Otl's with AvantGarde Duos?

I am an OTL fan. I settled on the Berning Siegfried amp with my Duos. They sound wonderful together. The Siegfried 811 amp is a SET/OTL, 10 wt/ch. To my mind it combines the intimacy of SET with the speed and transparency of OTL's. Highly recommended.

I love the sound of good OTLs. They have a presence and vitality that makes the music jump. With some horn systems that are a bit forward and emphasize the midrange, this quality may be too much of a good thing. I don't think AGs have that kind of horn sound so I don't see a reason why an OTL wouldn't work. Some OTL's sound a bit light in bass weight, but that is irrelevant with AGs.

The only OTL's I've heard coupled with an AG Duo was the SAP integrated (sounded quite good) and the Tenor (Tenors don't sound like typical OTLs so that doesn't count).

Your combination seems very compelling! Have you tried with other 10-20w combinations as AirTight, Viva Veronas, Art Audio, good Jap's 300Bs and other quality SETs?

Hi Jayarr, FWIW, the Berning is not an OTL. There is a lot of misconception that it is, but it is just that.

An amp that uses an output transformer (air core or not) and semiconductors in the output section does not qualify as an OTL. Unquestionably an innovative design, but it is more accurately described as a Zero Hysteresis Loss amplifier, owing to the fact that there is no hysteresis loss in the output transformer. A true OTL has no output transformer at all and is all tube.

I am afraid that Atmasphere does not quite understand the Berning design, yes, it's not a 40 or 50 year old "OTL" design, but since the transformers and semiconductors are not in the audio frequency signal path, then it's irrelevant if they are there.

This amp is really beyond the normal OTL, which is why Berning named it ZOTL.
The Berning amp is ZOTL and is all tube, completely transformerless and semicondutorless in it's audio signal path.