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VP133

Sensibly equivalent to:
CV1457
See also:
Ediswan Valve Advert
    
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The VP133 is a variable-mu pentode for RF and IF amplification in broadcast superhet receivers. The 200 mA heater requirement and low anode voltage places the design use for this valve as universal mains receivers without a mains transformer. The variable-mu characteristic is designed so that the stage gain can be altered by virtue of altering the bias on the control grid. AGC systems would provide this variable bias according to the strength of the received signal.
The VP133 was introduced in 1938 but appears as current in the post war advert of 1948. British industry took some time to bring out new receiver designs after the end of the war and several set makers offered pre-war designs in the late 1940s. Typical was the 1945 Sobel 615 with a large wooden cabinet and the Bush DAC90 AC/DC set in a Bakelite cabinet. By 1950 radio sets had moved, in general, to being the smaller DAC90A style with miniature valves.
The Sobel 615. Valve line-up: 6K8G, 6K7G, 6K7G, 6Q7G & 5Z4G.
The DAC90A: Valve line-up: UCH42, UF41, UBC41, UL41 & UY41. By contrast the DAC90 valve line-up was: CCH35, EF39, EBC33, CL33 & CY31.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 89 mm tall.
References: Datasheet, 1040 & 1043. Type VP133 was first introduced in 1938.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.0
0.2
150
150
-2.7
8.0
2.2
0.7M
2.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 20, 2017.
shape:classic construction:pinch type:pentode age:1930.1940 base:mo heater:200ma pins:8 pin:1.h pin:2.k pin:3.a pin:4.g2 pin:5.g3 pin:6.m pin:7.- pin:8.h pin:tc.g1
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