Technics SU8044 - 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 11th February 2013, 11:36 AM   #1
diyAudio Member
 
Join Date: Jan 2010
Default Technics SU8044

Dear Friends,

A friend gave me a Technics SU8044 to repair. I noticed that both the power ICs (STK0039) have blown. I replaced both the ICs. Our mains voltage is 240 volts AC, I am using a Variac. I set the voltage at 100volts AC and switched "ON" the amplifier. The amp works perfectly well. Now as I turned up the AC voltage slowly, I noticed that at around 150 volts AC, the sound becomes intermittent. It comes on for a few seconds then goes off for a few seconds, and it keeps repeating this. As I turn the voltage even higher, the ON and OFF period gets even longer. When I set at 240 volts, the sound doesn't come on. If I reduce the voltage to 150 to 80 volts AC, It works fine. Can someone please give me a clue what can be wrong.

Thanks


Carlos Rajoo
  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
Technics SP10 haydn Analogue Source 10 27th October 2011 03:18 PM
Technics Info drayhn Solid State 0 28th January 2011 05:30 AM
IC for Technics seoded Chip Amps 2 6th July 2009 03:04 PM
Technics 1500 inanimatecarbon Swap Meet 0 16th June 2005 12:21 AM
DJs and Technics davesaudio Analogue Source 2 3rd November 2004 02:46 AM


New To Site? Need Help?

All times are GMT. The time now is 10:04 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