AVO VALVE DATA MANUALS

The Avo VALVE DATA MANUALS are always in a pretty unhygenic condition. I have seen no others than wrecked up books. On the other hand, this is pretty obvious. Just calculate, if the book was used 40 years each day opended 2 time, it was opended 30.000 times.

I don't know how many editions were printed, but I just start collecting the, here. It seems the color stands for the edition number.

Edition
Year
Color
latest tester mentioned
Copy
1
 
2
 
3
4
5
6
7
1954-1955
Red
Mk3
8
9
1957
Dark Blue

10

11
1958
12
13
14
1960
Dark Green
Mk3
15
16
1964
Light Blue
Mk4
17
1965
Yellow
Mk4
18
19
20
1974
163
21      
22      
23
1981
   

 

It must be said, these manuals are a treasure full of tube data, all tubes with their original operating points. You may just as well use it for any other tube tester, like the AMPLITREX AT1000 which has a very incomplete tube data table by itself.