Model 650 Tone Control Question

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Model 650 Tone Control Question

Radioroslyn
Phorum Expert

Posts: 7,266
Threads: 268
Joined: Dec 2009
City: Roslyn Pa

#80

07-13-2023, 05:07 PM

Heathkit got a deal on those 12BY7's. Back in the mid 1950's they use them as the audio driver tube for the modulator section in their 100 watt class AM transmitter the DX-100. P/P1625 (12v 807's) which will make about 120w class ab2. It's transformer coupled and is grid biased from the hv power supply. You'll note that there are two 1/10 of an ohm resistors in the cathode circuit of the 1625's. These are not for biasing but are meter shunts.

https://archive.org/details/heathkit_dx-100_manual

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry

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Messages In This Thread

Model 650 Tone Control Question - by Hamilton - 06-27-2023, 09:45 AM

RE: Model 650 Tone Control Question - by morzh - 06-27-2023, 11:11 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 06-27-2023, 01:39 PM

RE: Model 650 Tone Control Question - by Hamilton - 06-27-2023, 04:49 PM

RE: Model 650 Tone Control Question - by morzh - 06-27-2023, 06:26 PM

RE: Model 650 Tone Control Question - by Hamilton - 06-29-2023, 07:03 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 06-29-2023, 07:17 AM

RE: Model 650 Tone Control Question - by RodB - 06-29-2023, 08:09 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 06-29-2023, 09:20 AM

RE: Model 650 Tone Control Question - by Chas - 06-29-2023, 09:26 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 06-29-2023, 09:32 AM

RE: Model 650 Tone Control Question - by morzh - 06-29-2023, 09:57 AM

RE: Model 650 Tone Control Question - by Hamilton - 06-29-2023, 10:46 AM

RE: Model 650 Tone Control Question - by RodB - 06-30-2023, 07:31 AM

RE: Model 650 Tone Control Question - by Hamilton - 06-30-2023, 10:45 AM

RE: Model 650 Tone Control Question - by Hamilton - 06-30-2023, 01:07 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 06-30-2023, 04:22 PM

RE: Model 650 Tone Control Question - by Hamilton - 06-30-2023, 06:57 PM

RE: Model 650 Tone Control Question - by Hamilton - 06-30-2023, 07:13 PM

Hamilton - by Hamilton - 07-03-2023, 09:13 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-03-2023, 09:28 AM

RE: Model 650 Tone Control Question - by Steve Davis - 07-03-2023, 10:50 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-03-2023, 11:10 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-03-2023, 10:25 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-03-2023, 11:40 PM

462ron - by 462ron - 07-04-2023, 07:56 AM

Hamilton - by Hamilton - 07-04-2023, 08:54 AM

462ron - by 462ron - 07-04-2023, 09:06 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-04-2023, 09:43 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-04-2023, 02:13 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-04-2023, 03:26 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-04-2023, 03:38 PM

RE: Model 650 Tone Control Question - by DaleHCook - 07-04-2023, 04:08 PM

RE: Model 650 Tone Control Question - by radiorich - 07-04-2023, 11:18 PM

RE: Model 650 Tone Control Question - by Hamilton - 07-06-2023, 07:11 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-06-2023, 10:40 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-07-2023, 06:48 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-07-2023, 01:59 PM

RE: Model 650 Tone Control Question - by RodB - 07-07-2023, 02:11 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-07-2023, 08:23 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-07-2023, 08:45 PM

RE: Model 650 Tone Control Question - by Hamilton - 07-08-2023, 08:30 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-08-2023, 11:07 AM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-08-2023, 01:45 PM

RE: Model 650 Tone Control Question - by Ron Ramirez - 07-08-2023, 02:44 PM

RE: Model 650 Tone Control Question - by morzh - 07-08-2023, 04:32 PM

RE: Model 650 Tone Control Question - by Hamilton - 07-09-2023, 05:15 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-09-2023, 06:55 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-09-2023, 09:16 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-09-2023, 10:03 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 07-09-2023, 10:16 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-09-2023, 10:24 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 07-09-2023, 10:28 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-09-2023, 11:12 AM

RE: Model 650 Tone Control Question - by Ron Ramirez - 07-09-2023, 11:32 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-09-2023, 12:43 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-10-2023, 09:39 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-10-2023, 03:39 PM

RE: Model 650 Tone Control Question - by DaleHCook - 07-10-2023, 06:03 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-10-2023, 06:57 PM

RE: Model 650 Tone Control Question - by DaleHCook - 07-10-2023, 07:41 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-11-2023, 08:04 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-11-2023, 09:35 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-11-2023, 02:37 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-11-2023, 08:10 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-12-2023, 06:41 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-12-2023, 06:50 AM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-12-2023, 07:14 AM

RE: Model 650 Tone Control Question - by DaleHCook - 07-12-2023, 08:14 AM

RE: Model 650 Tone Control Question - by Hamilton - 07-12-2023, 11:20 AM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-12-2023, 03:32 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-12-2023, 04:58 PM

RE: Model 650 Tone Control Question - by Hamilton - 07-12-2023, 05:46 PM

RE: Model 650 Tone Control Question - by Hamilton - 07-12-2023, 05:49 PM

RE: Model 650 Tone Control Question - by DaleHCook - 07-13-2023, 08:56 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-13-2023, 03:13 PM

RE: Model 650 Tone Control Question - by Arran - 07-13-2023, 03:39 PM

RE: Model 650 Tone Control Question - by DaleHCook - 07-13-2023, 04:04 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-13-2023, 04:13 PM

RE: Model 650 Tone Control Question - by Radioroslyn - 07-13-2023, 05:07 PM

RE: Model 650 Tone Control Question - by Ron Ramirez - 07-13-2023, 07:08 PM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-14-2023, 05:05 AM

RE: Model 650 Tone Control Question - by MrFixr55 - 07-14-2023, 05:25 AM

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