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.

Technics SU8044
Technics SU8044
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, 10:36 AM   #1
Carlosraj is offline Carlosraj  United Kingdom
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


Technics SU8044Hide 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
Technics SP10 haydn Analogue Source 10 27th October 2011 02:18 PM
Technics Info drayhn Solid State 0 28th January 2011 04:30 AM
IC for Technics seoded Chip Amps 2 6th July 2009 02:04 PM
Technics 1500 inanimatecarbon Swap Meet 0 15th June 2005 11:21 PM
DJs and Technics davesaudio Analogue Source 2 3rd November 2004 01:46 AM


New To Site? Need Help?

All times are GMT. The time now is 11:13 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki