[Princo]

Thanks John,

I put them in my system and run them for a few hours with NFB, they sound fine, very quiet.

When i connect the FB and power up on test with a 10w 10r dummy load, the load resistor gets very hot in a relatively short time (with NFB the dummy load resistor is barley warm), so i am reluctant to leave it switched on, i haven't listened through speakers with FB connected.

When you say swap the leads from the cathodes of v2 do you mean like this(attached)?, is this to do with phasing of the feedback?

Do you think the o/p tx is wound in opposite direction?

Jim