SE amp problem - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 31st October 2010, 06:05 PM   #1
diyAudio Member
Join Date: Dec 2007
Default SE amp problem

I just finished my first project. An all tube SE kt88 guitar amp with reverb. When I turned it on everything sounds fine, but when I turn the master volume above one quarter it starts to produce some audiable high frequency oscillation through the speaker,and a moment after that something starts to hiss in the amp head (I think it is the OT). I also noticed that if I turn the reverb full on, and the master volume just below the oscillation, then if I turn the reverb lower it starts to oscillate again.

Any ideas?

  Reply With Quote
Old 31st October 2010, 08:54 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
kevinkr's Avatar
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
How about pictures of build and schematics to start, and then we might have some ideas of what to tell you..

Symptoms you describe sound like oscillation, but without the above information we can't tell you anything useful.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  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
2A3 SE Problem mark02131 Tubes / Valves 7 20th February 2010 06:14 PM
Tube Lab SE Problem Doc Jr 8156 Tubes / Valves 25 11th November 2009 08:08 PM
Simple SE - one channel intermittent problem astrodog Tubelab 15 25th May 2009 03:27 PM
Chasing my Simple SE problem... Zap Tubelab 9 15th October 2008 03:53 AM
Humming problem with 5687? SE amp design. G Tubes / Valves 7 21st February 2003 12:59 AM

New To Site? Need Help?

All times are GMT. The time now is 04:07 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