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Old 26th November 2015, 05:15 PM   #1
Ggizzy is offline Ggizzy  United States
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Default Germanium output driver transformer use

Good afternoon,

I gutted a 1967 Packard Bell RPC-39 console. I kept the marvelous Star trek space-age "Solid State" radio but discarded the power amplifier.

The power amplifier was germanium transistor output driven, but I have long since discarded the transistors and I never had the schematic. I kept the decent-sized EI 50V PT and the output driver transformer pair. The markings on these, as shown in the picture are:


606 is the EIA code of Woodward-Schumacher, and the console is from '67 so its reasonable to assume the transformer is from '65. My question is- before going to the length of determining the turns ratio and impedance- should I even bother? Is there a cost-effective use of these in transistor output instrument amps? Is there engineering use outside of audio?
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Old 26th November 2015, 08:54 PM   #2
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The driver transformer doesn't mind whether Ge or Si transistors are employed as the bias is set up separately. Possibly the transistor were OC16? I still have stock of some for repairs in my workshop. Best to keep things original if possible.
The PT is fine for other uses but the driver is a driver and possibly 16 : 1 ratio. Stick a 5volt sine-wave at 1kHX on the primary and measure the outputs. That will give an indication.
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Old 26th November 2015, 09:29 PM   #3
Ggizzy is offline Ggizzy  United States
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Thank you!
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