Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Tube Amp Help?
Tube Amp Help?
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 25th July 2002, 04:52 PM   #1
FBJ is offline FBJ  United States
diyAudio Member
Join Date: Mar 2002
Location: USA
Default Tube Amp Help?

Brought a pair of VTL Tiny Triodes mono tube amps about 11 years ago and I still have them but have not used them in about 2 years. I have traveled alot over the 11 years carrying the amps with me in the original padded cardboard box.
Well about 4 years ago I pick up one of the amps and hear something rattle in side. After I open the amp, which was very hard, what happen was the power supply filter Caps broke off from the thru hole pins or lugs.
Looks like the pins or lugs of the Caps were too thick to fit all the way inside the PCBs round pad holes so RTV was used to hold the caps in place. But I guess over the years the RTV dried out and peeled away and no support for the Caps. So I figure the constant traveling and transporting of the amps in the box caused the Caps pins or lugs to break away from the PCB.
I smashed each pins or lugs of the Caps (not to each other) untill each lug would fit back in the original PCB holes. First I fixed one amp (channel) at a time and when I assembled the first amp I used the second amp or channel as a guide for wiring the amp I fixed.
Okay now for my problem. One amp (channel) works fine but the other amp sounds fine at first but after 1 to 2 minutes the volume drops to a very low level as heard over that speaker. I have checked both amp visually, wiring and connections, used different speakers but I get the same result.
Anybody got an idea?
  Reply With Quote
Old 26th July 2002, 11:43 PM   #2
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
SHiFTY's Avatar
Join Date: Jul 2002
Location: New Zealand
Check all your tubes are properly seated, swap them from the working amp to the non working amp, check your input jacks for corosion, attach signal to different stages in the circuit and see if you can narrow the problem down...

did you try replacing the caps? They might be faulty inside....
  Reply With Quote
Old 29th July 2002, 04:23 AM   #3
FBJ is offline FBJ  United States
diyAudio Member
Join Date: Mar 2002
Location: USA
Thanks ShiFtY,
I had done the other things you mention but not the new caps. That maybe it though, I will try it.
  Reply With Quote


Tube Amp Help?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
need diy tube preamp (line-stage) recommendation and general tube advice Musiclover4 Tubes / Valves 16 18th May 2013 03:19 PM
FS tube tuner, Active filter kit, tube amp, amp3 Josephjcole Swap Meet 9 20th July 2007 04:05 PM
SS or tube voltage amplifying stages in an amp with tube output? ray_moth Tubes / Valves 14 4th July 2007 03:09 AM
tube driving the same tube - whats the collective word? zobsky Tubes / Valves 3 13th June 2005 06:47 AM

New To Site? Need Help?

All times are GMT. The time now is 05:26 PM.

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