Ypsilon Electronics’ Aelius monoblock

Ypsilon Electronics’ Demetrius Baklavas designed the new $36,000/pair Aelius monoblock amplifier. The Aelius is rated at 220W into 8 ohms, 308W into 4 ohms, and 500W into 2 ohms. It is a hybrid design that features tube inputs, hand-wound interstage coupling transformers, and MOSFET output devices wired in the same type of push-pull Circlotron output configuration that was found in some Output-Transformer-Less tube (OTL) designs. The Circlotron configuration was developed years ago by Electro-Voice, and while the Aelius's output devices are all N-channel MOSFETs, the Circlotron approach is very different from conventional quasi-complementary approaches.

BR78's picture

I think the name of this pushpull is CIRCLOTRON Pat:2705265,

also known as circular pushpull, work only with pentodes and

Mosfets, and it is very stable with Mosfets (don't need any

coupling inductor to the load, at the output).

John Atkinson's picture

Thanks for the info - JA