Subminiature Pentode
The 5840W / EF732 Vacuum tube is a special high quality
version of the EF732 or 5840 pentode. They are known for their
low microphonics and extremely low noise. The W version sold here
is a long life military tube and are direct replacements
for EF732 tubes. The W simply means it's a ruggedized version of the 5840
5840W / EF732 tubes are used in TELEFUNKEN
Elektroakustik's current production models of the
AK-47 MkII and ELA M 260 microphones. They are also used in the mxl 2001 mod,
Mojave Audio tube mics, Altec Lansing M-20 and in the R-122V tube ribbon microphone.
They give a Fabulously
balanced and rich tone.
Electrical Data:
Heater Voltage .................... 6.3 V
Heater Current .................... 0.15 A
Preferred Substitutes ............ 5840, 5840W, 5901, 6225, EF732.