as buddy Karl is very busy at work so he doesn't have time enough at the moment to complete a few things on our projects (see Surrounded by Clones) I took my 1980 Supertwin (RM) I've bought last year. The reverb tank was missing and the sound didn't make me happy either.
This is how it looked after total surgery:
I definitely wanted to use existing material like the NOS PT N50/1 (Engel) from the Sixties and the OT N503S (Socora/Radio Bourse) - a left-over from a 2x 6W amplificateur I made in 1963.
As schematic I used parts of the AC30 TB (NORMAL & BRILLIANT w/o VIB/TREM) feeding a EL84. To get the soft-start of a tube rectifier (EZ80) despite the fact the PT has only 1x 250V I added two 1N4007 to get a bridge-rectifier. Works perfect!
The original chassis has been supplemented with an aluminum profile bar so I had room for the tubes (ECC83 - ECC83 - EL84 - EZ80).
All pots have the same function except Reverb VOL which became the NORMAL volume.
The power supply will be changed a bit - I'm waiting for parts.
Tomorrow I start with the wiring between the socket and the tagboard. There isn't much room so this will be a real challenge (for eyes & hands)!
Mod edit: Fixed image links
Cheers
Claus
