RE: A slow enough turn on can be achieved in lots of other ways

Posted by Garg0yle (A) on August 29, 2015 at 23:22:00

In Reply to: A slow enough turn on can be achieved in lots of other ways posted by Timbo in Oz on August 29, 2015 at 21:17:44:

Tim I'm not sure if you are familiar with my amps, but do you think I would still see a bass improvement with these 1 watt class A amplifiers?

Even though they have valve rectifiers, the B+ is rock solid in this design.
(As well as the B+ on the 6J5)
It is a direct coupled design with the B+ for the driver coming off the cathode of the 2A3 similar in topology to the Free Lunch and BB Proof etc, but much better performing.

Fortunately they are mono blocs so I could in theory do an A-B comparison, it's just that with this design I would have to reconfigure all of the operating points to account for the increased B+.

It's doable, just tricky, I would have to be reasonably confident before I break out the soldering iron.

While I have not modeled the SS diodes in spice to look for an improvement, it is hard to imagine they would be better then what is there now, from a practical point of view.

Right now a 20Hz full blast sine fluctuates the B+ ~0.8 volts.
a 1000Hz full blast sine fluctuates the B+ ~0.01 volts.

If I may pat myself on the back, they are phenomenal.

Are there other areas I should look for improvements that I am not considering?

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Follow Ups Full Thread

Topic - Bad 5AR4 - Garg0yle 13:03:34 08/27/15 (22)

RE: Bad 5AR4 - Alpha Al 09:48:29 08/28/15 (1)

RE: Bad 5AR4 - Garg0yle 10:29:45 08/28/15 (0)

RE: Bad 5AR4 - Paully 17:45:40 08/27/15 (0)

RE: Bad 5AR4 - krankkall 15:46:09 08/27/15 (0)

I had very bad luck with Sovtek 5AR4's (nt) - gusser 14:16:50 08/27/15 (1)

RE: I had very bad luck with Sovtek 5AR4's (nt) - Eli Duttman 18:53:02 08/27/15 (0)

RE: Bad 5AR4 - Jim McShane 13:14:02 08/27/15 (15)

RE: Bad 5AR4 - Garg0yle 13:33:13 08/27/15 (14)

RE: Bad 5AR4 - Garg0yle 19:48:32 08/27/15 (13)

RE: Bad 5AR4 - Jim McShane 05:47:20 08/28/15 (0)

US made NOS are good, too - FenderLover 04:46:20 08/28/15 (11)

RE: US made NOS are good, too - danlaudionut 03:59:55 08/30/15 (0)

RE: US made NOS are good, too - Garg0yle 08:58:02 08/28/15 (8)

why do you HAVE to have a valve rectifier, anyway? - Timbo in Oz 02:20:48 08/29/15 (7)

RE: why do you HAVE to have a valve rectifier, anyway? - Garg0yle 19:17:18 08/29/15 (4)

A slow enough turn on can be achieved in lots of other ways - Timbo in Oz 21:17:44 08/29/15 (3)

RE: A slow enough turn on can be achieved in lots of other ways - Garg0yle 23:22:00 08/29/15 (2)

Are they SE amps or PP? - Timbo in Oz 00:36:33 08/30/15 (1)

RE: Are they SE amps or PP? - Garg0yle 17:26:33 09/04/15 (0)

RE: why do you HAVE to have a valve rectifier, anyway? - Eli Duttman 09:30:23 08/29/15 (1)

IME using SR SS rectifiers - snubbed - improved the bass a LOT!bit more power - Timbo in Oz 15:00:33 08/29/15 (0)

RE: US made NOS are good, too - Cleantimestream 08:32:40 08/28/15 (0)

Follow Ups

RE: A slow enough turn on can be achieved in lots of other ways - Garg0yle 23:22:00 08/29/15 (2)

Are they SE amps or PP? - Timbo in Oz 00:36:33 08/30/15 (1)

RE: Are they SE amps or PP? - Garg0yle 17:26:33 09/04/15 (0)

RE: A slow enough turn on can be achieved in lots of other ways

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