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Old 30th March 2002, 12:50 AM   #1
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Default Modifying preamp power supply

My current preamp, which is actualy front stage of A75 is using +/- 30V regulated power supply. I was planning on building Aleph P preamp in a same chassis and use the current PS. Can I connect regulated -30V to ground and use +30V as a positive voltage supply achieving that way +60V. The ground of the +/- 30V supply is not connected. Any advantages/disadvantages to that setup? Thanks for any info.

Peter
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Old 30th March 2002, 01:31 PM   #2
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There should be no problem at all, as long as the center tap of your ps isn't grounded somewhere.
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Old 2nd April 2002, 03:53 PM   #3
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Peter,

How do you like the sound of the A75 front end, used as a pre-amp?

Jam
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Old 2nd April 2002, 04:27 PM   #4
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To some people it sounds better than BOZ.
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Old 2nd April 2002, 07:12 PM   #5
jam is offline jam  United States
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Peter,

I am in the opinion that the A75 never got the credit it deserved. I built the amplifier and it easily took out some high priced competition.

Jam

P.S. I hope one day Mr.Pass will re-visit the design.
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Old 2nd April 2002, 09:48 PM   #6
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I have built 3 monoblock pairs of A75 since 1993. Although I have parts for another 3 sets of Alephs (including sinks and transformers) I'm not rushing with those projects. My A75s sound really good and I didn't feel the need to replace them yet.
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