21-02-2019, 06:23 AM
(20-02-2019, 10:55 PM)Old Sparky Wrote: The readings published in the service data for your R66 were probably taken with an AVO 8 in any case - they may even have used an AVO 7 for this purpose back then.....
Definitely not. Unusually for a set of that period, the voltage readings were taken with an Avo Electronic Testmeter. This has a high input impedance. A modern DMM with 10M input impedance is a sensible alternative. Won't make any difference to the filament voltage measurements as the impedances are low.
A cheap DMM is all you need. Under £10 from many suppliers. For example: https://www.screwfix.com/p/lap-mas830b-d...600v/75337
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
