Pfanstiehl Model 8 Radio 1925
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This tool is useful for repairing circuits
electronicSgenius com
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that is realy nice
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I really enjoy watching your radio demo videos. Thanks! Gary
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Hey John,
The cost could vary a great deal because most manufacturers offered them with and with out tubes, batteries, antenna, and speaker. So $50 - $90 to $110 would be a good average range.
Regards,
Rick
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What is the reason for 2 audio transformers? Are they both output, different stages or is it one for each speaker coil?
JPa311979 2 years ago
The 2 audio transformers are inter-stage audio coupling. This also insures that all RF is blocked. The horn speaker is connected to the plate of the audio output tube, no transformer.
AllAmericanFiveRadio 2 years ago
Oops-...never mind, I just saw the answer below! :-)
pruefziffer 2 years ago
No problem! This concept of varying the filament voltage is a very obscure concept in todays world.
AllAmericanFiveRadio 2 years ago
Very good documentary on that precious radio, it could be broadcast on TV!
Why are there knobs for the heating voltage for the rf- and audio tubes on the front plate though?
pruefziffer 2 years ago
In the 1920s it was very common to control how the vacuum tube functioned by varying the filament voltage, 5VDC. Lower the filament voltage and it lowers the performance of the tube and of course increasing the voltage increases the performance. This worked OK and it also saved on the 6VDC battery that ran the filaments. Thanks.
AllAmericanFiveRadio 2 years ago