Hermansson Amplification
Active member
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.
This is what it looks like before the big transformation.
Getting rid of the old boards, tube sockets, cables and jacks.
Making a ruff idea how the new boards will be fitted inside the amp.
Turrets in place on the boards.
The preamp cathode resistor board.
The power supply board.
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.
And the preamp board along with the other boards.
A lot of holes drilled and potentiometers, switches, jacks etc. are mounted on the panels.
Fitting the boards inside the amp.
It’s a lot more wiring with these point to point amps compared to amps built with PCB.
Final tweaks to make all frequency filters sound just as I want.
And here we have the finished result:
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.
This is what it looks like before the big transformation.
Getting rid of the old boards, tube sockets, cables and jacks.
Making a ruff idea how the new boards will be fitted inside the amp.
Turrets in place on the boards.
The preamp cathode resistor board.
The power supply board.
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.
And the preamp board along with the other boards.
A lot of holes drilled and potentiometers, switches, jacks etc. are mounted on the panels.
Fitting the boards inside the amp.
It’s a lot more wiring with these point to point amps compared to amps built with PCB.
Final tweaks to make all frequency filters sound just as I want.
And here we have the finished result:
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.
