greco EGF-1000 with Seymour Duncan JB and 59.

DSC_1328Here is the monster bass amplifier!

DSC_1330Recording drums and bass.

 

Arty-1 by Arthur FisherDSC_1338

Beyer M160DSC_1340

Coles 4038DSC_1345

Golden Age R1 MkIIDSC_1334

Golden Age R1 MkIII ActiveDSC_1335

Golden Age R1 Tube ActiveDSC_1336

Golden Age R2DSC_1333

Sontronics DeltaDSC_1337

Sontronics SigmaDSC_1339

Reference mic: Shure sm57DSC_1341

A big thanks to:

Erik Nerback who helpt with the recording and mix.

Johan Nordin who lent us Coles 4038 and Beyer M160.

Stefan Krooks at Stomp studios who lent us the Sontronics mics.

Golden Age Music who lent us all the Golden Age mics.

Gammalthea who lent us Arty-1.

Carlsbro CS60

Here is my latest project!IMG_4306 IMG_4308IMG_4310 It’s a Carlsbro CS60.

Here is what it looks like on the inside:IMG_4311 IMG_4313 IMG_4418IMG_4421

 

Now I have emptied the amp from the old circuit boards and made room for new circuits.IMG_4673IMG_4575This amp will be built on turret boards!

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Here are the turret boards filled with new components. I’ve come up with some new ideas to get more growl out of the distortion and still make it insanely tight. IMG_4724

And here is the finished result:DSC_0645DSC_0617bDSC_0630bDSC_0642 DSC_0636bDSC_0659bDSC_0624bDSC_0649DSC_0654b

It’s a two channel amp with a tube buffered effects loop. Channel one is a crispy clean channel with shimmering highs, channel two is a super tight heavy distortion channel with a lot of growl and punch!

 

Here are some clips of the amp:

 

Marshall 4210 update

Finally I got a chance to take some pics and record a new clip of this beautiful amp!

Here it is finished in an old sugar box:

DSC_0175 - KopiaIMG_4651 IMG_4652 IMG_4654 IMG_4669

 

 

And of course a clip with the new tweaks:

I’m playing a Greco EGF 1000 with Seymour Duncan JB & 59 pickups straight into the amp. I have a TC G major 2 in the loop for some delays.

Cabs: Malmberg 4×12 with Greenbacks and a homemade 2×12 with V30.

Sound recorded with a Tascam iM2X.

Fender Combos

I got two Fender amps in for service, these amps belong to the band Top Cats. Both amps have recived new power tubes and bias adjustment and the Fender Blues Deluxe had a non working reverb.

IMG_4461

I found out that one of the hair-thin wires from one of the coils inside the reverb tank was broken and I was able to splice it using wire that I use for winding guitar pickups.

IMG_4459  IMG_4462IMG_4460

Klemt Echolette BS40

Here is a nice old Klemt Echolette BS40!

IMG_4415 IMG_4427  IMG_4431I’ve had this amp on my bench before and done a re-cap but now I will install a tube buffered effects loop and a master volume.

IMG_4434I’ve drilled a hole for the extra tube.

IMG_4448 Here is the new tube in it’s socket.

IMG_4452 I”ve installed two small boards with the circuit for the effects loop.

IMG_4436

IMG_4453The send-, return-jack and master volume are placed on the back panel.

 

Marshall JCM 800 4211

Here we have a Marshall JCM 800 4211!IMG_4220 IMG_4221Since it’s a 100w combo amp from the start the labeling on the panels are upside down, otherwise it’s very similar to the head version of the amp.

IMG_4222Here’s the inside of the amp with the original PCB where all the potentiometers are mounted directly to the PCB and holding it in the air.IMG_4226The PCB is now gone and the amp is ready to become something else!IMG_4258I’ve installed some new boards and build up a new preamp, a new power amp and a new power supply. IMG_4298Most of the preamp is in place as well as the power supply. All the four power tubes has a 1 ohm resistor between the cathode and ground for easy bias measurement. I’ve installed two bias potentiometers so it’s possible to use two pairs of EL34’s that have different matching.

It will be a two channel amp with a footswitchable tube buffered parallel loop. Channel one will be a crunch channel with a lot of dynamic and attack and a nice “roar”, channel two will be a beefy metal channel with tons of gain and super tight attack. The metal channel has a three-way-switch on the back panel that sets different types of gain structures, with the switch set to left it increase more growl to the distortion and the right position it makes the sound really angry and makes the distortion even tighter. I’ve come up with some new ideas for this amp to get more punch and growl in the distortion and still keep it tight.

Pics of the final result and soundclips are coming soon.

