"frank" wrote in message
...
Hello Colin,

COLIN LAMB wrote:
Hello Frank:

The push-pull output transformers should be fairly common
and easy to
obtain. Antique Electronic Supply, in USA, is a good
source. As I recall,
the output tubes are 6V6s, so that would use a common
transformer as
well as driver transformer.

actually the output tubes and the driver are all 6F6. Also
the output
audio impedance of the SP-200 series is 600 ohms, I
wouldn't mind too
much to have directly an output impedance for driving a
4-8 ohm
speaker, but my first option would be restoring the set as
much as
possible close to the original. I'd be happy to find any
information
about the transformers, like power, turn ratios and so on.

Best 73 es HNY

Frank IZ8DWF

The 6F6 tubes are connected as triodes and operated
nearly at Class-B, the output transformer is 10,000 plate to
plate. This is a common impedance. The original transformers
have a 500 ohm main output and a loosly coupled 8,000 ohm
winding for the headphones.


--
Richard Knoppow
Los Angeles
WB6KBL