"Ronald" wrote

If you test with cheap trannies first , you better know what to
order I
think .....

Ah but Ronald then it will either work OK or not. If not, you will
have no extra clues about why not. Hence no further forward. Cheap
trannies would be useful to establish that the basic idea is
workable, but we know that already.

With simulation you can alter parameters to see what improvements
result, jiggle until you get it right, and then order with
confidence from a winder who knows how to translate from performance
requirements to manufacturing parameters.

With correct analysis you can predict requirements and should not
need to experiment.

Brian Sowter knows his stuff, BTW, and if he is unsure he will say
so.

Just my view.

cheers, Ian


Hi Ian ,

Although I don't have the circuit, I assume bandwidth is
important?
If so, then the capacitance and leakage of the tranny/choke must
be
considered. Maybe leakage isn't crucial...depends.

Might be , but using normal trannies is cheap so testing with it
won't hurt
much ....

Simulation would be dead easy for anyone with a circuit and the
right valve models. Unfortunately no EL86 in my library.

I don't simulate , but maybe PL84 is an option . Only the heaters
are
different .

As Ross says, Sowter could undoubtedly help if they knew what it
is
for. They may well have a stock interstage transformer that
would
do the job, or they can wind an OPT without the secondaries,
presumably. They don't charge extra for one-offs, or for
advice.
They can take a long time to deliver though...

cheers, Ian

Best regards ,

Ronald .