Puzzler - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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
Reply
 
Thread Tools Search this Thread
Old 26th April 2007, 04:36 AM   #1
krzanik is offline krzanik  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Austin, TX
Question Puzzler

I just completed a single ended 6V6GT amplifier. I followed the schematic correctly (so I think) but when I turn it on I get music from one speaker but not the other. The really weird thing is when I turn it off I get music from both speakers for a few seconds (before the amp powers off completely). If I quickly turn it on again I get music from both speakers for a few seconds and then one fades away leaving one channel with music. Is this indicative of a particular problem? I'm so confused. Any help would be greatly appreciated.
  Reply With Quote
Old 26th April 2007, 01:01 PM   #2
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
I saw this problem before. In my case the resistor from the grid of the output tube to ground (or the bias supply) was open (physically broken). I suppose that this could happen in any stage. Check the resistances to ground through each stage in the amp. Just compare the good channel to the dead channel. Make sure the power is off and all electrolytic caps are discharged.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 26th April 2007, 06:15 PM   #3
krzanik is offline krzanik  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Austin, TX
Default Puzzler

Thanks for the information. I figured someone would have had this happen before. I'll try to check the dead channel out tonight and see what I find. I hope your right and it's simply an incomplete connection.
  Reply With Quote
Old 27th April 2007, 12:47 PM   #4
krzanik is offline krzanik  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Austin, TX
I checked out the dead channel last night and couldn't find anything wrong with it. Finally I replaced the 12AX7 with a new one and both channels seem to work fine. The origonal 12AX7 was a used old stock RCA that I guess wasn't working.

Thanks for your help.
  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
CS800 puzzler..... unclejed613 Solid State 1 12th August 2007 10:50 PM
Puzzler!! Using 3 amps w/ 1 pair speakers ransom peek Solid State 11 18th March 2005 04:50 PM
Today's Puzzler ?? sam9 Solid State 17 31st January 2004 10:25 PM


New To Site? Need Help?

All times are GMT. The time now is 11:04 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