23-05-2013, 06:25 PM
Kindly supplied by Yorkie:-
I've scanned five pages of data which explain the numbering systems used for coding valves and transistors - eg what does OA90 or OC44 mean, or EL84 or ECH81 etc.
It was a pull-out supplement in April 1984 Practical Wireless.
Valve & Transistor Codes.pdf (Size: 4.46 MB / Downloads: 20)
I've scanned five pages of data which explain the numbering systems used for coding valves and transistors - eg what does OA90 or OC44 mean, or EL84 or ECH81 etc.
It was a pull-out supplement in April 1984 Practical Wireless.
Valve & Transistor Codes.pdf (Size: 4.46 MB / Downloads: 20)