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Old 31st July 2003, 03:37 AM   #1
Shaz is offline Shaz  United States
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Default Stereo Gainclone w/ One Transformer

When using a single transformer to power a two-channel (stereo) gainclone amp, is it best to parallel the transformer secondary leads to two bridge rectifiers powering each channel, or to use a single bridge rectifer and parallel the two OpAmp circuits to the DC rails of a single bridge rectifier?
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Old 31st July 2003, 02:27 PM   #2
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I think a separate bridge for each channel would be better. I'm planning to use a single 400VA tranny with separate bridges for each channel, built from MSR860 soft recovery diodes.
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Old 31st July 2003, 02:46 PM   #3
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It works fine. I use a single 500 VA to power 4 gainclones. Albeit two of them are tweeter amps, so they dont ever really put out more than a watt or two. I also use a single set of diode bridges.
-Paul Hilgeman
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Old 31st July 2003, 06:28 PM   #4
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shaz I have gone both routes with success although separate diode bridges are a preferable design separate capacitor filtering is a must either way

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Old 31st July 2003, 06:40 PM   #5
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Originally posted by Sparhawk
I think a separate bridge for each channel would be better. I'm planning to use a single 400VA tranny with separate bridges for each channel, built from MSR860 soft recovery diodes.
It's definitely advisable to use separate bridge for ea.rail, I don't know how much improvement you get when you separate them additionaly between channels.

I also tried those MSR860 diodes and initially I thought thay were better, but later I found they are too bright and I'm using MUR860 only. Of course it is dependant on the rest of a setup and it may be actually preferrable in some. For instance I found that with Kimber umbilical cord those MSR diodes were pretty much acceptable, but when I switched to Cardas cord they became too bright.

I have whole bunch of the MSR diodes available, so if anyone's interested, I can sell them.
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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