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sparkymike · 20th Aug 2014, 12:51 pm

I had a look at the circuit for the 73 but that does not resemble this one.
There are several 1N5400 and 1N5401 diodes numbering around 21 plus around four resistors and two minature diodes. One large 9 turn coil and 1 printed circuit resistor and a long chip which has around six resistances in it.
The face is very similar to the 71/73 type, but does not have the extra socket for amps . I will post some photos later.
Mike.

20th Aug 2014, 12:51 pm	#5
sparkymike Octode Join Date: Dec 2006 Location: Colchester, Essex, UK. Posts: 1,076	Re: PO 12D AVO 81/1 Meter Multirange I had a look at the circuit for the 73 but that does not resemble this one. There are several 1N5400 and 1N5401 diodes numbering around 21 plus around four resistors and two minature diodes. One large 9 turn coil and 1 printed circuit resistor and a long chip which has around six resistances in it. The face is very similar to the 71/73 type, but does not have the extra socket for amps . I will post some photos later. Mike.