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6BM8

Sensibly equivalent to:
6F3P 6PL12 ECL82
See also:
The Stereoplex Amplifier
    
Extras ▼

 

The 6BM8 is an audio triode plus output pentode of seven Watt anode dissipation. The output section is a beam tetrode rather than a pentode.
The triode section has a amplification factor of 70, and this valve was much used in record players with crystal pickups. The latter had a relatively high output and when coupled with the single ended pentode output stage made effectively a single valve design. Only a rectifier was required to complete the line-up.
The triode on the right with the screen separating it from the beam tetrode. The cathode is rectangular in cross section.
The stitched anode with the beam plate extending above the top mica.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve is 70 mm long.
References: Data-sheet & 1040. Type 6BM8 was first introduced in 1956.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g1(t)
k,g3,S
g1
h
h
a
g2
k(t)
a(t)

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
gm
6.3
0.78
200
200
-16
35
6.4

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
gm
100
3.5
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 08, 2020.
shape:thin.glass.tube construction:all.glass type:triode.pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g1(t) pin:2.k.g3.s pin:3.g1 pin:4.h pin:5.h pin:6.a pin:7.g2 pin:8.k(t) pin:9.a(t)
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