Folks, beware that the KT-120 draws 1.8 Amps heater current per tube, as compared to the KT88 1.6A spec. A stereo push-pull amp with four KT-120 tubes will draw 800 additional milliamps from the heater winding. The amplifier's power transformer will run hot and possibly fail in the long run.
I think this may be an excellent tube for a new design buit around its strengths.
IMO one can safely try KT-120s only on conservatively designed tube amps with over-specified power transformers that run cool and that use self-bias / cathode bias.
Fixed bias amplifiers need to be modified before one installs KT-120s, so this rules out most USA-made muscle push-pull amps. I hope this helps.
Help me better understand "self-bias/cathode bias".
My Sonic Frontiers monoblocks use four KT-88s per amp. I have a knob on the amp that allows me to select one of these four tubes. Using a screw driver, I can turn a shaft with a slot in it to adjust the bias using a meter.
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