Re: Repairing my Tektronix 454 oscilloscope need some advice

 

Hi Chuck,

Some HV diodes may need more than 9V to turn on. The ones I used in my HV supply need about 17V for a 2mA forwards current. they are some Chinese 20KV diodes used in microwaves (an overkill but cheap, at $7.49 for 8 of them at Amazon). He can use the +100V of the scope itself through a 100K resistor for a short measurement of 1mA forwards, then reverse the diode and measure zero current.

Ernesto

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