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Old 13th Jul 2018, 8:41 am   #10
cathoderay57
Nonode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 2,354
Default Re: VCM163 Calibration Question

Thanks for all of your replies. The only things I can add are that:
1. I initially used an Iso-tech IDM91 Digital Multimeter on the 200mV AC range to measure the said voltage. As I said in the post, it showed a few millivolts initially (I think around 10) then the voltage decayed to zero.

2. The scope used was a Tektronix T912 that has an input impedance marked as 1M 30pF so looks to be a fairly close match to that of the EA113.

3. I don't have a standardised valve to complete the VCM163 cal proc but used an ECC81 that appears to be new and the test results were as expected so hopefully all is well.

I'll keep a sceptical eye on the test results for valves for a while and if I get any unusual readings I'll try testing a similar valve for comparison before I do any readjustment. Cheers, Jerry
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