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M8157

Sensibly equivalent to:
CV483 QV04-7R
See also:
Mullard Special Quality Valves - General Data
    
Extras ▼

 

The M8157 is a special quality version of the commercial QV04-7. The M8157 is a single beam tetrode for transmitter use up to the low VHF region.
The design is all glass as were all of the B9G based valves. The valve would have been used for driver and frequency multiplier stages as well as for low power transmitters. It was designed for class C service.
The makers code is stamped into the aluminium skirt that holds the base plate and spigot on to the glass envelope.
The wide glass tube envelope is 33 mm in diameter and, excluding the B9G base pins, is 57 mm tall.
Reference: Datasheet. Type M8157 was first introduced in 1957.

 

Pin Connections
B9G
1
2
3
4
5
6
7
8
9
h
a
g2
g2
bp,s
k
g1
bp,s
h

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
mAg
Pout
Pdiss
freq
f.max
6.3
0.6
300
250
-50
44
6
0.4
7.7
7.5
60M
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 29, 2013.
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