 

More repairs!

IMG_4292I got this Marshall 2203 on my bench that wasn’t working.

I opened it up and found this:IMG_4238The cables from the power transformer to the heater filament was melted together! IMG_4240Fortunately the transformer was ok.

IMG_4289I was able to splice the cables from the transformer with new fresh cables.

IMG_4290I replaced the 30+ years old filter caps as well with new ones and now the amp is working fine.

Marshall 2203

Here’s a beaten up Marshall 2203! It has been modified several times before and has now landed on my bench. The owner wants me to put in a tube buffered effects loop and tweak the two channels to my liking. So it’s a much smaller mod than I usually do even if the sound improvements are big 🙂

IMG_4201 IMG_4202 The main PCB is still in place but someone before me has installed a clean channel.

IMG_4205It doesn’t look too aesthetically appealing if you ask me 🙂

IMG_4210Here is the new loop. The main PCB is still there and I’ve modified the existing circuit of the preamp and power amp on the PCB.

This is how it sounds after my mod (recorded with an iPhone 4S):

I’ve improved the dynamics a lot, you can go from crystal clear to screaming higain with the volume on the guitar. The distortion channel has more gain and attack and is much more focused than before and the whole amp has a beefier bottom end. The clean channel is crispier and warmer than before.

 

Sound City 50 mark 3

Here we have a Sound City mark 3!IMG_3045A good looking amp if you ask me.

IMG_3046IMG_3047Big old Partridge transformers.

IMG_3051IMG_3050Here is the old point to point wiring.

IMG_4074The old circuit is long gone 🙂

IMG_4083Preparing some wiring and installing relays for the switching functions.

IMG_4086IMG_4135Most of the preamp is now installed, just the loop, phase inverter and some wiring left before the start up.

And here is the final result:1a 1b23b45678109Some really nice xf2 tubes in this amp.

Here is a layout for the front panel:Layout

It’s a two channel amp with a foot switchable gain boost for both channels and two foot switchable master volumes. So it’s four different sounds which can all have a volume boost for soloing.

Here’s a clip so you can hear how it sounds:

 

Repairs

 

I’ve started the year by doing some repair jobs.

IMG_4063Here is a Hagström 39.

IMG_3997Here you can see the circuit board with all the old electrolytic caps that have dried out over the years. The amp had a big hum going on and was unstable.

IMG_3999It had some really ugly solder joints as well.

IMG_4002Now it has new filter caps for the power supply.

IMG_4003All the electrolytic caps in the amp is now changed to new ones and the circuit around the phase inverter is changed to make it more stable. Thanks to Bo Hansén for the tips regarding the phase inverter!

 

The other amp I’ve done some repairs to is this Marshall 1987x that had a bad power transformer:IMG_4067

IMG_4040Here is the old transformer who seems to have an internal short circuit and therefor eats fuses.

IMG_4043The new transformer has some more iron than the old one, just the way I like it 🙂

IMG_4057Here is the new transformer in place!

IMG_4058I like to twist the cables from the power transformer to reduce hum.

Marshall 1992 – Finished!

Now the Marshall is finished!DSC_0721fixaThe new logo is in place!

DSC_0706 The new preamp-section is in place. The bias section is new as well and has two bias pots instead of one.

DSC_0708fix DSC_0716fix DSC_0717 I’ve changed my signatur since 2012 🙂

The amp is much more versatile now, it has two footswitchable channels, both with a footswitchable gain boost, the control for each channel is: gain, volume, bass, middle, treble and a three-way bright-switch. The punch- and presence-controls are push-pull for different ranges. It has a tube buffered effects loop as well.

Here is a clip of the first test in the rehearsal studio, it’s recorded with an iPhone 4S:

I will  record some more clips of it.

Marshall 1992 – new mod

 

 

VLUU L210  / Samsung L210Next project is this Marshall 1992 that I modded in February 2012. I will rebuild the preamp in this amp and install two new channels with a footswitchable gain boost for each channel. It will get less modern sounding even if the new channels will have some bite to them as well 🙂2 This is how it looks like with the old mod.

4And here it is without the old preamp.

This is what it sounded like with the old mod:

To be continued…

 

Simms-Watts PA no.3

Time for another Simms-Watts PA 100! IMG_1971

IMG_1969IMG_1982 IMG_1972

This is what it looks like in original shape. A technician have opened it up before for servicing but no major changes has been done.IMG_3318And here it is cleaned from the old parts.

IMG_3351aI’ve installed some new boards to build up the new preamp, power amp and new power supply circuit on. I’ve installed three extra preamp tubes as well since this will become a tre channel amp that will have a lot of distortion available.

