David Berning OTL in the house

[atmasphere]

Every amp Berning has made since 1998 or so has been "OTL", but since it's Berning, that means it operates completely differently than other OTLs. The LTA power amps have 1.7 Ohm output impedances and are happy with 4 Ohm loads or pretty much anything above 1.7. I think that amp switches between feedback and no feedback, and I'm not sure of its specs, but I'm pretty certain it'd also be happy with any standard, low, or high speaker load.

This amp actually looks like it might be an OTL (I'm just basing that on the power tubes I'm seeing in the photos; can't tell what they are but they look like 6AS7Gs; 4 of them would make about 10 watts or slightly more).

FWIW the first sentence in the above quote is false- none of the amp Berning has made during that time were OTLs. OTLs by definition have no output transformer and all of the Berning amps have an output transformer, which disqualifies them for that acronym. Regardless, they are brilliant designs!