In article , Trevor Wilson trevor@SPAMB
LOCKrageaudio.com.au writes

"Wally" wrote in message
...
Trevor Wilson wrote:

**To be honest, I haven't watched a rewinder ply his craft. However,
the usual method is to rotate the former. With a power transformer
(and cheap, crappy valve amp output transformers), it is a two step
operation. 1) Wind primary.
2) Wind secondary.

With a quality, interleaved output transformer, it goes kinda like
this: 1) Wind some primary.
2) Terminate.
3) Wind some secondary.
4) Terminate.
5) - N) Repeat for the required number of interleaves.

So, it's basically the same method as the two-layer version, repeated.
Does
the lay-up of the winding have to be done in some kind of even pattern, or
can it just be wound on to produce layers of even thickness? You said that
the process is difficult to get right - what bits would be difficult to
get
right?

**The process is not so much difficult, as time consuming and hence,
expensive. With valve amplifier output transformers, there is no such thing
as a 'free lunch'. You want a quality amp, you MUST spend the Quid on decent
output transformers.


What's the deal with the grain-oriented plates? What advantage(s) do they
have, and how pricey are they compared to the non-oriented variety?

**Low losses, high permeability, which provide better performance than
regular steel. I don't know about the cost. I would speculate that around
300% higher than the regular stuff.



Two websites of trannie manufacturers that some may find of interest. I
bet there isn't some audio in the world that hasn't been through one of
these companies metal at some time or another!....

Http://www.lundahl.se/


Http://www.sowter.co.uk
--
Tony Sayer