What's your measurement setup, and what capacitance (and resistance) values are you seeing?
If you're seeing significantly higher capacitances, then I wonder about fixturing. Or maybe whoever did the repair wasn't careful about parasitics.
If you're seeing just somewhat higher C and lower R, then perhaps you could try some 1N5711s. These are often double-marked as 5711/6263, but the original 6263 had 10-15% or so higher capacitance, IIRC.
That is a fine instrument, for sure, and I hope you will get it back to like-new performance. It's also fun to use as a front-end for a 1GHz ETS sampling scope.
--Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
toggle quoted message
Show quoted text
On 5/6/2024 9:41 AM, jmr via groups.io wrote:
The main problem is that the input capacitance of the probe is too high and the Rp is lower than it should be up at VHF when compared to a good probe. I think this could be caused by the wrong choice of diodes (1N6263). I won't know for sure until I'm able to take the diodes out of the probes. It's not my VVM yet so I can't do any further internal testing.
