Curt Nixon <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hi Evan:
On the transformer buzz...the bolts are a way--sometimes they get
loose. Rather than the rtv tho..I guess I would look for an industrial
motor repair shop that rewinds big motors--they will more than likely
have a vacuum varnish tank for impregnating windings. They would
probably dip your transformer in the tank for next nothing (perhaps a
box of danish for the crew!).
THe varnish will secure any loose windings AND lamination voids that can
make noise. Place shrink tubing over the leads and shrink it. you can
cut it off afterwards so the leads are not too stiff.
I've also seen the case vibration resonance mentioned and the rubber
wedge can fix it if that is the problem--if it is, you can tell by
placing yopur hand on the case to kill the vibe. DOn't obstruct airflow
with large foam pieces tho.
FWIW
Curt
KU8L
[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] made an utterance to the drakelist gang
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Joe,
I've rebuilt an number of L4B supplies and have found in several cases of
hum, it was caused by a mechanical "resonence" if you will between the outer case
and the transformer core. Reshaping the case or putting stiff foam rubber
between the case and core can help. While I've not done this on an L4PS, I have
cured hum on some other transformers by flowing flowable RTV onto the
windings, from above, let it cure, then from below. Sometimes it works, sometimes
not, but only if a winding is loose. The flowable RTV is sold as windshield
sealant for cars and is flowable where standard RTV is not. If a lamination is
loose, then tightening the bolts might help.
73,
Evan
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