VK Music - Elekit & Triode Japan Forum
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In Reply to: Can KT-120s be used in TU-879S? posted by lektrik on December 3, 2011 at 16:43:37:
The heater on a KT88 is 1.6 Amps - while the heater on a KT120 draws 2.0 amps.
The KT-120 should be directly swappable in many KT-88 amps and run fine but won't sound much different (or worse) from a regular KT-88. To take advantage of the added power, you need to modify the power supply and probably the output transformers. It is too much risk for TU-879S not designed to run on KT-120 tube.
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Topic - Can KT-120s be used in TU-879S? - lektrik 16:43:37 12/03/11 (3)