This is a more accurate and virtually identical meter to the earlier model 71. The 1Amp fuse has been omitted and a 2.5 kV socket has been added but otherwise is much the same.
Unfortunately the meter movement was found
to be open circuit but as I also have a model 71
with a good meter but several faulty and or open circuit
resistors I have
exchanged the meter and scaleplates to get a working instrument. This
particular insrument was made for Thorn Television Rentals (TTR)
part of the Thorn Group of companies as was AVO at the time. When Thorn
bought Radio Rentals in 1968,
the two businesses were merged to form Thorn Television Rentals.
The Taylor model 128 is almost identical except it does not have the 2.5Amp or 2500 V ranges
Unfortunately the meter movement of this instrument in my collection is also open circuit
You will find more information
here about these instruments and other similar models. AVO produced a range of
the smaller multimeters such as this which are described
AVO produced the "70 series" range of analogue pocket meters
with 2000 Ohms/Volt sensitivity and 3 inch scale lengths at the
beginning of the 1970's. Taylor Electrical Instruments Ltd of Slough
was taken over by AVO Ltd. in 1958. Soon after in 1959 Metal
Industries Ltd acquired Avo Ltd, including its subsidiary Taylor
Electrical Instruments Ltd and in 1967 Thorn Electrical
Industries took over Metal Industries. It is thought that AVO acquired
Taylor because of their meter movements and that Taylor started
manufactuing at Dover in the 1970s.
The following is from a 1972/3 trade catalogue.
What is it worth? Possibly about £10 perhaps more if case and leads are included
For further information have a look at my pages on similar AVOmeters here