PS Audio Moving Coil Amplifier (MCA) Schematic - diyAudio
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Old 17th April 2007, 08:08 PM   #1
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Default PS Audio Moving Coil Amplifier (MCA) Schematic

Trying to locate a schematic on the PS Audio Moving Coil Amplifier (their terminology) no model number but successor was the MCA-2. Current company does not have anything on older equipment.
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Old 17th April 2007, 11:18 PM   #2
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Many years ago I traced out the schematic for one of these, it's actually quite a simple circuit. I can probably dig it out and scan it for you if you like, although it wouldn't take a lot of effort to do it again.

Are you having problems with one or are you just curious?

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Doug
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Old 18th April 2007, 02:23 AM   #3
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"Are you having problems with one or are you just curious?"

A little of both. Just bought one and want to make sure everything is halfway right.
One thing I REALLY need is information on the AC adapter (volts, polarity, etc.)

I'd appreciate any information you have.
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Old 18th April 2007, 03:43 AM   #4
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OK, I have found the instruction sheet that came with the unit, as well as a specification sheet, and my old hand-drawn schematic. There are no component values on my schematic, and it's pretty messy.

I'm not sure of the specifications for the adapter, but on the weekend I could dig out my actual amplifier and measure it for you, and get actual component values as well if you need them. The adapter just supplies AC to the main unit where the rectifiers are located, so it's really just a power transformer. PS Audio originally sold this product with a small low current transformer (~0.5 amps) and later added a high current optional transformer(~3 amps). Personally, if I was still using mine I would add a regulator to the power supply as it has none. I had upgraded most of the capacitors in mine many years ago, this made a very significant improvement to the sound as did upgrading the transformer.

If you send my your email address via private mail I can send you the scans.

Take care,
Doug
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Old 19th April 2007, 02:49 PM   #5
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I've moved this thread to a forum where it is more likely to be seen and get a response.

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Old 20th April 2007, 08:13 PM   #6
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I measured the voltages today:

The transformer is supplying 27.5 volts AC, which results in 36 VDC after the rectifiers. I would guess that a 24 or 25 volt @ 2 - 3 amp rated transformer would be about right.

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Doug
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Old 20th April 2007, 11:35 PM   #7
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Thank you sir. Now I can start doing something. Hopefully not leading to puffs of smoke. <grin>
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