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Apt Holman Pre (mod/ restore)
Apt Holman Pre (mod/ restore)
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Old 28th April 2009, 10:58 PM   #1
swingarm63 is offline swingarm63  Canada
diyAudio Member
Join Date: Apr 2009
Default Apt Holman Pre (mod/ restore)

Greetings all !

Is there anyone here knowledgable about these preamps?

I have one and was wondering if I should hang on to it or sell and get somthing else. There is a slight issue with the volume cutting out from time to time. A few flips of the switches seems to fix it. I have some experince with tube guitar amps, but have none with SS. Is there a best way to proceed with restoring/modding this pre? Does anyone offer a kit that is experienced with this unit? (that would be the easy/lazy way to deal with this : ) Thanks in advance for yor response.
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Old 29th April 2009, 10:43 AM   #2
homemodder is offline homemodder  Portugal
Account disabled at member's request
Join Date: May 2006

I dont have experience with the preamp but I think I remember seeing the schematic somewhere on a thread here, maybe you should do a search for apt holman amp. The schematics should help, also the designer is a member here, check out the apt holman amp thread, he made some comments on the last pages, you could try get some input from him.
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Old 29th April 2009, 11:11 AM   #3
RogerGustavsson is offline RogerGustavsson  Sweden
diyAudio Member
Join Date: Aug 2004
Location: Huskvarna
I have a pdf with the manual. It is 8MB. Downloaded it somewhere but cannot remember where. Maybe here, http://homepage.mac.com/planet10/TLS...nPreManual.pdf

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Old 30th April 2009, 02:01 PM   #4
swingarm63 is offline swingarm63  Canada
diyAudio Member
Join Date: Apr 2009
Found the schematic, thanks. Is there anyone here who have modded these these? If there is, I'd sure appreciate some advice.
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