Winding transformer

I need a transformer for an audio amp, cant find a replacement for less than
$120. Transformer has a couple of windings on the secondary. 32vac each side
of the center tap, 18volts ac for the preamp stage and 6 volts for lights.
I Have a couple of old VARIACs that the mechanical parts are bad/missing. I
was thinking of using one of these as the primary for the transformer and
hand winding the secondary. I am figuring about .6volts a turn. Any reason
why these would not work.

 

What is your tolerance?


I need a transformer for an audio amp, cant find a replacement for less than
$120. Transformer has a couple of windings on the secondary. 32vac each side
of the center tap, 18volts ac for the preamp stage and 6 volts for lights.
I Have a couple of old VARIACs that the mechanical parts are bad/missing. I
was thinking of using one of these as the primary for the transformer and
hand winding the secondary. I am figuring about .6volts a turn. Any reason
why these would not work.

 

I don't think that's a very graceful way to achieve what you want to be
honest.
Why not use a large, more readily available 32-0-32 transformer for the
power amp, and a seperate transformer(s) for the preamp and lights? The
latter transformer(s) shouldn't need to be very big and you should be able
to find space in all but the most packed amps.

Dave.

 

comes down to.. if the jobs worth doing......
$120 isnt a lot, depending on the current draw of the system...

Paul Miller iEng MIIE (elec)

 

Well just went ahead and did it, It seems to work fine. Think I will take
that $120 I saved and take my wife out to dinner.

 

Not to mention finding a torodial core.

I had two identical amps, That how I knew the voltage of the transformer.
Funny thing ,since I changed the transformer the amp sounds better. I cant
quite describe how. Think it may be because I didnt really have the right
wire for the current rating of the amp so I used some 12 guage enameled wire
I had around. This was a lot bigger than what was in the old
transformer.Think I am going to do this to the other amp now.