In Reply to: RE: In Pentode, G2 is of prime importance posted by Triode_Kingdom on August 8, 2012 at 13:14:21:
Hi Triode Kingdom :
Incorrect. Speaking from direct experience, I have owned and heard MANY highly regarded high quality tube amps since the 1970s with actively regulated G2 supplies. Results always left me wanting for more.
There is NO substitute for a (1) totally separate (2) low DCR supply to G2, assuming one seeks maximum performance. It brings a certain music presentation to the table, (bold, AUTHORITATIVE, vivid, detailed and nuanced) that you can NOT obtain ANY other way. Its simply the very best way to execute G2.
It is similar conceptually to building an amp with totally separate supplies for each stage, except G2 of the Pentode Finals is much more sensitive than that.
You have simply under-estimated the sensitivity (and importance) of G2 Triode Kingdom, as MOST ordinary E.E.s do.
Here are the three ways to do G2, each successively better sounding :
(1) Most E.E.s will use a cheap-o resistive voltage divider to separate G2., mediocre.
(2) Some E.E.s will add a active regulator, (unfortunately, with its own thumbprint, because G2 is sensitive).
(3) Walter Key in the 1970's, (and I), will advocate a totally separate passive G2 supply,..... cleanest sounding and simple.
Now you all have been made aware.
This is why the Paoli 60M, with a separate G2 supply, has had a following over many years.
Imagine how this new build will perform for "The Bob" - with really good sets of power supplies ( B+, G2, negative bias) supporting his circuit !! If you want an amp to perform, you need to give it really good supplies, or, you are just playing with yourself.
In 2012, we have progressed from the 1970's, and have learned how to design SUPERB passive supplies. It is PSUDED above, for anyone interested. A cheap gas tube G2 voltage regulator off an existing supply that you propose.... will never be the equal.
If it didn't make a significant difference, I would not go to the trouble to build it as I show you all.
But it DOES make a difference, and it is very audible. "The Bob" will have some real fun, and benefit tremendously.
Cheers,
Jeff Medwin
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: In Pentode, G2 is of prime importance - drlowmu 07:29:19 08/09/12 (58)
- Elitist Nonsense - Triode_Kingdom 08:13:30 08/10/12 (1)
- Hardly elitist, just the truth - drlowmu 08:50:44 08/10/12 (0)
- RE: In Pentode, G2 is of prime importance - tube wrangler 15:35:44 08/09/12 (0)
- Question from the peanut gallery - Lew 14:31:18 08/09/12 (19)
- Answer from the peanut gallery - Ray Moth 17:09:23 08/11/12 (10)
- G2 , wide current changes ..... - drlowmu 09:18:18 08/15/12 (0)
- RE: Answer from the peanut gallery - tube wrangler 16:18:43 08/12/12 (5)
- RE: Answer from the peanut gallery - Ray Moth 17:02:33 08/12/12 (4)
- RE: Answer from the peanut gallery - drlowmu 11:14:05 08/14/12 (3)
- It was a goodpost. - gusser 11:35:47 08/14/12 (2)
- Partially good post. - drlowmu 14:17:19 08/14/12 (1)
- RE: Partially good post. - Ray Moth 03:52:31 08/22/12 (0)
- "CCS driving a resistor"... - Lew 13:41:21 08/12/12 (2)
- RE: "CCS driving a resistor"... - Ray Moth 16:49:01 08/12/12 (1)
- A belated thanks... - Lew 10:51:28 08/14/12 (0)
- RE: Question from the peanut gallery - Triode_Kingdom 08:15:41 08/10/12 (0)
- RE: Question from the peanut gallery - drlowmu 14:57:16 08/09/12 (6)
- RE: Question from the peanut gallery - Lew 20:14:56 08/09/12 (5)
- RE: Question from the peanut gallery - drlowmu 21:20:14 08/09/12 (4)
- Mel Schilling... - Lew 06:48:06 08/10/12 (3)
- RE: Mel Schilling... - drlowmu 07:07:17 08/10/12 (2)
- RE: Mel Schilling... - Lew 08:03:18 08/10/12 (1)
- RE: Mel Schilling... - drlowmu 08:44:58 08/10/12 (0)
- Let's see some numbers then... - gusser 11:09:48 08/09/12 (34)
- What numbers ? - drlowmu 13:17:51 08/09/12 (33)
- Just Absurd! - gusser 13:53:41 08/09/12 (32)
- Worse than Absurd! - Triode_Kingdom 10:59:52 08/11/12 (31)
- You're gettin too emotional, and unbalanced TK - drlowmu 12:09:13 08/11/12 (1)
- Personal Attacks Won't Fix Your Amplifiers - Triode_Kingdom 19:04:53 08/11/12 (0)
- What I don't get... - gusser 11:50:44 08/11/12 (28)
- RE: What I don't get... - tube wrangler 11:18:45 08/12/12 (4)
- 12v Computer Power Supply? - gusser 11:49:43 08/12/12 (2)
- RE: 12v Computer Power Supply? - tube wrangler 20:56:31 08/12/12 (1)
- RE: 12v Computer Power Supply? - gusser 10:11:32 08/13/12 (0)
- Just more cowboy logic! - gusser 11:35:58 08/12/12 (0)
- RE: What I don't get... - drlowmu 00:01:43 08/12/12 (22)
- RE: get on the plane... - deathtube 667 05:11:59 08/12/12 (21)
- Who selects the musical passages? - gusser 10:47:05 08/12/12 (20)
- RE: Who selects the musical passages? - tube wrangler 00:15:29 08/13/12 (0)
- RE: Who selects the musical passages? - deathtube 667 12:27:44 08/12/12 (18)
- I don't think you get it! - gusser 12:30:53 08/12/12 (17)
- RE: I don't think you get it! - tube wrangler 23:28:29 08/12/12 (15)
- RE: I don't think you get it! - gusser 10:28:56 08/13/12 (14)
- RE: I don't think you get it! - wrangler 11:59:54 08/13/12 (0)
- ALL you need to know..... - drlowmu 10:59:15 08/13/12 (12)
- RE: ALL you need to know..... - deathtube 667 06:48:42 08/14/12 (11)
- Let me getthis straight? - gusser 10:44:11 08/14/12 (10)
- RE: Let me get this straight? - deathtube 667 17:33:06 08/14/12 (1)
- RE: Let me get this straight? - gusser 17:51:25 08/14/12 (0)
- RE: Let me get this straight? - drlowmu 11:18:27 08/14/12 (7)
- RE: Let me get this straight? - gusser 11:31:18 08/14/12 (6)
- RE: Let me get this straight? - drlowmu 11:38:32 08/14/12 (5)
- Ahh, OK - gusser 11:43:34 08/14/12 (4)
- RE: Ahh, OK - tube wrangler 20:40:15 08/14/12 (3)
- RE: great post ... - deathtube 667 04:33:48 08/16/12 (2)
- Seroius Stereo... - gusser 11:53:36 08/16/12 (1)
- RE: Serious Stereo... - deathtube 667 13:34:49 08/16/12 (0)
- Junk Science - Triode_Kingdom 16:31:51 08/12/12 (0)