I have just purchased the latest Sound Lab M1

You'll have to sort out which side of that understanding you are on then. So- by you: a transformer is not a transformer and semiconductors are not semiconductors.

A transformer is a transformer, a audio output transformer is something else, As I said before Ralph, there are over 2 dozen transformers in these amps and not one even comes close to being a audio output transformer, if you can't understand that, what else can I say man.

Sure is a interesting thread; for me it is pretty simple on the OTL definition; If the input signal flows only off the output tubes and goes to the speaker output jacks then to me the amp is OTL; if there is a transformer in the path it is not OTL.

Hey Allan, let's not be condescending toward one another. I see this thread going nowhere (and far off topic, by the way) due to differences in perception and arguing semantics. A transformer is a transformer; you contend there are none, at least in the audio frequency band. It's not a matter of understanding, it's a matter of definition.

In the end the only thing that counts is the sound. I hope Winston, the originator of this discussion thread, is able to pursue some of the amplifiers suggested and recommend that he contact the respective retailers to audition the candidates in his system to make an informed purchasing decision.

Well my friend Jocelyn, he's the guy that mod's the Acoustat's in Quebec Canada uses a Plinius S-250MK1V on his Acoustat's Spectra 6600, and it's the best sound i have heard in 40 years and i have heard quite a few, i have been attending the Montreal S.S.I. audio show for over 20 years so i know how a good system sounds.

PS: just google MrAcoustat Flickr you will see pictures of my Acoustat's 1+1s and the Acoustat's Spectra 6600s the small one weighs 200 pounds each the big ones 600 pounds all metal frames.