[Hallicrafters] Hallicrafters S-77.

[lrlayton at cox.net]

If you don't have the correct ballast tube for 117 volts, (nearly impossible to find),  the mod shown on page 12 of the S-77 manual at the BAMA website should work.

http://bama.edebris.com/manuals/hallicra/s77/

The  S-77 that I sold a few years ago was modified the same  way. You will have to find a couple of 55 volt type 1835 panel lamps and an 8 ohm 15 watt resistor.  The resistors shown for R38 on the schematic on page 11 are actually  resistance wires inside the ballast tube and the values written in might be a cold measurement across the pins. I'm not sure of the differences between the S-77 and S-77A.

Les Layton





---- Brian Goldsmith <brian.goldsmith at echo1.com.au> wrote: 
> Greetings to all.Would anyone have the full details of the ballast resistor
> R38 setup in S77A?It came in two versions, 117Volt and 220Volt.There is some
> information hand written into one of the manuals I have however,the resistor
> values seem to be incorrect.
> 
> Thanks,Brian G. 
> 
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