In Reply to: Given the right circuit and implementation, the whole "low everything" can work. posted by Chris O on August 20, 2012 at 08:36:08:
"The problem most people have is not with the low DCR power transformers and chokes; these are universally good"
The problem with these designs is that the low DCR chokes have insufficient inductance to properly filter the B+, and the inadequacies of the design are aggravated by the use of undersized filter caps. I've SPICEd these circuits looking back into the supplies, and the source Z is truly awful. They might be passable powering a Class A amp with constant average current draw (and I want to stress that *passable* is not the goal of high-end audio design), but their functionality as a voltage source over audio frequencies is otherwise unacceptable. This is junk engineering in every sense of the phrase.
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Follow Ups
- No, you're not getting it... - Triode_Kingdom 13:28:11 08/20/12 (57)
- "...the source Z is truly awful..." - Lew 14:00:02 08/21/12 (52)
- RE: "...the source Z is truly awful..." - Tre' 21:31:34 08/21/12 (0)
- RE: "...the source Z is truly awful..." - Triode_Kingdom 20:19:05 08/21/12 (49)
- Thanks, TK and Tre' - Lew 07:41:22 08/22/12 (48)
- RE: Thanks, TK and Tre' - drlowmu 12:12:56 08/22/12 (47)
- RE: Thanks, TK and Tre' - Ray Moth 19:03:05 08/23/12 (2)
- FOR WHAT, MISLEADING YOU AGAIN !!! - drlowmu 19:25:30 08/23/12 (1)
- RE: FOR WHAT, MISLEADING YOU AGAIN !!! - Ray Moth 16:32:35 08/24/12 (0)
- Alice in Wonderland - Triode_Kingdom 19:55:15 08/22/12 (19)
- RE: Alice in Wonderland - drlowmu 21:22:05 08/22/12 (18)
- Ya know Alice... - wheezer 06:30:03 08/23/12 (17)
- RE: Ya know Alice... - drlowmu 07:46:03 08/23/12 (16)
- How about some o'scope pics at C1 or L1 and so forth - wheezer 08:21:41 08/23/12 (15)
- Sure - drlowmu 18:59:21 08/23/12 (0)
- Not o'scope pics but... - Tre' 09:00:48 08/23/12 (13)
- RE: Not o'scope pics but... - wheezer 17:01:47 08/23/12 (0)
- Good job! - mikeyb 09:50:31 08/23/12 (11)
- RE: Good job! - Tre' 10:05:03 08/23/12 (10)
- Thanks! - mikeyb 10:14:36 08/23/12 (9)
- RE: Thanks! - drlowmu 18:52:49 08/23/12 (8)
- Hardly ... - mikeyb 05:45:51 08/24/12 (1)
- RE: Hardly ... - drlowmu 15:37:32 08/24/12 (0)
- RE: Are you going to debunk Ohm's Law?? - Ray Moth 19:14:50 08/23/12 (5)
- RE: Are you going to debunk Ohm's Law?? - drlowmu 19:39:21 08/23/12 (4)
- RE: Are you going to debunk Ohm's Law?? - Ray Moth 20:26:08 08/24/12 (3)
- RE: Are you going to debunk Ohm's Law?? - drlowmu 22:51:31 08/25/12 (2)
- RE: Are you going to debunk Ohm's Law?? - Ray Moth 02:56:45 08/26/12 (1)
- RE: Are you going to debunk Ohm's Law?? - drlowmu 07:57:01 08/26/12 (0)
- RE: Thanks, TK and Tre' - Lew 13:00:39 08/22/12 (23)
- RE: Thanks, TK and Tre' - drlowmu 19:48:14 08/22/12 (3)
- RE: Thanks, TK and Tre' - Triode_Kingdom 20:03:59 08/22/12 (2)
- RE: Jeff's Unfiltered Power Supplies - mach1 21:25:15 08/22/12 (1)
- JUPS It is!! (nt) - Triode_Kingdom 05:59:21 08/23/12 (0)
- RE: Thanks, TK and Tre' - Tre' 16:29:42 08/22/12 (18)
- Input and driver stage supply, not output supply - Lew 07:35:45 08/23/12 (10)
- Broskie - Tre' 13:46:02 08/23/12 (6)
- RE: Broskie - Lew 14:08:05 08/23/12 (5)
- RE: Broskie - wheezer 08:02:29 08/24/12 (0)
- RE: Broskie - Tre' 14:42:40 08/23/12 (3)
- RE: Broskie - Lew 18:39:32 08/23/12 (0)
- OR....... - Tre' 14:55:15 08/23/12 (1)
- Yep... - Lew 22:04:14 08/23/12 (0)
- RE: Input and driver stage supply, not output supply - Tre' 07:52:17 08/23/12 (2)
- RE: Input and driver stage supply, not output supply - Lew 08:03:48 08/23/12 (1)
- RE: Input and driver stage supply, not output supply - drlowmu 20:43:33 08/23/12 (0)
- RE: Thanks, TK and Tre' - tube wrangler 20:15:32 08/22/12 (6)
- RE: Thanks, TK and Tre' - Banat 07:31:05 08/23/12 (5)
- RE: Thanks, TK and Tre' - tube wrangler 11:58:49 08/23/12 (4)
- RE: Thanks, TK and Tre' - Banat 13:00:47 08/23/12 (3)
- RE: Thanks, TK and Tre' - tube wrangler 22:44:45 08/23/12 (2)
- RE: Thanks, TK and Tre' - Banat 06:10:19 08/24/12 (1)
- RE: Thanks, TK and Tre' - tube wrangler 08:19:38 08/24/12 (0)
- RE: "...the source Z is truly awful..." - drlowmu 19:39:06 08/21/12 (0)
- RE: No, you're not getting it... - Chris O 13:44:48 08/20/12 (3)
- RE: No, you're not getting it... - Triode_Kingdom 19:26:40 08/20/12 (2)
- Usually inductance is quoted at a given load, with the caveat... - Chris O 05:05:59 08/21/12 (1)
- RE: Usually inductance is quoted at a given load, with the caveat... - drlowmu 07:33:55 08/21/12 (0)