As part of trying to update the information on Heavy Duty Avometers of
which currently there is very little, I have attached a few more Photos
of what I assume to be the Mk 1 that I posted about previously.
Note the lack of a Dataplate on the back.
A photo of what I assume is a Mk 2 has recently appeared on a different
Thread (Post # 13 ):
https://www.vintage-radio.net/forum/...d.php?t=193847
Does anybody on the Forum know the main differences between all the Marks?
And when they were released?
There were at least 6 Mk's.
From what I gather, the Mk 1 came out in 1948.
The Mk 2, looks like it was in production by around 1952.
The only confirmed Mk 6 had a 1984 Date.
I have no other information on the Heavy Duty, and most of the Survey
records don't have the Mk recorded either.
Service Data is sketchy, although a Schematic for the Mk 5 is in the back
of the Mk 5 user Manual which are fairly common.
I have an undated Schematic found on line which has some Value changes,
but no indication of which Mk it belongs too, so there were clearly changes
going on.
Does anybody have a known Mk 3, or 4?
How can you tell?
Ian