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Old 30th May 2003, 06:36 PM   #1
zoobie is offline zoobie  Canada
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Default a hundred questions from a noob

hi all. I just picked up a cheap H/K PM665 from a guy who knows even less about electronics than me. I have a few questions about it - there seems to be some weirdness with the balance and the bass contour switches. I don't know - maybe I should replace both? Where is a good place to buy them from?

If I want to mod this amp, where is a good place to start?

Here are the internals. It looks pretty mean, but wtf do I know. :

Thanks in advance for helping another noob enter the hobby.
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Old 30th May 2003, 09:37 PM   #2
zoobie is offline zoobie  Canada
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here is what the bass contour switch looks like:
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Old 30th May 2003, 10:48 PM   #3
Netlist is offline Netlist  Belgium
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Hi, zoobie
What a beauty!!!
I guess the contacts from the switches are dirty or maybe worn out.
Look at the solderings of the pots and switches and redo them if necessary. Be prepared to remove a lot of screws, and remember where which screw fitted. Make a drawing.

I wont be an easy task to find replacement pots or (and) switches, unless you can order them from HK.
The best thing to do is replace them, if the solderings are ok.
You could try "contact cleaner", but it would be a shame to blow that spray in such a nice amp. Personally, if I have no other choice I used that spray in very small amounts. There is also a second spray, which washes away the "contact cleaner". Only consider this as a last resource!

Don't hurry; take your time. It's a very nice amp.

/Hugo
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Old 30th May 2003, 10:55 PM   #4
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Looks nice

you can get owners manuals and such from here
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Old 31st May 2003, 02:28 PM   #5
zoobie is offline zoobie  Canada
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Thanks alot for the help!
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Old 31st May 2003, 03:04 PM   #6
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You can get the service manual + schematic here:

http://manuals.harman.com/hk/Service...pm665%20sm.pdf
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