Repairing VTL TL2.5

[effindi]

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.

 

[Zen Mod]

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

 

[effindi]

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.

 

[fdegrove]

Hi,

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.

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,

 

[effindi]

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,