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6F12

Sensibly equivalent to:
5A/160H 5A/160K 6AM6 8D3 CV138 EF91 HP6 PM07 SP6 Z77
See also:
EF91 - not the valve that won the war - Television RF Valve Development - Valves and their Habits - Valves for Bands III, IV & V - The EF91 and the Blue Band
    
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The 6F12 is the Mazda version of the ubiquitous EF91 of the late 1940s. The 6F12 is a high gain, high impedance, high slope, screened pentode.
The construction matches the Mullard valve with small straps connection the anode plates.
The grids in close-up. The space between cathode and anode is filled with the grids.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 44 mm tall.
References: Datasheet & 1040 Type 6F12 was first introduced in 1948.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a
g3
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
250
-2
10
2.5
1M
7.5
PDF scanned from an original document held by the museum
Updated May 24, 2013.
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