5840W=EF732 Sylvania NOS 1970”s (5.2ma)

5840W Sylvania NOS 1970”s (W=ruggedized version)

5.2ma

Gm=4400

(5840=subminiature)
(The 5840 is the special quality version of the EF732 pentode. It appears
to be an updated version of the EF72. It is a high impedance device probably
used at as an IF amplifier with a tuned anode circuit at a frequency of 10.7 MHz.
The thin glass tube envelope is 9 mm in diameter, and excluding the B8D base pins is 36 mm tall)

– Soundelux E49
– Soundelux U99
– GROOVE TUBES GT66 mic
– Peluso P-28
– Brauner Valvet-X tube microphone