Thanks everyone for the replies.

However no one touched the issue whether the proper output transformers have E
and I laminations arranged so as to create a gap (i.e. like non-swinging filter
chokes).

I would not like having to disassemble an audio transformer just for the sake of
determining whether there is a gap in the magnetic path or not.

Buying audio transformers is not cheap today:

- buying in the US implies a minimum shipping charge of about 30$ (international
USPS rates have gone crazy. Forget UPS or Federal Express)

- buying on e-bay not easy either! You'll find yourself within hordes of
esoteric hi-fi aficionados prepared to pay almost any price for plain things. If
you wish to buy a Silver Rock audio transformer (
http://www.mantrasound.it/AC_components/AC2.htm ) be prepared to pay at least
4,200 Euro (about $6,300 with the US$ now getting stronger).

73

Tony I0JX