Distorted left channel Proton 520 Amp - 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 18th June 2005, 02:36 PM   #1
allank is offline allank  Australia
diyAudio Member
Join Date: Dec 2004
Location: Sydney
Default Distorted left channel Proton 520 Amp

Hi All

I have a Proton 520 Amp Sound from left channel is slightly distorted.
I noticed transistor Q613 BC640 PNP that drives a Toshiba 2SA1094 heats up in about 4 second it can not be touched its so hot. I measured B= -1Volts, C= -31V
E= -0.3Volts

The right channel transistor Q614 BC640 is fine, measures the following B= + 0.6 Volts
C= - 31Volts , E= + 1.2 Volts.
I donít have a schematic without it, its pretty hard to find what causes the problem.
I removed both BC640 transistors and swapped them, the problem remains.
Any suggestion
Thanks Allan
  Reply With Quote
Old 13th September 2006, 01:41 PM   #2
diyAudio Member
Join Date: Sep 2006
I have two Proton 520's with similar problems. My conclusion is that the poor-quality pots (volume) and pushbuttons (esp. "loudness") that are to blame. I haven't been able to find a schematic or even a manual either.
  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
ppi pc2150 distorted right channel 67elcamino Car Audio 16 29th August 2009 06:46 AM
Distorted left channel - Marantz 2385 jblmar Solid State 2 27th March 2009 05:04 PM
K-502 Left Channel is out udailey Tubes / Valves 3 21st March 2008 05:12 PM
put my pre-amp together and now the left channel is playing distorted :( elizard Solid State 21 4th April 2003 06:23 AM
Help!! Right Channel Freq distorted. TPC Tubes / Valves 3 16th January 2003 02:27 PM

New To Site? Need Help?

All times are GMT. The time now is 10:59 PM.

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