Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
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_sock.png ZM1021: Telefunken Taschenbuch 1971
Anonymous 15 Collector

Just Qvigstad
ZM1021: Telefunken Taschenbuch 1971
Anonymous 15 Collector

More ...

Collection of



You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]

Data Compliance More Information