Troubleshooting Problem in Tube Preamp - 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 13th February 2003, 09:19 PM   #1
diyAudio Member
 
Join Date: Aug 2002
Location: Miramichi, NB, Canada
Unhappy Troubleshooting Problem in Tube Preamp

Please help try to solve my problem. I just purchased a Dynaco PAS2 Preamp and it worked fine untill one of the tubes seemed to blow, (it was only glowing half as bright as the rest). I replaced it and still have the problem. The problem is I only have half output on the right channel and full output on the left channel. If I use the tape output then I have full output on both channels.

Any suggestions pleassssse.

Clint
__________________
Clint
  Reply With Quote
Old 13th February 2003, 09:30 PM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Measure the DC voltages on the line amp tube from the suspect channel. Post your results and I'll bet we'll all have some good ideas.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 13th February 2003, 11:04 PM   #3
diyAudio Member
 
Join Date: Aug 2002
Location: Miramichi, NB, Canada
All dc voltages are correct as per the owner's manual. Starting to suspect the RCA connectors. Going to replace them tomorrow. I will let you know. Thanks

Clint
__________________
Clint
  Reply With Quote
Old 13th February 2003, 11:12 PM   #4
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default AH....

Hi,

You could be right there...tubes rarely ever die just like that.
Also check for a faulty contact on the selector switch.

If you don't have a copy yet,a manaul for the Pass-2 can be downloaded from:

UNCLE NED.

Keep us posted,
__________________
Frank
  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
Tube preamp, tone control problem Ahmad_tbp Tubes / Valves 17 9th March 2011 11:56 PM
Need help troubleshooting preamp trouble Captn Dave Tubes / Valves 7 19th September 2008 02:18 PM
GainClone troubleshooting, major problem phorensic Chip Amps 6 13th June 2006 02:00 PM
Parasound Preamp Troubleshooting mura Solid State 3 26th January 2005 11:31 PM
Tube preamp problem @mot Tubes / Valves 20 23rd September 2004 07:50 PM


New To Site? Need Help?

All times are GMT. The time now is 03:53 PM.


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