RE: Choose: 300b SET or 2a3 PP?

Posted by shane. (A) on May 26, 2012 at 00:09:37

In Reply to: RE: Choose: 300b SET or 2a3 PP? posted by andy evans on May 25, 2012 at 10:16:26:

Hi Andy,

Yes, we certainly are..

Do I think the LF performance advantage that you have with the PP2A3 over the SE is due to 2A3 v 300B. No, I dont. I think it has more to do with the amount of inductance that is loading the tube, and perhaps any LP poles that might be associated with an RC biased output stage.

With the PP amp, yes, as with the PSE amp input/driver are direct coupled.. I'll attach a schematic. It wont quite handle line voltage fluctuations well with regard to bias of the driver and output tube grid, I'll keep that one, but for an illustration it will suit the purpose nicely.

I hear what you say about the Type 26. Not sure if one can compare two of anything unless all else is the same. And on that, sometimes one part will work and another will not. For instance, battery heating a 26 isnt what I'd want to do and without doing it that way for the input stage, I might not be able to direct couple two stages without a large Rk on the second tube, with its associated bypass cap. No so simple comparison anymore.

Regards,
Shane

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Follow Ups Full Thread

Topic - Choose: 300b SET or 2a3 PP? - andy evans 06:26:27 05/19/12 (21)

RE: Choose: 300b SET or 2a3 PP? - Wojciech 21:18:00 05/25/12 (0)

RE: Choose: 300b SET or 2a3 PP? - shane. 00:09:10 05/25/12 (4)

RE: Choose: 300b SET or 2a3 PP? - andy evans 10:16:26 05/25/12 (3)

RE: Choose: 300b SET or 2a3 PP? - shane. 05/26/1200:09:37 05/26/12 (2)

RE: Choose: 300b SET or 2a3 PP? - andy evans 02:31:20 05/26/12 (1)

RE: Choose: 300b SET or 2a3 PP? - shane. 23:18:58 05/26/12 (0)

RE: Choose: 300b SET or 2a3 PP? - hahax@verizon.net 19:29:52 05/19/12 (0)

A Possible Alternative - 6CB5A - FlaCharlie 09:57:57 05/19/12 (5)

RE: A Possible Alternative - 6CB5A - andy evans 13:15:44 05/19/12 (4)

Another Alternative: JJ 2A3-40 run as a 300B - Minussss3db 13:27:24 05/19/12 (3)

RE: Another Alternative: JJ 2A3-40 run as a 300B - andy evans 13:36:44 05/19/12 (2)

Another Alternative: JJ 2A3-40 run as a 300B - Minussss3db 13:47:18 05/19/12 (1)

RE: Another Alternative: JJ 2A3-40 run as a 300B - andy evans 13:54:15 05/19/12 (0)

RE: Choose: 300b SET or 2a3 PP? - bean 09:06:47 05/19/12 (3)

RE: Choose: 300b SET or 2a3 PP? - andy evans 13:29:11 05/19/12 (2)

COOL Andy, so you have found the 4P1L magic...nice - Minussss3db 13:40:35 05/19/12 (1)

RE: COOL Andy, so you have found the 4P1L magic...nice - andy evans 13:58:29 05/19/12 (0)

RE: Choose: 300b SET or 2a3 PP? - Neff 06:51:08 05/19/12 (2)

RE: Choose: 300b SET or 2a3 PP? - andy evans 13:34:27 05/19/12 (1)

RE: Choose: 300b SET or 2a3 PP? - Jim Womble 05:11:44 05/21/12 (0)

RE: Choose: 300b SET or 2a3 PP? - coolhand 06:31:29 05/19/12 (0)

Follow Ups

RE: Choose: 300b SET or 2a3 PP? - shane. 05/26/1200:09:37 05/26/12 (2)

RE: Choose: 300b SET or 2a3 PP? - andy evans 02:31:20 05/26/12 (1)

RE: Choose: 300b SET or 2a3 PP? - shane. 23:18:58 05/26/12 (0)

RE: Choose: 300b SET or 2a3 PP?

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