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6F28

Sensibly equivalent to:
EE80
See also:
Mazda TV Frame-Grid Valves Advert
    
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The 6F28 is an amplifier beam tetrode of high mutual conductance designed for television service and introduced by Thorn-AEI (Mazda) in 1961. It is also known as the EE80.
R J Sutherland points out that the tetrode section of the 30FL12 has identical electrical characteristics to the 6F28.
It was designed for use as a video output valve where the high mutual conductance makes it easier to achieve a reasonable stage gain and wide bandwidth.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 52 mm tall.
Reference: 1040. Type 6F28 was first introduced in 1961.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
ic
g1
k
h
h
bp,s
a
g2
-

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
180
180
-2.9
10.0
2.5
0.31M
12.5
Updated February 19, 2014.
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