Harman-Kardon PM 665 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th May 2006, 12:46 PM   #1
sangram is offline sangram  India
diyAudio Member
 
Join Date: Sep 2002
Location: India
Default Harman-Kardon PM 665

Hi

I have this vintage amp, at least 20 years old and has been through a few owners. I myself have had it for about three years, in which period I must have used it regularly for about a few months only.

Now the amp has a huge turn-on thump and a large amount of DC offset is passed on one channel. I might mention that at some point this had been plugged into a 230 volt mains (the amp was supposed to run off 120v), blowing some of the driver transistors. After getting some custom-wound EIs and replacing a couple of drivers, we adjusted the bias point and all was good.

Now it takes a long time to switch into operating mode from standby, and once it does promptly passes about 15 volts of DC through its left channel. The switches are all a little noisy and scratchy, and the case is not in the best of condition, the very thick front panel is partially bent and some of the plastic inalys have broken off.

It'll cost me about $100-150 to go get it fixed, the way I see it, maybe more. One of the PS caps was sparking badly, I should probably replace all of them, maybe all electros and microswitches, and the failed transistors.

Q: Is it worth it? It sounded quite good when I had it, and had speaker-bottoming power. Some nice output transistors (4 pairs of 3281/1302 - Originals as far as I can tell) and very beefy 400 VA 38 volt EIs, but not much else of value. I probably will need to dump it or give it away to charity or something if it's not.
  Reply With Quote
Old 17th May 2006, 07:32 AM   #2
sangram is offline sangram  India
diyAudio Member
 
Join Date: Sep 2002
Location: India
Hi, anyone?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Harman Kardon AVR 10 halloweenguy Everything Else 6 1st February 2010 06:52 PM
Harman Kardon HK 770 argonrepublic Solid State 17 7th November 2009 05:45 AM
For Sale Harman Kardon T60 Turntable / Harman Kardon Cd491 Cassette Deck electric blue Swap Meet 1 26th August 2006 12:36 AM
Harman Kardon amp Ilianh Solid State 10 26th December 2005 04:27 PM
Harman Kardon amp RancidAltoid Solid State 0 10th February 2005 01:28 AM


New To Site? Need Help?

All times are GMT. The time now is 02:31 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2