Hal -

I finally got a chance to look at that document and I'll admit I'm a little confused. Back in the day, I always used WMT-1 matching transformers to interface a telephone system (600 ohms) with an amplifier - either to a Balanced mic input of (approximately) 150 ohms or to an unbalanced auxiliary input of 15,000 ohms.

Are you saying this is not necessary?!?

I seem to recall being called out to "fix" a problem that was a tape deck (auxiliary output) plugged into a mic input and the sound was horrific (till I "fixed" it by changing the phone plug to an RCA and plugging it into the aux input).

Perhaps with advanced age I'm getting a little slow....

Sam

"Where are we going and why are we in this hand basket?"