AVOmeter Model  6
(22 range)

The AVOmeter model 6 was a development of the original AVO multimeter which started life back in 1923. You will find more information here about these instruments and other similar models. AVO also produced a range of smaller multimeters which are described here.

AVO model 6 s/n 6540

This model has a 3 mA movement housed in an aluminium case. The model 6 which was first made in about 1934/5 is quite a rarity as by that time the firm was also producing the more versatile universal AC/DC models.

As can be seen the model 6 which incorporates a divide by 2 button looks much the same as the model2 but has terminals rather than permanently connected leads. The earlier model has a sensitivity of 6mA 

The model 6 with the divide by 2 button shown here looks much the same as the previous model 2 except the horse shoe magnet is aligned at right angles to the panel.

The paint on the scale of this instrument had flaked and curled up completely inhibiting any forward movement of the pointer, my attempts to glue the curled pieces were singularly unsuccessful, resulting in more damage and causing it to come away in flakes. I stuck these back as best I could into position and scanned the result. Then after some editing on the computer printed out a reasonable facsimile as shown here on the right, this was glued on top of what remains of the original scale markings.

This is how the model 6 looked like before it was cleaned up and fitted with new terminals

Batteries A rectangular 1.5 volt cell with a brass terminal and a flying lead for the negative connection. The 1.5 volt battery can be replaced with a single cell size D to with soldered connections.

What is it worth? This one was a gift, but this model is fairly rare so a collector might expect to pay £40 or so. The model 8 being more sensitive is probably a better investment, you should be able to buy a model 8 MkII for£10- 20 which you will find equally as good as the later models.