Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Marantz MA500 mod
Marantz MA500 mod
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 20th July 2009, 04:22 PM   #1
kst is offline kst  Singapore
diyAudio Member
Join Date: Jan 2005
Location: Singapore
Default Marantz MA500 mod

Hi all,

Just get hold of a pair of Marantz MA500...
Thinking of doing a simple mod by changing the output transistor and some cap along the signal path....

Original output transistors used is 2SC3280/2SA1301.
Thinking of changing them with 2SC5200/2SA1943 higher power compared to original parts used.

BUt the 2SC5200/2SA1943 hfe classification is "O" type, the original part has hfe of "R" type.

Not sure if this modification still worth it.....
And not sure if the different hfe classification will create problem...

Any advice ? Any other mod that I can try ??

Many thanks in advance.
  Reply With Quote
Old 20th July 2009, 09:11 PM   #2
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
There is no point in doing much with this amp except perhaps replacing the 4.7uF 50V input capacitor with a polyester type.

Don't bother replacing the output transistors unless they are damaged. The original 2SC3280/2SA1301 are quite capable, they are the "baby brothers" of the wellknown 2SC3281/2SA1302 devices.

The heart of this amp is the UPC1342V. If that dies, the amp is history - you will have a lot of difficulty getting another one.
  Reply With Quote
Old 21st July 2009, 12:04 PM   #3
east electronics is offline east electronics  Greece
diyAudio Member
east electronics's Avatar
Join Date: Jan 2006
Location: Athens GREECE
Default 100%

agree to that ....

the sound of these original pairs is unbetable .... see if you have any caps to be replaced ....
  Reply With Quote


Marantz MA500 modHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Marantz MA500/U service manual please KevinLee Solid State 19 24th April 2009 05:31 PM
Marantz MA500, only 50Hz output? kaspro Solid State 21 23rd September 2008 07:36 PM
Right speakers for Marantz PM8000 + Marantz CD67-OSE? betto80 Multi-Way 2 24th May 2005 03:21 PM
FS: Marantz MA500 project modules TheDamonator Swap Meet 3 22nd March 2005 06:32 PM
Link Between Marantz CD12 and Marantz CD99 Mesh Digital Source 16 7th November 2003 06:08 PM

New To Site? Need Help?

All times are GMT. The time now is 12:14 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio