[FullRangeMan]

Thanks for the links but unfortunately these are no triode mode curves

Chances are Triode mode was not published by the factory as both are Tetrodes and are used this way in military service. GU72 has a involving sound and have many fans in Soviet area, GMI-11 no so nice.

[E55l2]

Chances are Triode mode was not published by the factory as both are Tetrodes and are used this way in military service. GU72 has a involving sound and have many fans in Soviet area, GMI-11 no so nice.

I am surely interested in the gm72 but i would really like to know who used it in a triode mode in a amplifier

[FullRangeMan]

I am surely interested in the gm72 but i would really like to know who used it in a triode mode in a amplifier

I have seen many builders around this tube.
The socket for this tube is the best military and very cheap.
https://ua.all.biz/en/lamp-gu-72-se-amplifier-g661110

https://www.sibcomplect.ru/shop/evp/generator-lamps/gu/gu-72/

https://www.youtube.com/watch?v=N3lOZb5VjC8

[E55l2]

thanks for the great info and pictures