It uses SIT (Static Induction Transistor). SIT characteristics is quite close to vacuum tube Triode. Based on many user's feedback online is that SIT sounds quite close to Triodes!
SIT, THF-51S, 2SK180, 2SK180ES and such are very high power devices with PD of ~400-1KW. Say we take 15% as efficiency of class A amplification, we can easily get 60W - 150W out of SIT! This is definitely more economical and simpler than to draw 50W out of a 212 tube.
A level 1 OPT, tailored for this above application
- Z11 - U$490/pair, Z9 - U$590/pair.
- Pri: 250 Ohm (configurable), inductance ~1H
- Pri DC: 1A (others are available)
- Second: 0-4-8-16R (any)
- Output power: 70W
Some samples bias settings (not tested):
A sample circuit from Nelson Pass, in his SIT Nemesis article:
This looks alike to a normal SPUD circuit and is simple enough for DIYers with experience on building tube amplifiers.
It would be quite interesting and ear opening to try out such designs.
J&K Audio Design
21/6/2018
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