hey folks! workin on this:
just tore into an old Palo Alto version of this classic oscillator.
It puts out more voltage than most transistor generators, especially at 600 kc.
who knows how many pirate radio stations were started with this anchor?
made from 1952 to 1980 something.
one of the longest vac tube product runs, it has to be.
this is the point to point version with the octal 6SH7 (metal) and 6AV5 tubes.
I was wondering if i could swap out the 6SH7 for an 6SG7?
they both have almost identical specs in the tube manual, same base, same everything.
since i have a ton of the SG, which would make the all important tube matching go easier, otherwise i have to order a couple of sh from Antique and hope that they match.
OK, thanks!
just a few notes, check out the 10M resistor across the coupling caps.
Is this to make the leakage due to aging (both my caps were leaky) less of a factor?
also, look close at the transformer output.
there is some clever switching going on.
that is really T1 and T2, two seperate transformers, one big one for low freqs, and one ouncer type for the rf.
pretty slick, might have some applicatins in audio?
also note the weird air core chokes hanging off the plates of the 6SH7.
transformer switching:
just tore into an old Palo Alto version of this classic oscillator.
It puts out more voltage than most transistor generators, especially at 600 kc.
who knows how many pirate radio stations were started with this anchor?
made from 1952 to 1980 something.
one of the longest vac tube product runs, it has to be.
this is the point to point version with the octal 6SH7 (metal) and 6AV5 tubes.
I was wondering if i could swap out the 6SH7 for an 6SG7?
they both have almost identical specs in the tube manual, same base, same everything.
since i have a ton of the SG, which would make the all important tube matching go easier, otherwise i have to order a couple of sh from Antique and hope that they match.
OK, thanks!
just a few notes, check out the 10M resistor across the coupling caps.
Is this to make the leakage due to aging (both my caps were leaky) less of a factor?
also, look close at the transformer output.
there is some clever switching going on.
that is really T1 and T2, two seperate transformers, one big one for low freqs, and one ouncer type for the rf.
pretty slick, might have some applicatins in audio?
also note the weird air core chokes hanging off the plates of the 6SH7.
transformer switching: