In a message dated 6/6/99 12:01:20 AM Eastern Daylight Time, jess@magenta.com
writes:
<< What is the the common way in which the HV transformers fail? Is there a
certain winding that gets shorted turns from the heat?
I think that this has been talked out before, but would replacing the
small T0-220 cased +/- 24V regulators with larger T-03 versions ( and
eliminating the big hot resistors) help to preserve the HV transformers?
>>
Not really. The red HVT's failed because of moisture that was in the large
spools Amplifone used to wind the HVT's. You'll have to read the "History"
section of my Amplifone HV faq for details and a further explanation. (Yes,
the faq should be done soon!)
I suggest using the 1.5 amp rated 7824cv and 7924cv, instead of the 1 amp
rated originals. These are a TO-220 case. There is alot of info about this in
the Amplifone HV faq...
However, a T03 case would make little or no difference in this case - the
failure is in the red HVT, not the VR's. Though the T03 generates a bit less
heat, this makes little or no difference if your red HVT is a bomb waiting to
go off...
Michael Kelley
Received on Sun Jun 6 20:12:29 1999
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