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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: McIntosh Mc225 Transformer failure posted by Pyfite on December 19, 2005 at 07:33:55:
Ouch,You may want to investigate further...even to the extent of swapping channels with respect to the transformer connections or resistance readings from one phase to another. This is a pretty serious diagnosis.Megging out the transformer will tell.
I'm not sure of the close packing having much to do with it. However, age/heat/dc is known to breakdown the varnish on the windings as materials used back then don't duplicate the dialectric strength of the laquers available now.
Check your coupling capacitors too they should be changed and could be causing this. Assuming it is your transformer and not a loose tube socket, capacitor passing dc or resistor in the the plate or cathode circuit cracking up you are in for a expensive repair.
I'd just go the Audioclassics route if the transformer there is in good shape. Getting it rewound will cost the 400-$700 and then it's not got the "charm" of the vintage transformer. Then again I once bought a used Quad II power xfmr from a "reputable" dealer and it was perculating dud with no response for a return...you take your chances. Make sure you get a return option of sorts.
That said, the MC225 is one of my favourite vintage amps. Sweeter than the Marantz 8b and finer than the Citation II to my ears and I have both of those too. It's worth saving, believe me. There is not much out there,if you can live within its power limitations, that will touch it for many times the price...not even the awful MC240(6l6's yech YMMV) or the vintage MC275...Now the new MC275 looks to be a good deal new for the $ but I've not heard one yet. Fix it up!
Good Luck with it.
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Follow Ups
- Re: McIntosh Mc225 Transformer failure - AJ 12/19/0518:29:49 12/19/05 (0)
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