05-08-2026, 01:45 AM
It looks like the Pacific TV scan of the RCC manual does not show how the dial cable was routed either: https://pacifictv.ca/schematics/sparton410data.pdf
Bob Andersen worked on the U.S version of one of these maybe 15 or more years ago, he was hung up on the C-183 power output tubes which are more like a #45 but with 5 volt filaments, he ended up using 71As which work but are a lot more anemic, and do not accept plate voltages over 180 VDC. However there may be a viable sub in a peculiar variant of a 6V6 designed for series string TV sets, it's called a 5V6, I think that they were used as vertical output tubes or audio output tubes. The one drawback is that I don't think they were made in ST style envelopes, I think they were GT style, but they are beam power tubes so use beam forming plates rather then an extra grid. They also draw less filament current then a 183, 600 Ma verses 1.25 amps.
Regards
Arran
Bob Andersen worked on the U.S version of one of these maybe 15 or more years ago, he was hung up on the C-183 power output tubes which are more like a #45 but with 5 volt filaments, he ended up using 71As which work but are a lot more anemic, and do not accept plate voltages over 180 VDC. However there may be a viable sub in a peculiar variant of a 6V6 designed for series string TV sets, it's called a 5V6, I think that they were used as vertical output tubes or audio output tubes. The one drawback is that I don't think they were made in ST style envelopes, I think they were GT style, but they are beam power tubes so use beam forming plates rather then an extra grid. They also draw less filament current then a 183, 600 Ma verses 1.25 amps.
Regards
Arran
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