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Old 31st January 2007, 10:09 PM   #1
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Default Modding an HK AVR 2550

A friend of mine has a Harman/Kardon AVR 2550 and we're considering adding PSU capacitance and replacing the coupling capacitors with MKT/MKP type units.

There are a couple of questions I have with this amplifier:

- The transformer gets pretty warm; is that a matter of bad design?
- Each channel's own amplifier has a large number of electrolytic caps; I wonder why (I don't have a service manual to quickly look it up). I would expect one decoupling cap, and two power supply buffers, but what are the other caps doing on the PCB?

Also, any other suggestions for mods on this amp?
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Old 3rd February 2007, 12:36 PM   #2
docfin is offline docfin  Europe
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Service manual for AVR-2550 available here: http://service-manuals.webs.io/
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Old 3rd February 2007, 02:15 PM   #3
es44 is offline es44  Denmark
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MatchASM, if you need the service manual, you'll get it for free from me
Just PM me with a valid email address.

best regards
Ebbe
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Old 5th February 2007, 11:13 PM   #4
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Quote:
Originally posted by es44
MatchASM, if you need the service manual, you'll get it for free from me
Just PM me with a valid email address.

best regards
Ebbe
I guess it's not possible to PM while under moderation?

I have a Gmail account with my nickname before the @.
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Old 5th February 2007, 11:14 PM   #5
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Old 6th February 2007, 01:01 PM   #6
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Quote:
Originally posted by Cal Weldon
You are now free to email.

Thanks.

And Ebbe: thanks for the manual.

Now for some serious DIY-ing... :-D
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Old 6th February 2007, 03:59 PM   #7
es44 is offline es44  Denmark
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You are very welcome Hope you find the "rainbow" you're chasing

All the best
Ebbe
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