0A2
The 0A2 (European: 150C2) (P/N 154-0001-00) is a 150 V voltage reference tube with a miniature B7G 7-pin base. It is used in the 130.
Note: The designation is 0A2, the leading zero indicating a tube without a heater, although this is often mis-printed as OA2.
Links
Pictures
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0A2 Inside a 130 LC Meter