TrueTone Model D9?

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TrueTone Model D9?

Arran
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Posts: 4,865
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Joined: Sep 2008
City: Sandwick, BC, CA

#6

04-01-2017, 02:46 AM

If I'm right about the power supply in this set they may be connecting the battery tube filaments, in series with the cathode of the amplifier section of the 70L7 tube, it probably also has a dropping resistor in series with the heater of the 70L7 tube. I have one or two radios that work this way, it gives you much more audio power then the 3Q5 tube would.
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Arran

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Messages In This Thread

TrueTone Model D9? - by WallaceRoger - 03-29-2017, 08:33 PM

RE: TrueTone Model D9? - by KCMike - 03-29-2017, 09:15 PM

RE: TrueTone Model D9? - by Arran - 03-29-2017, 10:50 PM

RE: TrueTone Model D9? - by WallaceRoger - 03-30-2017, 09:45 PM

RE: TrueTone Model D9? - by David - 03-31-2017, 07:57 PM

RE: TrueTone Model D9? - by Arran - 04-01-2017, 02:46 AM

RE: TrueTone Model D9? - by WallaceRoger - 04-03-2017, 04:20 PM

RE: TrueTone Model D9? - by Arran - 04-04-2017, 04:26 AM

RE: TrueTone Model D9? - by Radioroslyn - 04-03-2017, 10:56 PM

RE: TrueTone Model D9? - by Radioroslyn - 04-04-2017, 05:43 AM

RE: TrueTone Model D9? - by WallaceRoger - 04-04-2017, 03:07 PM

RE: TrueTone Model D9? - by WallaceRoger - 04-04-2017, 03:18 PM

RE: TrueTone Model D9? - by WallaceRoger - 04-30-2017, 12:26 PM

RE: TrueTone Model D9? - by WallaceRoger - 05-01-2017, 01:37 PM

RE: TrueTone Model D9? - by Eliot Ness - 05-01-2017, 02:03 PM

RE: TrueTone Model D9? - by WallaceRoger - 05-01-2017, 08:48 PM

RE: TrueTone Model D9? - by WallaceRoger - 07-24-2017, 09:36 PM

TrueTone Model D9 - by WallaceRoger - 08-08-2017, 10:44 PM

RE: TrueTone Model D9? - by Arran - 08-09-2017, 03:31 AM

RE: TrueTone Model D9? - by Paul Philco322 - 08-15-2017, 08:43 PM

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