Re: WTB: two OPT's for p-p EL84's

martin griffith wrote:

> On Sun, 29 May 2005 15:47:35 -0400, in sci.electronics.design
> "Engineer" <fakeaddress@xxxxxxxxxxx> wrote:
>
> >I am looking for two new or used high quality OPT's for push-pull
> >EL84's (6BQ5's) for a pair of 10 -15 watt monoblocs I am planning to
> >build (the "Mullard 5-10" circuit.) 8,000 ohms plate to plate, UL
> >type preferred (43% screen taps), but others considered.
> >Please email me at "analogdino 'at' rogers 'dot' com" (formatted
> >correctly.)
> >Ideally, I'd like to find these in the Greater Toronto Area (GTA),
> >Ontario, Canada, to avoid shipping costs, also customs costs if from
> >outside Canada, but this may not work out.
> >Thanks for all replies
> >Cheers,
> >Roger
> >GTA (Toronto), Canada.
>
> try http://www.prodigy-pro.com/
> they do Sowter stuff (excellent), and since they are US based they
> probably arn't too expensive to ship from.
>
> Old Doc Sowter was a cool guy, I'm think he invented Mumetal in the
> days of Flash Gordon, and Tom& Jerry

I'll second Sowter for transformers ( if you really have to use them -
which valves do for output ! ). First class product. Probably the UK
equivalent of Jensen for low level stuff too. I've found their audio
'line level' transformers amongst the very best.

Another couple of names of old - now long gone I think - are Partridge
and Gardner transformers in the UK. I forget wich brand 'Orange' valve
amps used but it was one of them.

Did Jensen ever do OPTs ?

Btw - if you know your stuff you can design your own OPTs. Go for a
toroidal core and you'll get amazing bandwidth compared to EI and better
linearity IIRC.

Graham

.

Relevant Pages

  • Re: THE BILL MAY REPORT: Buying the best output transformer
    ... how "those amateurs designed the glass twice the necessary size". ... He also designs a meaty transformer. ... listening tests, on 13 different transformers, more transformers than ... If, because you're British, you mean Sowter, back when the tests were ...
    (rec.audio.tubes)
  • Re: 12AX7 grid current
    ... You are right - Sowter is generally lax in giving details of its specs - that said they do make ... first class transformers and this one has a primary inductance of 137H which should be more than ... EL84 in triode with an OPT from an old Trio stereo receiver. ... linear as a load of 320ohms or 1k which would be much better. ...
    (rec.audio.tubes)
  • Re: THE BILL MAY REPORT: Buying the best output transformer
    ... the amp ... If, because you're British, you mean Sowter, back when the tests were ... transformers for his hi-fi projects when I was just a slip of a lad. ... Sowter UO70 and the other with a Hammond ...
    (rec.audio.tubes)
  • Re: Homebuilt mic pre
    ... Sowter are quite good but not really in the same league IMHO. ... I see no MICROPHONE transformers on Welter's site. ... the patterns built for Decca, ...
    (rec.audio.tubes)