IMG_3359 Here we have the new power supply section.

IMG_3610And the first parts of the preamp.

And here is the final result: DSC_0565 - Kopia (2)DSC_0582

DSC_0539 - Kopia DSC_0545 DSC_0546 DSC_0549 DSC_0555It’s a three channel amp where the three footswitchable channels are totally independent and have their own: gain, volume, bass, middle, treble, three-way-bright switch and a gain boost switch. The power amp has two footswitchable master volumes, a presence- and punch-control who both have a 3-way range switch for matching the sound to different cabs. And of course it has a tube buffered effects loop. With a B+ of 610VDC it delivers way more than 100 watt from the four EL34.

Here is the first test in my rehearsalstudio, it’s recorded with an iPhone 4S:

I’m using my Greco EGF1000 Les Paul with Seymour duncan JB and 59. Guitar straight into the amp. I’m running a TC G-major 2 in the loop for some delays. There’s a high pitch noise that my pickups picks up in this room when I split the mics to single coil, it’s not coming from the amp.

I will record some more clips soon!

Hermansson Amplification is up and running!

Finally I have started up a company! I’m exited about the future and I will do my best to keep building unique tube amps with the best possible attack, response and dynamics.

I will keep my trusty metcal soldering iron running hot and keep you guys updated! 🙂

Here is my new logo:

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Big thanks to my friend Lina who helped me with the logo! Please check out her site.

Cutting out the treble cone

I have a two Celestion G12H-100 from 1984. I have the ones with the dubble cone wich makes them very bright. I liked them for clean sounds but for distorted tones they where way too bright for my taste. I liked the bottom end and the balanced mids in them but there was too much treble from the tweeter cone so I cut it out 🙂

2The speaker looks like this with it’s big “H”-magnet.

IMG_2978I started to cut out the dust cap from the treble cone.

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I taped the centrum hole to protect the coil from dust.

IMG_2981I cutted out the treble cone with a small scissor.

IMG_2982And the treble cone is gone 🙂

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I took the old dust cap and resize it to fit the smaller hole and glued it with fabric glue. I can highly recommend fabric glue for repairing holes in a speaker cone as well. It works perfect for that!

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IMG_2989And then put the dust cap upside down to the cone to make it fit properly.

IMG_2988And here is the result! The speakers works perfectly and still have the nice bottom end and the well balanced mids but now with a perfect amount of treble 🙂

Here is a sound clip of the speakers after the mod, they are fitted in a home made 2×12 cab and are miced with a single Shure SM57. The amp is my four channel Laney PA 100.

 

 

 

 

 

 

 

 

 

Another Carlsbro TC 60

I’ve rebuilt another Carlsbro TC 60. Here are some pics of it before I put the knife in it:

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Time to clean it from the old components and fill it with new circuits:

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And here we have the finished result:

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Here is a layout for the front panel:

Layout

 

This is now a two channel amp with footswitchable gain boost for both channels and two footswitchable master volumes. So this amp has four different sounds, all at two volumes so you can play solos on each of the four sounds. The amp has a tube buffered effects loop as well.

And here are some clips:

 

 

Hiwatt PA 100 back for some tweaks!

DSC_4044This Hiwatt PA 100 that I modded a couple of years ago is back on my bench for some tweaks. I’ve rebuilt the clean channel completely and installed a gainboost. All the other channels have more gain and the whole amp has more low end.

Here is a clip after the tweaks:

 

It can handle some Van Halen brown sounds as well 🙂

 

The monster is finished!

I’m finally finished with the Carlsbro PA 100!

Here are some pics of the result:DSC_1137DSC_1119 DSC_1124 DSC_1125 DSC_1126 DSC_1128 DSC_1129 DSC_1134 DSC_1135

Bias trim pots on the back panel for easy bias adjustment.

 

Here is a layout pic for the front panel:

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This is a very flexible amp with it’s three independent channels with a lot of shaping features on each channel. It has a gain boost that kicks in another gain stage that can be assigned to any of the three channels. The power amp section has some tone shaping features as well; a presence, a punch and a bass boost- control, all with their own three way switch for different frequency responses. So you are really able to set up this amp to work and sound the way you want with any guitar and any cab.

Here are some clips:

Carlsbro PA 60

Here we have a 5 Channel Carlsbro PA head!IMG_2440 IMG_2441

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The transformers was like the leaning tower of pisa when I got the amp but they worked just as they should.

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Looks similar inside to the other Carlsbro’s I’ve had my nose in.

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Time to clean it from the old components!

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Removed the transformers and bent the mounting brackets so they stand up straight again.

