A 1N4148 will never be able to work at 250MHz.
Rtaher try 1N3595 or equivalent.
substitute and amplitude control was regained and no more flashing
>
> To fix it right, I am looking at a MMBD452LT1G.
Re: Tektronix SG 503 repair
May 24, 2018
1 Replies
**
** Err - that is a very slow, low leakage diode.
... Phil
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