Re: Dual power supply question - gymwear5@hotmail.com - Tube DIY Asylum

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Re: Dual power supply question

gymwear5@hotmail.com

In Reply to: Re: Dual power supply question posted by Russell DeAnna on December 30, 2005 at 07:46:36:

Let's get to the goal... Optimum performance - with minimum non-linear behavior, and a matched transfer function between amplifiers.
the power supply effects both. When a power supply drops because of output power draw, then is could effect the behavior (biasing, etc.) of the input and driver stages -hence the added regulation for these circuits - sometimes delivered using a completely separate power supply.
The major argument for a single supple is the matching of transfer function - when the amp IS driven into non-linearity in one channel - then wouldn't you want the less driven channel to have the same non-linear behavior? Of course if you have little non-linear behavior anyway then who cares...
By the way - easy to check transfer function matching. Tie an output transformer across the + terminals of the two channels - don't forget to use normal loading for the two channels to ground. Feed the same signal to both input channels (music, pink noise, swept sine) then listen to the output of the "bridged" transformer. For a good match the levels should be 70dB down. Very difficult to achieve, BIoN. You may have to but your driven channels loudspeakers in another room to hear the difference signal - and scope it to look at the frequency components.
Great exercise for the DIY'er!

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Follow Ups Full Thread

Topic - Dual power supply question - Steve King 06:29:42 12/30/05 (12)

Re: Dual power supply question - kadyquil2 06:33:55 12/31/05 (0)

both? - sort of - shane. 19:19:44 12/30/05 (0)

Choke input ? - Mark Kelly 16:58:41 12/30/05 (0)

Separate STAGES is my favorite - drlowmu 12:15:59 12/30/05 (0)

For me it is a question of - sser2 11:01:49 12/30/05 (0)

In stereo amps, of course there are degrees of separateness. - jeffreybehr 09:26:45 12/30/05 (0)

Re: Dual power supply question - Russell DeAnna 07:46:36 12/30/05 (2)

Re: Dual power supply question - gymwear5@hotmail.com 08:57:12 12/30/05 (1)

It seems like you mean - sser2 11:17:56 12/30/05 (0)

why do it at all? - Joel Tunnah 07:08:58 12/30/05 (0)

Re: Dual power supply question - REL54 06:54:02 12/30/05 (1)

Re: Dual power supply question - Steve King 08:09:01 12/30/05 (0)

Follow Ups

Re: Dual power supply question - gymwear5@hotmail.com 08:57:12 12/30/05 (1)

It seems like you mean - sser2 11:17:56 12/30/05 (0)

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