Transcendant has a SE OTL. I believe it's the only one in production. It's very difficult (prior to the Transcendant, I thought it was impossible) to create usable impedance for speakers in this circuit.
The GM-70 rarely gets used in the US (mostly finds use in ex-Soviet block and in Europe). It is similiar to the 845 so it's a simple revision.
The GM-70 rarely gets used in the US (mostly finds use in ex-Soviet block and in Europe). It is similiar to the 845 so it's a simple revision.