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Any info on a VSP Trans Mos ?

24.4.202.156
Posted on October 6, 2014 at 09:52:52
Tom B.
Audiophile

Posts: 4355
Joined: October 5, 1999




A friend of mine just gave me his mid 80s VSP Trans Mos MosFet power amp and I'm attempting to find a schematic or any other piece of info on the amp. It's built incredibly well. I'm not sure if it's 200 Watts of 150 Watts. The idea behind getting this amp is for a possible future Electrostatic audio system.

I did a quite a search on Google and came up with some very old postings of VSP owners circa 2003 through 2007 and none of them were having much luck. It reminds me of my search for the joker who owned PSE. I never was able to connect with the fellow for a possible schematic for my Studio II power amp.

Any help would be appreciated.

Tom B.

 

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RE: Any info on a VSP Trans Mos ?, posted on October 6, 2014 at 13:34:50
unclestu
Dealer

Posts: 5851
Joined: April 13, 2010
 Yours looks to be the first model and was rated at 150 watts. But then I could be wrong.

I have a 200 wattr sitting here too (acrylic faceplate). and also am in search of schematics. IIRC much of the issue was with the servo bias circuit.... But that is not any where I have expertise in.

If you do find anything I would appreciate if you shared the info and I certainly will do the same.

Incidentaly FWIW the address for VSP was idential to the old DCM factory ehich was in Ann Arbor, IIRC.

 

RE: Any info on a VSP Trans Mos ? Will do ....., posted on October 6, 2014 at 20:00:22
Tom B.
Audiophile

Posts: 4355
Joined: October 5, 1999
 ....pass on any info I can dig up.

Tom B.

 

RE: Any info on a VSP Trans Mos ?, posted on October 7, 2014 at 10:33:14
boboli
Audiophile

Posts: 997
Location: Phoenix Arizona
Joined: May 12, 2005
 I had one exactly like that. I still have the manual, which I believe has the schematic. I'm on vacation now, but will be home in a few days and I'll check, if you'd like.

 

RE: Any info on a VSP Trans Mos ?, posted on October 7, 2014 at 12:35:37
Tom B.
Audiophile

Posts: 4355
Joined: October 5, 1999

wow.............that would be awesome!! I would appreciate that big time brother. A simple copy would suffice. Whatever way you want to go will be fine.

Tom B.

 

RE: Any info on a VSP Trans Mos ? Will do ....., posted on October 8, 2014 at 08:00:09
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001
 I have one too. Can I get in on this? I used it for years. It was a very nice amp. It lost a channel and non of the local shops wanted to touch it. Now I have the capabilities to work on it, but a schematic would make life a whole lot easer.

Dave

 

And then I did an internet serach, posted on October 8, 2014 at 08:16:15
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001



And found the Power Supply.

 

RE: And then I did an internet serach, posted on October 8, 2014 at 08:17:44
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001



And the input.

 

RE: And then I did an internet serach, posted on October 8, 2014 at 08:22:53
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001



And the output.

 

RE: And then I did an internet serach, posted on October 8, 2014 at 08:25:10
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001



And the mute sensor.

 

RE: And then I did an internet serach, posted on October 8, 2014 at 08:26:47
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001



And the schematic. Of course a more specific schematic would still be helpful!

Dave

 

RE: Any info on a VSP Trans Mos ?, posted on October 8, 2014 at 08:36:10
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001
 Here is a link to your particular amp.

Dave

 

RE: A Big Thankyou !, posted on October 8, 2014 at 15:00:30
Tom B.
Audiophile

Posts: 4355
Joined: October 5, 1999
 That's great Dave ....thanks much!!!

 

RE: A Big Thankyou !, posted on October 9, 2014 at 10:57:52
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001
 I have one too, so it helped me a lot! I really liked that amp when it was running. Smooth and very powerful. I was working in audio when I bought it. I A/Bed it with an Adcom GFA-555. I liked the VSP a lot better in my system, with the exception of the very low bass, but the improvement in bass was not enough to tip the balance, even though I could have bought the Adcom at cost.

Dave

 

Thanks all !!, posted on October 10, 2014 at 19:59:58
unclestu
Dealer

Posts: 5851
Joined: April 13, 2010
 and damn I'm on Vinyl engine but haven't checked the site recently, Double damn, as now I don't have an excuse for not working on the amp.

One Interesting observation in comparing Vinyl Engine schematics to other one posted. In Rev C, on VE, the notes indicate that about 6 diodes were reversed in polarity for the +/- 15 volt power supply. That's a major gaff and might be a good point to start.

But thanks to all.....

 

RE: Any info on a VSP Trans Mos ?, posted on October 12, 2014 at 16:50:47
boboli
Audiophile

Posts: 997
Location: Phoenix Arizona
Joined: May 12, 2005
 I am back from vacation and looked in my files. I have a fair amount of literature. There is an owner's manual with one schematic, a revised owner's manual. preliminary literature and even my results when I had it tested at a McIntosh Amplifier Clinic in 1990. I can copy any or all of it.

 

RE: Any info on a VSP Trans Mos ?, posted on October 13, 2014 at 10:36:23
Tom B.
Audiophile

Posts: 4355
Joined: October 5, 1999
 Kind Sir,

I would greatly appreciate a copy of everything you have on the VSP. I have plans to get the entire amp re-capped and if possible, modified if possible. I have a a world class technician that can do miraculous things if given the opportunity. Lol.....everyone is getting older, I need to get said technician on the project before he retires next year!

I guess we should contact each other. I believe you can get to me with an e-mail provided on my AA page under my moniker.

Thanks Again, Tom B.

 

RE: Any info on a VSP Trans Mos ?, posted on October 13, 2014 at 13:27:51
boboli
Audiophile

Posts: 997
Location: Phoenix Arizona
Joined: May 12, 2005
 Can't seem to find your email address. Mine is oly11@cox.net.

 

RE: Thanks all !!, posted on October 13, 2014 at 19:48:26
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001
 All I can tell you is that when my VSP was running, it was one sweet sounding, very powerful amp.

Dave

 

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