Make no mistake, 431 is a precision voltage reference source integrated circuit, not a triode at all. It can produce an adjustable reference voltage of 2.5~37V. It is produced by A...
What type of triode is printed with TR on the screen on the patch triode?
Make no mistake, 431 is a precision voltage reference source integrated circuit, not a triode at all. It can produce an adjustable reference voltage of 2.5~37V. It is produced by American TI company. The model number is TL431.