Bill Meara ) writes:
I have an old Heath SG-6 signal generator. It uses two triodes.
I'd like to convert it to solid state. The switched coils, varible cap
and dial mechanism are very nice. Any suggestions on what kind of
oscillator circuit I should use? I imagine the difficult part will
be coming up with a feedback circuit that will cover the 160 kHz to 50 Mhz.
Any ideas? Has anyone seen any articles on this kind of conversion?
By going solid state and adding a few buffer stages I'm hoping I could make
this thing a lot more stable. 73 Bill M0HBR CU2JL N2CQR
http://planeta.clix.pt/n2cqr

As Leon said, you should be able to change the triode to an FET, with
minimal change. In other words, leave the oscillator as it is, and
merely change biasing.

I once took a Collins PTO, bought at a hamfest for $2.50, took out the
tube and wired in an FET across the tube socket. Obviously, I reduced
the "B+" to around 12V or so. I can't remember if I even had to change
the plate resistor (there might not have been one, but instead an RFC).

Michael VE2BVW