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-   -   Modding an HK AVR 2550 (http://www.diyaudio.com/forums/parts/95424-modding-hk-avr-2550-a.html)

MatchASM 31st January 2007 10:09 PM

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?

docfin 3rd February 2007 12:36 PM

Service manual for AVR-2550 available here: http://service-manuals.webs.io/

es44 3rd February 2007 02:15 PM

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

MatchASM 5th February 2007 11:13 PM

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 @.

Cal Weldon 5th February 2007 11:14 PM

You are now free to email.

MatchASM 6th February 2007 01:01 PM

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

es44 6th February 2007 03:59 PM

You are very welcome :) Hope you find the "rainbow" you're chasing :cool:

All the best
Ebbe


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