"James Sweet" wrote in message
news:Leu5d.1139$ku4.699@trnddc01...

"Norm Dresner" wrote in message
...

As a semi-final coda to this saga, I've ordered a set of three [one
spare]
6SH7 tubes and I'm actively looking for a good source for the 6AV5GTs as
well. I'm also looking to pick up on eBay a non-working HP 33x
distortion
analyzer or similar oscillator from which to scrounge the dual tuning
capacitors so I can make a solid state low-distortion instrument as
well.

I'll also look into replacing the electrolytic capacitors.

Thanks for all of your help and suggestions

Norm


Is there any reason you couldn't gang together a pair of ordinary variable
capacitors using a gear or belt system? You could probably get away with
some cord as used in tuning dials on old analog tuned radios too.



I could also do the same thing with a pair of pots. The advantage of the
dual caps from a factory-built oscillator is that the hard mechanical work
is all done -- and they're presumably matched well enough. It's simply less
work. BTW, it's a lot easier to get 10-turn pots than even one-turn
capacitors these days..

Norm