Sorry that I haven't been following this thread too closely, so I apologize if you've already gone through and checked the various adjustments in the TD circuits. If not, do that first. TDs tend to exhibit long-term drift, which you can compensate to a degree by tweaking the adjustments.
Good luck!
-- Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
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On 3/31/2024 10:11 PM, Adam R. Maxwell via groups.io wrote:
VR322 and VR358 both look OK on the curve tracer, or at least what I think a 4.7 mA TD should look like. I started tracing things out with the side panel off, and things looked reasonable until the Trigger Generator <4> of the manual from tekwiki.
A waveform was present at Q309 and Q317, but not at the base of Q326, so I'll look at that area more closely and take better notes. The triggered holdoff stage description in the manual is over my head, as usual.
thanks,
Adam