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New boards installed to build up the new circuits on.

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Fitted new alpha pots for the whole amp.

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And here we have the finished amp! The guy in Spain who owns the amp wanted cream chicken heads exept for the volume-controls therefor it’s a mix of black and cream chicken heads 🙂

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Now it’s a two channel amp with a footswitchable gain boost for each channel, two footswitchable master volumes and a tube buffered effects loop.DSC_1585 DSC_1586

The power supply.

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Here is an explanation that tells what all knobs and switches does.

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1. Bright switch – left: dark/ middle: medium/ right: bright – Clean channel
2. Treble – Clean channel
3. Bright switch – left: dark/ middle: medium/ right: bright – Gain channel
4. Treble – Gain channel
5. Punch shift – Changes the frequency the punch-control operates in
6. Presence shift – Changes the frequency the presence-control operates in
7. Volume – Clean channel
8. Middle – Clean channel
9. Volume – Gain channel
10. Middle – Gain channel
11. Punch
12. Presence
13. Gain boost control – Clean channel
14. Bass – Clean channel
15. Gain boost control – Gain channel
16. Bass – Gain channel
17. Master volume 1
18. Master volume 2
19. Input
20. Gain – Clean channel
21. Gain switch – left: bright gain/ middle: low gain/ right: fat gain
22. Gain – Gain channel
23. Modern – This is a control who adds bottom and top end, so in higher settings it makes the sound more “modern”
24. Channel switch
25. Master volume switch
26. Gain boost switch

 

This clip is recorded with a Golden Age R3 Active.

Guitar: Greco EGF1000 with a Seymour Duncan JB in the bridge and a Seymour Duncan 59 in the neck.

Cab: Malmberg 4×12 with Celestion Greenbacks from 1970/1973.

 

This clip is recorded with an iPhone 4S using the same guitar and cab.

 

 

Carlsbro PA 100

I’m starting the new year with a total remake in a Carlsbro PA 100.

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This is a HUGE amp!

And as always I will clean it from the old parts and fit in some new circuits!

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IMG_2279IMG_2280 IMG_2392Unfortunately the mains transformer was burnt on this one but I was able to find a original Partridge transformer from another Carlsbro PA 100.

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IMG_2388 IMG_2431 IMG_2433 I’m testing out some new ideas which makes it possible to set the bias individually for each power tube from the back panel of the amp without taking it out from the shell. I will also install test points for the bias so it’s measurable from the back panel.

 

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The back panel got some new holes 🙂

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An extra preamp tube is fitted and the power supply is in place. The red board is a MIDI-board, yes this is going to be a MIDI-project 🙂

This amp is going to be a big project with three channels with separate Gain, Volume, Treble, Middle, Bass, Bright-switch, channel 2 and 3 will have a tightness control. The amp will have a gain boost that could be assignable to any channel, a tube buffered effects loop, two master volumes and a mute function, all of them will be assignable from the front panel, via footswitch and via MIDI. The power amp will also have some tone shaping controls.

To be continued…

 

 

Mesa Triple Rectifier No: 2

I’ve have had a Mesa on my bench again.

The plan was to tighten up channel 2 and 3 so they became more focused and less boomy, to get rid of some background noise (which comes from bad layout) and make the clean channel crispier and more open sounding.

 

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This time I have recorded a “before and after mod”-clip:

I was using the same settings for both channels:

Gain: 3 o’clock,

Volume: 9 o’clock

Precence: 12 o’clock

Treble: 12 o’clock

Middle: 12 o’clock

Bass: 12 o’clock

Voice switch was set to: Modern.

I was playing my Greco EGF 1000 with a Seymour Duncan JB in the bridge and a Seymour Duncan 59 in the neck, straight into the amp. It was recorded with a Shure SM57 in front of my Malmberg 4×12 with old Celestion Greenbacks.

Here is a video with all channels:

I’m playing on my Hagström Swede with a Seymour Duncan JB in the bridge and the stock neck pickup. I used a TC G-major in the loop for some delays for the clean channel. It’s recorded with a Shure SM57 and a Sontronics Delta.

The Carlsbro is finished!

The Carlsbro is finished!

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It’s a two channel amp with two footswichable master volumes. The two channels have separate gain, volume, treble, middle, bass and a three way bright switch. The amp has two EL34’s in the poweramp, a presence and a punch control.

Carlsbron är nu färdig! Det är en tvåkanalsförstärkare med två footswitchbara mastervolymer. Varje kanal har gain, volym, treble, middle, bass och en treläges brightswitch. I slutsteget sitter det två EL34’or och en presence- och punch-kontroll.