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Old 20th December 2007, 02:36 PM   #1
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Default APT Holman preamp manual, schematic?

Hey all,

Newbie here. Glad to have found this forum as I am puting a "vintage" system together and will be most likely needing some help.

Just purchased an APT Holman preamp, and Adcom 535 amp off of Craig's List. Does anyone have access to schematics and/or owner's manual for the APT Holman pre amp? Can they be bought new? Any "tweaks" for the pre amp?

Thanks!
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Old 5th January 2008, 02:00 AM   #2
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I have an APT, if you remove the cover the circuit diagram is attached to
the inside of the cover.
hth
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Old 5th January 2008, 03:41 AM   #3
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Thanks
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Old 5th January 2008, 03:50 AM   #4
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I have the pdf of the manual on-line but i can't at the moment tell you the URL.

dave
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Old 6th January 2008, 07:52 PM   #5
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Not so much a tweak, but from what I've seen on the net, the mute
circuit is the problematic area of this pre-amp. Thats why I know
where the schemo is, as mine is suffering from this issue. Haven't had
the time to trace thru and fix it yet. Otherwise and outstanding pre-amp.

sealevel
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Old 7th January 2008, 12:39 AM   #6
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Apt Pre Manual

http://p10hifi.net/planet10/TLS/down...nPreManual.pdf

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Old 7th January 2008, 12:41 AM   #7
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Thanks!

Good resource..
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Old 7th January 2008, 07:40 AM   #8
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sealevel, if the mute circuit is causing a channel (or both) to drop out, here's the factory fix (i worked as the customer service tech at APT for a few years):

1)remove the cover from the relay
2) put a piece of brown paper bag between the contacts of the relay
3) hold the contacts closed and use the brown paper to burnish the contacts.

4) reassemble the relay
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Old 7th January 2008, 07:45 AM   #9
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Quote:
Originally posted by unclejed613
here's the factory fix]
Good trick.. i've had that problem with a couple of the APTs i've had thru here... (i maganged to recover from them by repeatedly toggling the mute switch.

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Old 7th January 2008, 10:36 AM   #10
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I always used a burnishing tool and then ran paper thru the contacts to clean. May be better just to replace the relay in the long run.
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