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Pen36C

Sensibly equivalent to:
7D6 C70D CV1672 PP35 Pen3520
    
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The Pen36C audio output pentode is a B7 version of the CL4. The CL4 has a Ct8 base and the valve was also issued with an International Octal base as the CL33. The B7 base was issued in 1933 and this valve was designed in 1935 for use in AC/DC sets wit no mains transformer and a series heater chain.
Mullard tended to add the Suffix -C to a type fitted with a non-standard base cap for sale in a particular market and this may be true here. If so the valve originated with Philips in Europe.
Thanks to Mike Edwards for sending these images.
This exhibit has a slightly rounder envelope compared to Pen36C.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 116 mm tall.
References: Datasheet & 1043. Type Pen36C was first introduced in 1935.

 

Pin Connections
B7
1
2
3
4
5
6
7
-
g1
g2
h
h
k,g3,m
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
33
0.2
200
200
-5.5
45
6
35,000
8.0
4W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 17, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.- pin:2.g1 pin:3.g2 pin:4.h pin:5.h pin:6.k.g3.m pin:7.a
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