2-2.5W (estimated) - 3K / 4ohm PP OT ...... any idea for a use ?

[kagliostro]

Today I got this small OT (hoping it will be for SE, but getting it anyway because cheap and new)

it is a Stelvio an old italian brand, 3000ohm primary / 4ohm secondary 2-2.5W (estimated power)

if it was for SE I had an use for it, but it is PP ...........

any idea of which can be the right tube for this OT ?

Thanks

Franco

[kagliostro]

Maybe I'm wrong and this is not a push-pull transformer

I came to doubt whether it's an SE transformer with a primary side to feed the G2 (but not UL), I have to do some testing

Franco

[sluckey]

Back in the '60s it was very common for small, cheap single ended OTs to have a tap (not UL) for screens.

[kagliostro]

Ciao Steve

One of the things that suggested me for a PP was the way the laminations are assembled, but looking better to the OT the doubt come to me

and I can say something further only after some test

I've also the doubt that this thing can be planned for a transistor unit output (???)

Franco

[sluckey]

A 3000Ω primary is not likely for a transistor. If I had this many doubts I'd probably put it in the trash.   

[kagliostro]

 

Is a bit of time that I look for a small SE OT with 3 - 3.5K primary, it seems is the good match for a 6AF11 project like the Squirrel Monkey



I've 2 or 3 tubes and a pair of sockets ...........

Sure if it was a PP would not know which tubes can be adopted, but let's wait until we see what it is

Franco

[frankenxtein]

If it's reflective would a 8ohm speaker make it 6k ?  A fiddle tube amp. I was reading smaller OT's have better high frequency response , I was going to tweak one of these little amps here for electric violin.