Stay away from these amplifiers if you don’t want to risk serious accidents. It is an outlawed design! Buy yourself a current solid-state amplifier of adequate power for your speakers (no less than 300w.) and you will live happily and carefree, your speakers will be grateful.
Sorry couldn’t help. The risk of frying your ESL is high with them. sold my Atmasphere last year and couldn’t be happier with a pair of class D mono blocks.
I totally agree. For eight months now Mola Mola Kaluga has opened my eyes and ears, and the A1s have thanked me!
Size, weight, power consumption and price that is only a small fraction of that of the usual Class A and AB amplifiers of similar power.
Moreover: performance and sound quality are unquestionably superior.
I am in the process of having my vintage Fourier Sans Pareil OTL’s reconditioned.
The tech is very experienced, an electrical engineer by trade, but needs a copy of the Fourier Sans Pareil OTL manual, including the specific instructions to bias the amps.