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

VTL Stereo 50
VTL Stereo 50
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 19th March 2013, 05:15 PM   #1
tubenut99 is offline tubenut99  Canada
diyAudio Member
Join Date: Oct 2007
Smile VTL Stereo 50

Any owners out there?
I picked one up one a few weeks back and I'm trying to restore it .
Someone replaced the blown bridge rectifier for the DC heaters off the circuit board and installed a larger rectifier on the back chassis.
All the heaters including the power tubes are now DC.
The only schematic from SDS labs indicates AC heaters for the power tubes.
It makes no sense as the traces are in tact in this amp and it has to be all DC or all AC, as the pin 2 of the 5881 tubes connects to the other pin 2 of the 5881 in that channel then the trace continues to pin 4/5 of the 12at7.
If the pin 2 of the power tubes was to be AC, then the trace would have to be cut and a DC line to the 4/5 of the 12at7.
Anyone have one of these that can open it up and have look? I have one other pix from another fellow and there are white jumpers installed, it's hard to trace from a pix.
  Reply With Quote


VTL Stereo 50Hide 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
Building new GU-50 stereo amp... Wavebourn Tubes / Valves 130 7th December 2014 09:27 PM
VTL Indiansprings Tubes / Valves 10 2nd October 2012 08:22 AM
Heath stereo tube preamp for sale $50.00 ElectricMan Swap Meet 0 15th March 2012 06:04 AM
VTL - Manley stereo 75 Kooka Tubes / Valves 5 22nd May 2008 05:40 PM

New To Site? Need Help?

All times are GMT. The time now is 05:44 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio