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Old 16th May 2018, 3:48 pm   #16
Superscope
Octode
 
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
Default Re: AVO Model 9 Mk IV variation

I "bit the bullet" in my Mk IV research and picked up another one to have
a look inside.

This was an 8 Mk IV with the Black Plastic Mk IV style Case. Again, as I have
found previously, the Case is free of any cracking, unlike the common
problem of the Green Case. Serial is printed on the Scaleplate.
I was hoping that it would also have the Repair Unfriendly PCB, so I
could associate the Black Case with the Square Meter Movement Cut Out.

Unfortunately not!
This Jan 1970 Meter has the Standard V Cut Out Mk IV Board.
So there would appear to be no correlation between Case and Board Style!

So I wonder:
What Date did the change to the V Cut Out happen?
(The Square Cut Out seems to be the early Mk IV's). and

What Date did the Green Case replaced the Black Case?
(Assuming that happened in any logical order of course, and did
the Green or Black come first?)

Another thing I noticed, all the Model 8's (Mk IV) I've seen, have the "8 IV"
printed on the Scaleplate, regardless of whether the Serial number is printed there or not.

I have not yet seen a Model 9 Mk IV with a "9 IV" printed on the Scaleplate



Ian
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