Hi
I'm going to get a load of flak for this
I know a lot of folk are wedded to AVO’s various – I’m not that old so I’m definitely not
My advice is to forget about " retro " meters completely. Get yourself a good second hand scope on e-bay, 50 Mhz is adequate and will probably cost you well under £100 these days. The Philips PM 3215 is an excellent “workhorse” for low frequency work – I have used one for years, they also don’t contain a multitude of “specialist” IC’s the higher performance Tektronix beasts do, so can be mended easily. Also buy a good DMM.
The scope will show you exactly what's imposed on the DC (assuming you are not at the front end of TVs and FM radios) and enable you to do adjustments that involve " peaking " . The DMM will tell you exactly what the voltage is. A bit of circuit analysis will tell you if the voltage read by the DMM is correct without having to allow for any " loading " of the measuring instrument. The DMM will not stop the circuit from functioning correctly as a " obo " meter would if used in a high impedance area
Also, no parallax errors, bent needles, and broken toes (when you drop the ruddy thing on them).
Chris
PS
If you want to economise, forget about the meter, just use the scope