They produce DC, which we can't hear and which we MUST block.

They don't produce much switching noise harmonics either, but they certainly do limit how much storage we can achieve.

Note that I am not saying the amp's don't sound different with different VRs, just that it can only be due to their differing voltage drop. Unless we can hear DC, and I'm pretty certain we can't.

The difference in storage at with a lowish 400 V supply +/- say 15 volts at the top of the HV rail is quite significant. Viz. let's take a 400V notional supply and add / subtract 15 V. The factor to multiply the capacitance by is just 148,225 at 385 V, against 160,000 with no drop and 172,225 with 415 volts.

Plus or minus 5 v with a supply voltage ~ 600V? for KT88 style amps will have even greater impact.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

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Follow Ups Full Thread

Topic - Anyone compare these? - Winston Smith 12:31:11 10/29/16 (19)

RE: WS, is your PS 5ar4 or 5r4 rectified? - DAK 18:53:55 10/30/16 (2)

The PSU is a ModWright PS 9.0...... - Winston Smith 19:41:31 10/30/16 (1)

RE: The PSU is a ModWright PS 9.0...... - DAK 03:42:23 10/31/16 (0)

RE: Actually 5r4g is not the "same" as 5ar4 - DAK 15:42:24 10/30/16 (4)

RE: Actually 5r4g is not the "same" as 5ar4 - Eli Duttman 17:14:14 10/30/16 (3)

RE: The seller is certainly "knowledgable" - DAK 18:26:54 10/30/16 (0)

RE: Actually 5r4g is not the "same" as 5ar4 - FenderLover 18:13:59 10/30/16 (1)

Outstanding! Very helpful. Thank you very much! (Nt.) - Winston Smith 19:46:28 10/30/16 (0)

RE: what about the gz37? - DAK 15:28:48 10/30/16 (2)

Paul Burgess in Auckland, perhaps? (Nt.) - Winston Smith 19:55:15 10/30/16 (1)

RE: Paul Burgess in Auckland, perhaps? (Nt.) - DAK 03:34:08 10/31/16 (0)

Gidday mate! :-) - Timbo in Oz 21:39:25 10/29/16 (2)

From across the Tasman, a G'Day to you too, Timbo! - Winston Smith 00:44:10 10/30/16 (1)

RE: From across the Tasman, a G'Day to you too, Timbo! - Michael Samra 03:56:54 10/30/16 (0)

RE: Anyone compare these? - Sondek 19:27:31 10/29/16 (4)

I think..... - Winston Smith 00:27:30 10/30/16 (3)

Disbelieving rectifiers sound different is like disbelieving audio tubes sound different....... - Interstage Tranny 16:20:50 10/30/16 (2)

They produce DC, which we can't hear and which we MUST block. - Timbo in Oz 22:56:00 10/30/16 (0)

I believe..... - Winston Smith 19:36:14 10/30/16 (0)

Follow Ups

They produce DC, which we can't hear and which we MUST block. - Timbo in Oz 22:56:00 10/30/16 (0)

They produce DC, which we can't hear and which we MUST block.

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