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6AM6

Sensibly equivalent to:
5A/160H 5A/160K 6F12 8D3 CV138 EF91 HP6 PM07 SP6 Z77
See also:
EF91 - not the valve that won the war - Valves and their Habits - Valves for Bands III, IV & V - The EF91 and the Blue Band
    
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The Mullard EF91 was almost the universal amplifier pentode of the post war era, many manufacturers made versions of this standard valve. Here we have a Mullard made valve but with a Type of 6AM6 - another name for the same design specification.
The 6AM6 is a high gain, high impedance, variable μ, screened pentode. It could be used from AF to VHF up to about 200 MHz and was found in large numbers in most types of electronic equipment. In radio it was used for RF and IF amplification, for oscillators and frequency multipliers.
The anode side view, the strap linking both halves of the anode can be seen on the left.
The white bands at the rear are reflections. The screen and suppressor grids can be seen easily but the control grid just looks like a series of straight lines of a much tighter pitch.
This enhanced image makes the control grid much easier to see.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet, 1043 & 1040 Type 6AM6 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 May 24, 2013.
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