+1 - Tre' - Tube DIY Asylum

There is no reason the music should be killed just because you properly filter the B+.

In some cases having too little inductance and capacitance in a power supply filter will cause the B+ voltage to soar and sag with the music, giving it a more dynamic sound.

Having a fast settling time means that the voltage drop (or rise) happens very fast. With Class A circuits the average current draw is constant.

The power supply only has to hold the voltage steady against the current draw change that follows the music signal. The longest 'time of change' would be 12.5ms. (1/4 wave of the lowest frequency of interest, 20Hz)

Take a look at what happens in the first 12.5ms when using the PSUD's step function (which by the way does not represent anything that happens in a Class A circuit).

Remember, following the first 1/4 wave of increased (or decreased, in the case of a 2 stage amp) current draw is a 1/4 wave of decreased current draw (getting us back to the idle current draw) followed by a 1/4 wave of decreased current draw and then 1/4 wave of increased current draw getting us back to idle again.

The longer the settling time the less the voltage sags (or soars) in that first 12.5ms. The shorter the settling time the more the voltage sags (or soars) in that first 12.5ms.

Some people like that sound but it has to be considered distortion.

Longer settling times equals greater voltage regulation and that leads to less distortion of the output signal.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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Follow Ups Full Thread

Topic - Comments please on this statement..Ahemmm..."Kill the hum...Kill the Music." - Iczerman 09:21:43 06/15/15 (14)

RE: Comments please on this statement..Ahemmm..."Kill the hum...Kill the Music." - Al Noakes 10:21:33 06/17/15 (0)

Boys and Girls - drlowmu 09:39:31 06/17/15 (0)

The question you should ask... - PakProtector 07:11:14 06/16/15 (0)

too much inductance won't kill sound but too much capacitance might - lovetube 02:31:32 06/16/15 (6)

RE: too much inductance won't kill sound but too much capacitance might - drlowmu 09:28:50 06/18/15 (1)

RE: too much inductance won't kill sound but too much capacitance might - jazbo8 02:55:40 06/19/15 (0)

Agreed... I use 8 henry chokes 300 ma with DCR 35~nT - Cleantimestream 17:23:50 06/16/15 (0)

RE: too much inductance won't kill sound but too much capacitance might - vinnie2 16:55:18 06/16/15 (0)

I think you might be right... - Iczerman 08:36:03 06/16/15 (1)

RE: I think you might be right... - Triode_Kingdom 07:54:44 06/17/15 (0)

Kill the hum, listen to the music. - Lew 19:11:41 06/15/15 (0)

RE: Comments please on this statement..Ahemmm..."Kill the hum...Kill the Music." - BofService 10:02:17 06/15/15 (2)

+1 - Tre' 10:51:20 06/15/15 (1)

RE: +1 - Eli Duttman 11:11:16 06/15/15 (0)

Follow Ups

+1 - Tre' 10:51:20 06/15/15 (1)

RE: +1 - Eli Duttman 11:11:16 06/15/15 (0)

+1

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