Repairing VTL TL2.5 - 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 29th November 2004, 10:47 AM   #1
effindi is offline effindi  Singapore
diyAudio Member
 
Join Date: Aug 2003
Location: Singapore
Default Repairing VTL TL2.5

HI all,

The last time, I posted my problem here, it got me help resolve my problem.

Thistime around , I am facing a problem with the VTL TL2.5 Preamp. The fuse were blown away. Each time, I replace the fuse, it got blown away immediately after switch on. I used the recommended 3A slow blo fuse.

I tried isolating the problem to the trans by desolder all the power connection to the pcb board so that the power trans is not taking in any loading. Again, the fuse did blown away immediately as usual. I was not able to take any measurement at all. There seems to be no short to the ground or whatsoever.

Any guides on what should I do next will be helpful.

Thanks.
__________________
-= It's the inner ear that hears =-
  Reply With Quote
Old 29th November 2004, 09:14 PM   #2
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
look for schematic ,either on net or at VTL ,just to locate exact info about transformer;
then buy new one,and put it in the box
check diode bridges also
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 30th November 2004, 12:09 AM   #3
effindi is offline effindi  Singapore
diyAudio Member
 
Join Date: Aug 2003
Location: Singapore
Thanks for the idea but I would like to confirm that the trans is faulty.

What would be a good way to find out if the trans is causing this problem. It looks like the primary coil is shorting.

There are no trans spec on the VTL website. Anyone have any idea on the trans spec?

Thanks.
__________________
-= It's the inner ear that hears =-
  Reply With Quote
Old 30th November 2004, 03:47 AM   #4
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
It looks like the primary coil is shorting.
With a 3A primary fuse blowing with no load on the secondaries it looks very likely that the primary winding has somehow developped a short.

Quote:
Anyone have any idea on the trans spec?
Not me.
However, if you're lucky you can find a local winder that can repair it for a nominal fee.

Cheers,
__________________
Frank
  Reply With Quote
Old 30th November 2004, 06:57 AM   #5
effindi is offline effindi  Singapore
diyAudio Member
 
Join Date: Aug 2003
Location: Singapore
Thanks.

At least this somehow confirms that the faulty is in the tranformer. I could easily get a transformer to replace this one if only I know the voltage spec.

I have with me a couple of transormer that I can use for this purpose.

Anyone got any idea what would be the likely B+ for a 6350 and 12au7 tube.

Regards,
__________________
-= It's the inner ear that hears =-
  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
Repairing an amp Spax Everything Else 16 5th May 2009 11:48 PM
Repairing MIT ICs question jev Everything Else 3 26th June 2008 07:23 AM
Help repairing a CS-400 glaforce Solid State 2 17th February 2008 08:55 PM
repairing a/d/s/ 640 amp Ocelaris Car Audio 2 16th February 2006 02:35 AM
Repairing an old Mac Amp diyman Solid State 4 5th December 2001 09:37 AM


New To Site? Need Help?

All times are GMT. The time now is 01:15 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