Receiver has a hum - Harmon Kardon 230A
On Mar 6, 9:00*pm, "JohnC" wrote:
"Tim Schwartz" wrote in message
news:MnSyj.5598$dB.2154@trnddc01...
Mark D. Zacharias wrote:
"JohnC" wrote in message
. ..
"jakdedert" wrote in message
t...
Mark D. Zacharias wrote:
(Just where are those outputs, anyway?)
jak
The outputs are those little black bridge rectifier-looking things
attached to the rear panel. I once subbed a set of 2SD313's for them,
but the basing is the reverse of a TO-220 package, if memory serves.
This model was one of my earliest "wiz-bang" repairs where I had to
improvise to get the thing running. Even in 1985 or thereabouts there
was no support from Harman on this model.
Which goes back to the question, is there some compelling reason to
want to fix this thing? It's probably not even worth the effort unless
you just need it to fill out your HK collection - they were pretty
rare.
Mark Z.
The OP stated that he's had it since new, so I'd guess a fairly strong
sentimental attachment.
jak
Thank you all for your assistance and suggestions to help me with this
hum problem. *I opened it up again today and removed the front too to
better inspect connections on the front panel. *With the unit on, I
tapped all over the unit with a non-conductive tool. *I was unable to
have any effect on the hum. *I loosened and tightened many screws.
Especially those that appear to provide some grounding. No change. *I
found no connections that appeared suspect.
I suppose the next step is to test the caps with an ESR meter. *This is
probably beyond my ability and will involve the purchase of such a unit.
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