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12М1М_Triode-Pentode12m1m_Triode-Pentode

Information - Help 
ID = 22344
       
Country:
Soviet Union
Brand: Common type USSR (SU) tube/semicond.
Tube type:  Triode-Pentode   Power/Output 
Identical to 12М1М_Triode-Pentode
Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Military and/or Government
Filament Vf 12.5 Volts / If 0.225 Ampere / Indirect / Specified voltage AC/DC
Description

There is another tube 12M1M, a double Pentode.
Or probably this tube is an error in the data books?

 
Information source -- Collector info (Sammler)   Grundig Röhrentaschenbuch, 1948
-- Collector info (Sammler)   Katalog Elektronnyh Lamp. Prag, 1961
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
12m1m_sock.png 12М1М_Triode-Pentode: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector

Just Qvigstad 		12m1m_spec.png
12М1М_Triode-Pentode: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector
 
Forum contributions about this tube
12М1М_Triode-Pentode
Threads: 1 | Posts: 5
Hits: 1158     Replies: 4
Double tetrode
Tomasz Szczesniak
10.Jul.18 		  1
Double tetrode 

This tube looks to be a double tetrode. It has three grids, but the third grid is connected to anode, as red arrow show on photo.

Attachments

Dietmar Rudolph † 6.1.22
10.Jul.18 		  2
Data from Electronic Universal Vade-Mecum 

Your foto indeed shows a tube with a double system of identical systems.

However, the 12M1M is found in the "Electronic Universal Vade-Mecum, Vol 1, Wydawnictwa Naukowo-Techniczne, Warszawa, 1964".

Here, the 12M1M is a Triode - Penthode.

Probably, the type printed on the bulb of your specimen is erranious?

Regards,

Dietmar
Tomasz Szczesniak
10.Jul.18 		  3
Data from Electronic Universal Vade-Mecum 

Yes, I owe this book, and realised that it has some errors and mifinformations, maybe this is one of them. 12М1М is clearly a double pentode, I recently buy this tubes (photos uploaded) and it is easily visible. Photos uploaded by Ernst Erb also depicts double pentode with 3rd grid connected with anode.
Otmar Jung
10.Jul.18 		  4
12M1M double Pentode 

I have moved the pictures to the 12M1M double pentode.

Probably there are two different tubes with the same designation 12M1M or one of them is an error in the data books.
Jacob Roschy
11.Jul.18 		  5
12M1M double Pentode 

These links always calls the 12м1м as double output pentode:

Приемно-усилительные лампы

Лампы и панельки

АудиоПортал
 

the information given in the Electronic Universal Vade-Mecum appears to be wrong.

I don't understand why the third grid is connected to anode. How can this tube operate as output pentode then ?

Best Regards,
Jacob
 
12М1М_Triode-Pentode
End of forum contributions about this tube
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