"jakdedert" wrote in message
.. .
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. So
I think I will button the unit up, and for now keep it on 'Monitor' and use
an external tuner on the monitor inputs. There is no hum when using
Monitor.

Yes this unit is a relic and in fact purchased by my wife new in the early
70's. Perhaps not worth the service fee for repair, but it provides a
connection to the past so I'll keep in for her a bit longer.

Thanks again.

John