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In Reply to: RE: Serious Micro-Phonics and Hum from Citation V posted by mr9iron on July 07, 2012 at 15:00:22
I suspect some trafo rewinding is in your future I'm afraid. But the unit is worth it!!
But maybe it's something else, so I'll keep my fingers crossed!!
Follow Ups:
Jim, is that due to them needing some wax like potting to dampen the wire like is done with guitar pickups? I'm guessing done with tar instead.
Edits: 07/07/12
Danny,
The insulation on the wires and the wires themselves can both fail. The windings are subjected to repeated heating/cooling cycles, they move ever so slightly as a result of expansion/contraction from heat, and from magnetostriction; and if there are any solder joints inside them they can work harden. See the pic of a Cit II trafo I posted as an example of an internal wire failure. This pic is of a power trafo but the failure can occur in an OPT too.
Keep in mind too that magnet wire now is FAR better, especially the insulation.
BTW, getting Cit V trafos rewound is significantly less than getting Cit II trafos done since the V's aren't potted. I wouldn't rule out keeping the amp - but Triode Kingdom's offer is nice to see - this particular amp's life is FAR from finished!
Oh - the potting material used in a Cit II is called "permafil" it's a mixture of tar and ground slate.
wow, that would be very serious, what would cause this? I thought that the windings are very "inert" and if they are wound and stable through their life they would not "wear" out..
J
Man, I hope you find it and don't have to incur the high price of a rewind. That would be heart breaking.
Danny,
I am not sure what I'll do if that's the case. I'd probably sell it for parts, it's all new.. It wouldn't be hardly worth it to re-wind the transformers.. I have another one I could upgrade and just call it a learning experience..
J
I hope this works out OK for you. If not, and you do indeed decide to sell this for parts, I'd like a crack at it. Please keep me in mind.
--------------------------
Buy Chinese. Bury freedom.
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