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BVA172

Sensibly equivalent to:
TP25
See also:
BVA Valves
    
Extras ▼

 

Here we have a UK WWII utility valve. It was made available for civilian radio receivers. Commercially the design was the Mazda TP25 and the 2 in the code identifies this as a Mazda product.
The Mazda TP25 is a triode pentode frequency changer for battery operated broadcast receivers. The special feature of this self oscillating mixer is the low filament consumption.
The reverse is plain zinc paint.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 92 mm tall.
References: Data-sheet, 1040 & 1043. Type BVA172 was first introduced in 1938. See also 1938 adverts.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
f-
nc
a
a(t)
g1(t),g3
m
g2
f+
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.2
120
60
-1.5
0.58
0.92
1.3M
0.26

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
80
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 03, 2022.
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