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TP25

Sensibly equivalent to:
BVA172 CV1345
    
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The Mazda TP25 is a triode pentode frequency changer for battery operated all-wave broadcast receivers. The special feature of this self oscillating mixer is the low filament consumption. The similar TP26 has a lower HT consumption but is designed for long and medium wave battery sets only.
The reverse is plain zinc paint, note the wire round the base shell that connects to the paint. This exhibit looks to be unused and came in the original box.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 88 mm tall.
References: Datasheet, 1040 & 1043. Type TP25 was first introduced in 1938.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
f-
-
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 March 02, 2018.
shape:classic construction:pinch type:triode.pentode age:1930.1940 base:mo heater:2.0v pins:8 pin:1.f- pin:2.- pin:3.a pin:4.a(t) pin:5.g1(t).g3 pin:6.m pin:7.g2 pin:8.f+ pin:tc.g1
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