UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

turretslug · 28th Apr 2016, 6:08 pm

I'm slightly surprised that there's no prominent labelling warning to make the chassis connection first.... Maybe it's from an era when such things were taken as a given.

I wonder what the loading is, I think of 50uA FSD as a "typically" good meter movement, so that would be OK for CTV use but 'scope control divider chains might be problematic. There were electronic Brandenburg 30kV meters around with a 60 Gohm multiplier but I expect these would have been rather more expensive.

The "usual" AVO probe encountered is a GRP tube with multipliers inside, it's probably fine with care but I doubt it'd pass muster as regards modern creepage/clearance expectation.

28th Apr 2016, 6:08 pm	#2
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,400	Re: Rank Bush Murphy EHT meter I'm slightly surprised that there's no prominent labelling warning to make the chassis connection first.... Maybe it's from an era when such things were taken as a given. I wonder what the loading is, I think of 50uA FSD as a "typically" good meter movement, so that would be OK for CTV use but 'scope control divider chains might be problematic. There were electronic Brandenburg 30kV meters around with a 60 Gohm multiplier but I expect these would have been rather more expensive. The "usual" AVO probe encountered is a GRP tube with multipliers inside, it's probably fine with care but I doubt it'd pass muster as regards modern creepage/clearance expectation.