I haven't tested the impedance yet, need to find a pot, but I noticed
that the two 6F6es are connected as push pull triodes. I wonder why
they didn't use a pair of 45s?
Hank
"Scott Dorsey" wrote in message
...
Henry Kolesnik wrote:
Getting old is not recalling the alternatives offered, so I'm a dummy.
I
found the filament xfmr first and tried it but it reduced volume so I
assume my radio which is non-military doesn't have 600 ohms like the
military manual I have. So I guess mine is commercial, either a
SP-200-SX or more likely a SP-210-SX and I think it has a 3.2 ohm
output transformer.
I can't find any info and I wonder if anyone knows for sure on the
commercial models output transformer's impedance.

What is the DC resistance across the output?

If you want to know FOR SURE, put the output on a scope with a 1K pot
in
parallel with it... tune to interchannel noise, and note the location
of
the peaks on the scope. Crank the pot up until the level is exactly
half
of what it was, then measure the value of the pot.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."