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Help with dead PM-1200

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audiohacker

Newbie

Posts: 4

Joined: Fri Dec 31, 2010 12:04 pm

Post Thu Feb 24, 2011 12:47 am

Help with dead PM-1200

(This was originally posted in The Welcome Mat... probably not the best place. What can I say, I'm new here!)

A friend of mine asked me take a look at her PM-1200. She was using it as a PA amp in a club, and it failed with copious smoke. I wasn't there, but I'd bet some band cranked it up until the distortion was unbearable, then backed off just a touch.

I opened it up, and it looks to me like the power transformer is fried - some of the windings look blackened. When I power it on, nothing happens, except there are soft crackling/popping/ticking noises from the power transformer itself.

Now, I'm not bad with tube gear, and I've had some limited success repairing solid state amps, but I found the manual and schematic, and clearly this thing is a little out of my league, so I'm hoping for some good advice from the collective wisdom here. I'd appreciate any answers to these questions....

  • Is this even repairable? Are parts available? How much beyond the transformer is likely to be toasted?
  • If it's repairable, is it worth it?
  • Is it something someone like me (with substantial general electronics knowledge but no experience with Carver designs) could repair, or is this strictly for the Carver specialists?
  • Is it worth anything in its present condition? Are there Carver enthusiasts who would want to acquire it on the cheap with the hope of repairing it themselves?
  • Or is it just e-waste?
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TNRabbit

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 13301

Joined: Sun Jan 14, 2007 11:53 am

Location: TN Native Languishing in VA

Post Thu Feb 24, 2011 4:20 am

Re: Help with dead PM-1200

It is my understanding that transformers for these are unobtanium, but I defer to one of our resident techies....
TNRabbit
Image

From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.
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kingman

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 5634

Joined: Sun Nov 30, 2008 2:10 pm

Location: Upstate South Carolina

Post Thu Feb 24, 2011 7:46 am

Re: Help with dead PM-1200

I would think it's pretty much waste. Maybe a few parts could be salvaged but the professional amps have all usually lived a hard life and not many use them for home systems. :-({|=
In reality, it only matters what it sounds like to YOU!!!
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TNRabbit

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 13301

Joined: Sun Jan 14, 2007 11:53 am

Location: TN Native Languishing in VA

Post Thu Feb 24, 2011 8:09 am

Re: Help with dead PM-1200

Someone here who owns a 1200 might buy it for parts....
:-#
TNRabbit
Image

From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.
<<

byacey

Newbie

Posts: 5

Joined: Tue Apr 12, 2011 12:21 pm

Location: St. Albert, Alberta, Canada

Post Mon Apr 25, 2011 11:18 am

Re: Help with dead PM-1200

These transformers can be rewound by someone with experience. It's important to get the windings tight and use really thin cambric film as there isn't a lot of room in the core window opening.

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