Congrats on the new scope -- I'm sure you'll enjoy it greatly!
As to trace sharpness, the 465/475 series jugs are sort of infamous for not having the smallest spot size. The expansion mesh gets a lot of blame on the web, but that can't be the whole explanation, as there are many crts with expansion meshes that have smaller spot sizes.
Without seeing your scope's trace with my own eyes (photos tend not to have sufficient fidelity to diagnose this at all well), it's hard to say whether what you're seeing is abnormal. But if it's good and bright, it's unlikely to be an EHT problem.
--Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 11/24/2020 16:44, David Collier wrote:
Hi all,
Just acquired a 475A via eBay.
All seems to work except the trigger source switch which may just need adjustment/contact cleaning.
Someone already replaced CR1462 with a larger diode bridge, and the fan motor is noisy.
However, I need replacement knobs for A & B trigger slope (the outer grey ones). Can anyone help with these?
I notice the trace is not as fine as that on my trusty HP1740A: maybe the EHT is too low?
Regards,
David Collier
Canberra
