gullaz
Active Member
I acquired this some time ago, seller described it as "powers up but no sound". No wonder as the 33k 10w resistor
after the rectifiers was open. With my poor knowledge and skills I started the restoration.
New power resistor, new caps on the bias supply, and the first 40/80 can capacitor which was totally gone.
There is still a lot to do (first thing will be raplacing the selenium rectifier with silicon and the power tubes coupling capacitors) so I am not attempting to use it yet.
One thing that puzzles me is that after the rectifiers I measure only 405 volts dc instead of the 435 reported in Sam's schematics: I was thinking either weak 5u4gb rectifiers or (wouldn't be the first time) a mistake in Sam's sheet?
If any 260 owner read this I'd like to know what his/her B+ is.
after the rectifiers was open. With my poor knowledge and skills I started the restoration.
New power resistor, new caps on the bias supply, and the first 40/80 can capacitor which was totally gone.
There is still a lot to do (first thing will be raplacing the selenium rectifier with silicon and the power tubes coupling capacitors) so I am not attempting to use it yet.
One thing that puzzles me is that after the rectifiers I measure only 405 volts dc instead of the 435 reported in Sam's schematics: I was thinking either weak 5u4gb rectifiers or (wouldn't be the first time) a mistake in Sam's sheet?
If any 260 owner read this I'd like to know what his/her B+ is.