RE: Does it have military markings

Posted by BofService (A) on March 12, 2017 at 12:40:44

In Reply to: RE: Does it have military markings posted by DAK on March 12, 2017 at 11:05:37:

Good thinking DAK. Last year I built an RH "Universal" that allows me to experiment with the 6L6 family, including the 807 and 1625 (of which I have several). It turned out good, and I appreciate Alec Kitic's design and documentation efforts on that amplifier.

On this amp I'd like to build with 300Bs and CCS 5842 drivers. Since the B+ from my transformer seems well regulated, that encourages me to think it will work with any tubes that run well at 60ma (or less), 300B included.

Last night I used PSUD to design a separate power supply using the PT's 235-0-235 winding and a couple chokes I have on hand. The supply gives me about 256vdc with .005 v of ripple at 28ma. This should work nicely for a 10M45 CCS and a 5842 per channel. My thoughts are to use the TubeLab "Simple 45" schematic for the driver stage. There are all manner of examples out there for how to do the OP stage. I'm looking at the "sjselectronics SE104it" schematic as a model for the OP right now. I have a pair of Hammond 125ESE OPTs I can use for breadboarding, and invest in some better iron later. I think I have everything else on hand except the OP tubes.

I'd consider trying the TubeLab PowerDrive topology, but I don't quite understand how it works, nor how I would implement it with 2 separate power supplies, nor whether it could work without a negative supply. Also there is the issue that the Toshiba 2SK2700 MOSFET has been deprecated. Which of the analogs are people using to replace it?

TubeLab SE with powerdrive (Open in New Window)

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Follow Ups Full Thread

Topic - What to do with 412 volts - BofService 17:28:26 03/08/17 (20)

RE: The lack of a heater CT is not much of a problem - DAK 19:37:03 03/09/17 (0)

RE: What to do with 412 volts - megasat16 11:53:09 03/09/17 (0)

RE: Are these military potted trannys? - DAK 08:45:49 03/09/17 (10)

RE: Are these military potted trannys? - BofService 11:01:23 03/11/17 (3)

RE: Does it have military markings - DAK 11:05:37 03/12/17 (2)

RE: Does it have military markings - BofService 12:40:44 03/12/17 (1)

RE: Does it have military markings - DAK 14:39:24 03/12/17 (0)

RE: Are these military potted trannys? - BofService 15:30:49 03/10/17 (0)

RE: Are these military potted trannys? - Eli Duttman 18:40:26 03/09/17 (2)

RE: Are these military potted trannys? - BofService 16:05:21 03/10/17 (1)

RE: Are these military potted trannys? - Eli Duttman 17:41:03 03/10/17 (0)

RE: Are these military potted trannys? - Tre' 18:13:53 03/09/17 (1)

Unfortunately, i never collected them - DAK 18:41:53 03/09/17 (0)

Cart before the horse - drlowmu 19:53:33 03/08/17 (0)

RE: What to do with 412 volts - Eli Duttman 18:32:57 03/08/17 (0)

RE: What to do with 412 volts - hifipaul 18:17:44 03/08/17 (1)

RE: What to do with 412 volts - BofService 18:22:46 03/08/17 (0)

125mA will get you one channel - Chip647 17:46:02 03/08/17 (2)

RE: 125mA will get you one channel - BofService 18:13:57 03/08/17 (1)

RE: 125mA will get you one channel - drlowmu 19:58:35 03/08/17 (0)

Follow Ups

RE: Does it have military markings - BofService 12:40:44 03/12/17 (1)

RE: Does it have military markings - DAK 14:39:24 03/12/17 (0)

RE: Does it have military markings

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