Hermansson Amplification
Active member
I have slaughtered another Marshall! 
It's a Marshall JCM 800 4211!
Since 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.
Here’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.
The PCB is now gone and the amp is ready to become something else!
I’ve installed some new boards and build up a new preamp, a new power amp and a new power supply.
Here is the final result:
It's a two channel amp with a footswitchable tube buffered parallel loop. Channel one is a crunch channel with a lot of dynamic, attack and a nice ”roar”, channel two turns the amp to a metal monster 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
Here are some clips:
I'm playing my Hagström Swede from 1975 straight into the amp.
Clips are recorded with a Tascam iM2X (a stereo mic that is connected to my iPhone).
It's a Marshall JCM 800 4211!
Since 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.
Here’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.
The PCB is now gone and the amp is ready to become something else!
I’ve installed some new boards and build up a new preamp, a new power amp and a new power supply.
Here is the final result:
It's a two channel amp with a footswitchable tube buffered parallel loop. Channel one is a crunch channel with a lot of dynamic, attack and a nice ”roar”, channel two turns the amp to a metal monster 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
Here are some clips:
I'm playing my Hagström Swede from 1975 straight into the amp.
Clips are recorded with a Tascam iM2X (a stereo mic that is connected to my iPhone).
For the win 
