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

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Thread Tools Search this Thread
Old 18th May 2009, 12:41 PM   #1
newtube is offline newtube  United Kingdom
diyAudio Member
Join Date: Mar 2009
Default Another simple se question

Sorry fella's, another question . . .

I have just fired my breadboard simple se up for a lunchtime listen and one channel was louder than the other, seemed fine yesterday. . .
So i swapped speaker wires around and sure enough the louder channel moved too, but after a couple of minutes all was well and balance is restored!?

Is that just warm up time or do i have a problem?

  Reply With Quote
Old 18th May 2009, 12:52 PM   #2
Ty_Bower is offline Ty_Bower  United States
diyAudio Member
Ty_Bower's Avatar
Join Date: Mar 2007
Location: Newark, DE
My Simple SE is equally loud in both channels pretty much as soon as sound begins to come out. I would try swapping the two power tubes with each other and see if the imbalance follows the tubes. If you have a spare 12AT7, I'd try that too.

Try to avoid short-cycling the power switch. If you turn the amp off, let it cool completely before turning it back on.
  Reply With Quote
Old 18th May 2009, 02:53 PM   #3
rknize is offline rknize  United States
diyAudio Member
rknize's Avatar
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
When I have a JJ 12AT7 in there, I hear a similar effect. The amp fades-in gradually like any warming tube amp does, then it seems to stop for a few seconds at a lower volume until it suddenly comes to full volume. It doesn't take minutes as you describe, but it is unusual.

I am guessing it is either some interaction between the input tube and the CCS's or perhaps something with the CCS's when the power tubes come to full conduction and the B+ sags. It seems to happen at different times between the channels and it is much more apparent with the JJs in there.
  Reply With Quote
Old 18th May 2009, 04:01 PM   #4
jörg.s is offline jörg.s  Germany
diyAudio Member
jörg.s's Avatar
Join Date: Sep 2008
Hi Darran,
......... its the same with my SE's.
After three years without any problems i suppose this is common.
I just wait for a quarter of an hour after switching the amps on.
And anything is working fine.
Have fun,
  Reply With Quote
Old 18th May 2009, 08:11 PM   #5
w5jag is offline w5jag  United States
diyAudio Member
Join Date: Feb 2007
Location: Arkansas
The only time I have ever observed a channel imbalance in my Simple SE, it was due to a failing cathode bypass capacitor in the weaker channel.

  Reply With Quote
Old 18th May 2009, 08:55 PM   #6
newtube is offline newtube  United Kingdom
diyAudio Member
Join Date: Mar 2009
I think its the rubbish volume pot i have, at low volume it does it all the time, as soon as its turned up its fine, its the wrong spec and cheap!

I'm ordering a new one from the suggestions in my other thread.
  Reply With Quote


Another simple se questionHide 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
A simple question from a simple man. inteificio Solid State 5 17th October 2005 03:00 PM
Simple Question stoN_Cold Solid State 2 3rd October 2005 10:56 PM
Simple question... Quattor Solid State 7 23rd June 2004 05:41 PM
Simple answer required for a simple question... rabbitz Multi-Way 4 31st August 2003 10:05 AM
A Simple Question OMNIFEX Multi-Way 3 19th July 2003 08:11 PM

New To Site? Need Help?

All times are GMT. The time now is 10:18 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio