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TP2620

 
See also:
Mazda Frequency Changer Valves Advert - Valves at Olympia 1934
    
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This triode pentode was designed as a frequency changer for superhet receivers. The pentode has a high anode resistance and low mutual conductance, whilst the triode was designed for use as local oscillator.
This valve is essentially identical to the type AC/TP except for heater rating. A very robust Medium and Long Wave workhorse intended for simpler AC/DC superhets. Not intended for SW use.
The reverse is plain zinc paint.
The metallising seems to have detached around the top leaving the adhesive residue. Inside the wide cathode and wire grids can be seen. the triode would be mounted below the pentode section.
The classic envelope is 45 mm in diameter and, excluding the B9 base pins, is 102 mm tall.
References: Data-sheet & 1043. Type TP2620 was first introduced in 1934. See also 1934 adverts.

 

Pin Connections
B9
1
2
3
4
5
6
7
8
9
tc
g2
a
g3
h
h
k
a(t)
g1(t)
m
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
26.0
0.2
250
200
-5
6.5
2.5
0.9M
0.7

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
150
1.5
PDF scanned from an original document held by the museum
Updated May 09, 2023.
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