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1852

Sensibly equivalent to:
6AC7 CV660 CV1876 VT-112
See also:
Metal Striptease - RCA Television Pentodes 1852 & 1853
    
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The type 1852 / 6AC7 American metal pentode was designed for high gain amplification and when specified by the American government was designated the VT-112 - also printed on the envelope.
Since it has a sharp cut-off it is unsuitable for domestic radios with AGC.
Its intended application is as an IF or video amplifier for wide-band receivers, eg. radars. Bearing in mind that the RCA design of metal valves was pinch-less and had very short lead-outs well shielded from each other by the metal envelope, Type 6AC7 can be thought of as the American answer to the EF50. It consumed 50% more heater power but provided 50% more gm as a result. It was used in enormous numbers in American WWII equipments. Presumably the accessible suppressor grid might be used to 'gate' the signal output if required.
See also 6AJ7 that has identical details.
The VT-112 designation.
The RCA logo.
Factory code.
The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins, is 50 mm tall.
References: Data-sheet & 1040. Type 1852 was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
g3
g1
k
g2
7
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
rk
ra
gm
6.3
0.45
300
150
-2
10
2.5
160
1M
9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 01, 2021.
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