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Original battery is 22.5V. They are available but expensive. I made a battery pack using two 8 cell battery holders for AA cells and left one cell out putting a wire in place of the battery. probably using all the cells for 24 volts is OK. The thing will run on 18 volts from two 9 volt batteries in series, easier to do but might not last long. It will run on somewhat less than 15 volts, probably the 13.5V mentioned below is the absolute minimum.
?? The story I heard when at -hp- was that the price was about the cheapest -hp- could build any instrument because of the cost of the standard cabinet frames and the cost of doing business, i.e. all the paper work needed to manufacture and sell anything. For some reason I am fond of this instrument despite better meters being available. I think the first thing is to clean the switches carefully and do a complete calibration. Watch out for corroded PCB connectors, lots of push on ones. Most connector problems can be fixed by just exercising them. Maybe cute is a good description. Anyway, I've always been fond of them.

On 4/7/2020 8:56 AM, Martin M wrote:

hello Dave,

yes, specials:
The Power Line Supply is a Option and not always inside.
427A have a Set of 4 obsolete 6.75V mercury batterys,
if they are tired and there is no PSU, build it self.

The instrument needs ±13,5V.
Another way is to use 2 pcs. of 9V Blocks, it will work with them also.

Martin

Am 07.04.2020 um 06:17 schrieb Dave McGuire:

On 4/7/20 12:14 AM, Paul Bicknell wrote:

Just switched on a 427A volt meter that I rescues a few weeks ago

Just wondering is their any think special about it and is it worth spending
any time on as it reads low

?? I've never put my hands on one, but I checked out the specs a bit.? It
doesn't seem particularly noteworthy in any specific way, but it sure
does look like a nice handy all-around bench meter with a nice big meter
face.

????????????? -Dave