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Carver power amp transformer!

8/18/2003 4:31 AM
Matt Ross
Carver power amp transformer!
I have 2 Carver 1.5 power amps with blown transformers!!  
Does anyone have a source for these?  
Carver doesn't carry them anymore!!  
8/19/2003 3:57 AM
Don Symes

If the cores are in good shape, is Carver willing to tell you about the numbers of turns and gauges and such?  
That'd let you rewind 'em ... or get 'em rewound.  
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8/29/2003 9:39 AM
steve conner

If the transformers are blown, surely you can just dismantle them, count the turns, and rewind them yourself? That is a big job, though, and you're not likely to be able to do it well enough to meet the thousands of safety regulations now in force :(
9/6/2003 6:55 PM
Rick Erickson

Are you certain it's the transformers? Carver ususally used a triac to supply controlled AC to the primary winding. If this triac shorts it will act like a shorted primary and blow the mains fuse.  
If the transformer is blown you will either have to have it custom rewound or maybe find a replacement through one of these links.  
- Vetco bought a bunch of surplus Carver chassis & parts several years back. I don't know if they have any of it left but it wouldn't hurt to ask. I scored a 3lb coffee can full of Carver (Motorola) C2000 T0-3 power transistors that the owner, (Warren) had tossed in the garbage can for some reason. My friend Bob Munger (ex Altec-Lansing engineer, transformer designer/builder etc.) who works there told me they were there and suggested I take them before Warren came to his senses... They appear to be MJ15003's or something similar. I've used them as replacements in Phase Linear 400's and Crown D-300 amps with no failures.  
9/6/2003 7:12 PM
Mark Black

I second what Rick said about making certain it's really bad transformers. I've worked on quite a few of these (geez - it might be near 50) and their later incarnation the PM-1200, and have yet to find a single bad transformer.  
What I do find routinely is:  
Solder crack at output transistor sockets (sometimes invisible - I always retouch them all).  
Solder crack at the multipin amp card connectors (same as above).  
Solder crack at (ironically) the only capacitors they glued to the amp cards.  
Bad diodes (MR852's usually - if your amps have them in the main power supply section they should be replaced with 6A10 types as per a Carver service bulletin).  
Bad multi-section caps in the intermediate rail supply (no longer available but Phoenix Gold still sells a retrofit kit).  
Lots of other things but this is getting way too long.  
Just never a bad transformer yet...  
Good luck!
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