Hello Everyone,

I have picked up an Advance J1B audio generator at a garage sale that
someone has attempted to repair previously.
There is a tube missing, there are a number of wires cut, and there are
burned resistors.

I wonder if anyone could help me out with schematics.

The generator is a tube based Wien-bridge circuit with a dual gang capacitor
tuning. Interestingly, there is no bulb based stabilizer circuit, like in a
HP generator. There are three frequency ranges from 15Hz to 150KHz, and it
looks like that amplitude feed-back is also switched with the range. The
generator has 5ohm and 600ohm outputs.
The tube complement is an EC90, ECC88 (6DJ8), EZ81, and an EL84 (6BQ5)
missing according to the scribbling on the panel. I only have 6GK6, which
should be equivalent to the 6BQ5, except for pinout.
I would like to bring back the generator to life as the reduction gear and
the scale seems to be decent quality.

Thanks, Peter

"Peter Orban" wrote in message
...

I have picked up an Advance J1B audio generator at a garage sale that
someone has attempted to repair previously.

Advance was a very good quality English brand favored by servicemen. I still
have an RF generator which is flat over all bands.