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8D3

Sensibly equivalent to:
6064 6AM6 6F12 CV138 EF91 HP6 Z77
See also:
EF91 - not the valve that won the war - Valves and their Habits - Valves for Bands III, IV & V - Brimar 8D3 Advert - Brimar 8D3 Advert - Brimar 6AM6/8D3 Advert - The EF91 and the Blue Band
    
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The 6AM6 and its clones were almost the universal amplifier pentode of the post war era, many manufacturers made versions of this standard valve. The version shown here was made by Brimar.
The construction differs from our other 8D3 and this may be the inclusion of the coating to reduce gas release from the glass. The October 1953 advert refers to an improved reliability design of the 6AM6/8D3 and the reduction of gas emission will increase service life.
The glass coating in areas not covered by the anode.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Datasheet & 1040. Type 8D3 was first introduced in 1947.

 

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
7.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December08, 2015.
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