Whell I had luck to find a rare mixing desk from Austrian company WSW.
In the desk there were a lot modules looking like army comunication modules or something..so i could not take a deks ..but I got modules...couse desk will be museum exponat
with a little help of some ppl around the world
and info WSW web site http://www.wsw.cz/index1.htm
I realize that I have germanium microphone preamp so I decided to keep it and do cleaning, restauration ....
I have module 811-481... and I found this schematics of 811-483 mic preamp
so after a a night checking all...I realise this is earliest version of discrete WSW preamp based on AC 151r germanium transistors and OA85 germanium Diodes
im no expert in this field
so after a lot restauration I did I decided to recap module with panasonic FM Caps and replace resistors with new one
(I heard some older from early 60s are noisy) anyway no big job cca 20 resistors to replace..cant do any harm!!!
here is picture of module before I started cleaning and restauration
In the desk there were a lot modules looking like army comunication modules or something..so i could not take a deks ..but I got modules...couse desk will be museum exponat
with a little help of some ppl around the world
and info WSW web site http://www.wsw.cz/index1.htm
I realize that I have germanium microphone preamp so I decided to keep it and do cleaning, restauration ....
I have module 811-481... and I found this schematics of 811-483 mic preamp
so after a a night checking all...I realise this is earliest version of discrete WSW preamp based on AC 151r germanium transistors and OA85 germanium Diodes
im no expert in this field
so after a lot restauration I did I decided to recap module with panasonic FM Caps and replace resistors with new one
(I heard some older from early 60s are noisy) anyway no big job cca 20 resistors to replace..cant do any harm!!!
here is picture of module before I started cleaning and restauration