How to improve an old marantz pm-55 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 22nd June 2010, 02:01 PM   #1
edusub is offline edusub  Spain
diyAudio Member
Join Date: Apr 2010
Default How to improve an old marantz pm-55

Hello everybody,

I just bought for a low price an old Marantz PM-55 not 100% OK but enough to perform some mods on it and fix it for a second equipment.

First question: what improvement could I get by changing the original ELNA caps 8200uf, 56V ? Which would be the best replecement for them (in an average budget, not spending too much)?

Second: I have noticed a crispy and intermitent cracking noise in the right channel, both in the two system outputs (PM-55 has exit for two sets of speakers). I have got the service manual but don't know where to look to find the origin of this default in the righ channels. Left channel in the two speaker sets work OK.

Thanks for any help you could provide.

  Reply With Quote
Old 16th July 2010, 06:17 AM   #2
hew128 is offline hew128  Singapore
diyAudio Member
Join Date: Jan 2006
Location: Singapore

I have a PM-45 and sounds like same problem. Notice the cracking sound occurs more often when I touch the casing e.g leaking current.

Don't suppose you have made any progress on it since the post?

  Reply With Quote
Old 16th July 2010, 07:37 AM   #3
diyAudio Member
east electronics's Avatar
Join Date: Jan 2006
Location: Athens GREECE
the articular amp has room and step for a lot of changes how far and what to improve is only up to you

importand to notice is that improvemnts of any kind will alter the safety margins of the amp ...that is rule #1 and you have to live with that ...

then again improvemnts of anykind will have small percentage of benefit 2% here 3% there and so on ...importand is to think that 10 improvements of 3% each will sum to a result of almost 30% of total improvemnets yes it worth the idea playing arround ...

schematic is available e mail me if you like to have it ... and following that i could give you a wish list of the things i would change or try ...

kind regards sakis
  Reply With Quote
Old 14th September 2014, 08:10 AM   #4
hew128 is offline hew128  Singapore
diyAudio Member
Join Date: Jan 2006
Location: Singapore
Took a while.

The issue caused by loose solder joints on the transistors on my unit.
  Reply With Quote


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
Marantz PM 440 and PM 351 Schematic required Krokotam_ Solid State 0 22nd October 2008 07:36 AM
marantz PM-66SE kinvig Solid State 2 2nd April 2008 11:46 PM
Marantz PM 75 Mat Solid State 6 20th January 2006 06:54 AM
Marantz PM 55 elec972 Solid State 0 6th December 2005 11:57 PM
Marantz PM 55 schematic !!! Help me pioneervn Solid State 3 10th September 2005 06:42 AM

New To Site? Need Help?

All times are GMT. The time now is 11:41 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2