It can be lots of things, of course. I am not a fan of the "random potshot" method of repair in general. The wear and tear on a pc board from unnecessary desoldering/soldering adds up. Also, TDs can be more easily damaged by the heat of soldering than are silicon devices. I recommend doing more troubleshooting to rule out other causes before fiddling with the TD.
-- Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 11/16/2021 21:17, quadzillatech@... wrote:
does anyone know if a bad tunell diode can cause this?,i have two spare from a 453a,i see 2 on the b trig board,one near TP675 and onother nearish to what looks like q704,any idea which is which?,ii assume the trig b cct only uses 1 tunell diode?
