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Retro Amp 50W Single Supply
Retro Amp 50W Single Supply
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Old 11th July 2017, 08:46 AM   #251
ff12 is offline ff12
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Originally Posted by ff12 View Post
Hi guys
I've just built the amp and works just fine with low volume but when I turn up the volume low frequencies start to crash but high frequencies are just fine
Thanks
can anyone help me ?
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Old 11th August 2017, 09:25 AM   #252
Bruce@bluff is offline Bruce@bluff  South Africa
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Has anyone tried running this amp in bridge sort of like a crown floating grounded bridge?
If it distorts on low frequency it could be due to insufficient current or type of oscillation called motorboating put a 100Hz signal in and check with a scope
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Old 13th September 2017, 03:26 PM   #253
Legion is offline Legion  Poland
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I know It's a dumb question but can I modify this amp in order to run it from dual +-40v power supply ?
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Old 13th September 2017, 05:31 PM   #254
Mooly is offline Mooly  United Kingdom
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Retro Amp 50W Single Supply
It could be done. The main problem would be DC stability of the amplifier output and so a servo (OpAmp) would normally be used. There are a few other small things to change as well.

Why do you want to try doing this ?
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Old 13th September 2017, 11:42 PM   #255
wg_ski is offline wg_ski  United States
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Just use the 80 volts as a single rail and ignore the center tap? Of course keep the output coupling cap....
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Old 14th September 2017, 03:30 AM   #256
xrk971 is offline xrk971  United States
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Retro Amp 50W Single Supply
The beauty of this amp is its single rail. There are countless other dual rail amps to choose from in this Forum or even in Apex Audio's collection of amps. Why try to make an orange out of an apple? If you like oranges, eat an orange.
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Last edited by xrk971; 14th September 2017 at 03:33 AM.
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Old 28th September 2017, 12:14 PM   #257
Legion is offline Legion  Poland
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I'll leave it with the single supply and try with +80v

Another question : Maybe instead of 1N4148 I'd use 2x double Schottky To220 and mount it on top of the TO3 transistor ? I'd improve much the temperature compensation I guess.
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