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ID = 21878
Tube type:  Numerals- and Symbols indicating tube   Indication 
Identical to ZM1021 = Z521M
First Source (s)
Oct.1963 : - - Manufacturers Literature Radiotechnique Memento tubes 10/1963

Base 13 pin or wire all glass N17S-1, B13B
Was used by Technology / Measurement

Formerly Z521M. B13B base.

Information source - - Manufacturers Literature   Telefunken Taschenbuch 1971
- - Manufacturers Literature   Radiotechnique Memento tubes 10/1963
ZM1021: my collection
Giuseppe Antonio Tusini

ZM1021: Telefunken Taschenbuch 1971
Anonymous 15 Collector

ZM1021: Telefunken Taschenbuch 1971
Anonymous 15 Collector

from Just Qvigstad

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