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Question about 118b
#13

Ron, without the field coil, you would not need the bleeder to provide the minimum field current. You would simply remove the bleeder resistor and replace the field coil with a series resistance of sufficient value to provide 200 to 225 volts for the tubes other than the output stage.

This would be similar to what Philco did in the 38-116, where the output tubes run at full B+ supply voltage and the other tubes operate at lower plate voltage supplied through series dropping resistors.


Messages In This Thread
Question about 118b - by fields 100 - 09-09-2014, 05:14 PM
RE: Question about 118b - by Steve Chambers - 09-09-2014, 07:39 PM
RE: Question about 118b - by SteveJB - 09-09-2014, 08:51 PM
RE: Question about 118b - by Arran - 09-09-2014, 10:25 PM
RE: Question about 118b - by morzh - 09-10-2014, 09:04 AM
RE: Question about 118b - by Ron Ramirez - 09-10-2014, 09:35 AM
RE: Question about 118b - by morzh - 09-10-2014, 03:04 PM
RE: Question about 118b - by fields 100 - 09-10-2014, 03:12 PM
RE: Question about 118b - by morzh - 09-10-2014, 03:21 PM
RE: Question about 118b - by Mondial - 09-10-2014, 08:12 PM
RE: Question about 118b - by Arran - 09-11-2014, 03:54 AM
RE: Question about 118b - by Ron Ramirez - 09-11-2014, 08:08 AM
RE: Question about 118b - by Mondial - 09-11-2014, 09:37 AM



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