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25L6GT

Sensibly equivalent to:
CV553 KT32
    
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The 25L6GT is designed for use in single ended audio stages in apparatus using a 300 mA series heater chain. As a single ended audio amplifier it can produce 4.3 Watts.
This exhibit is British made by Brimar but the etched octagon containing the Type designation looks very much like the RCA style.
The Brimar Name. Through the smokey glass the shape of the anode can just be determined as a rectangular box with side fixing flanges. The box itself is blackened to radiate more efficiently.
The wide glass envelope is 29 mm in diameter and, excluding the IO base pins, is 72 mm tall.
References: Datasheet, 1040 & 1043. Type 25L6GT was first introduced in 1937.

 

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

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
25
0.3
200
110
-8
50
2
30,000
9.5
4.3W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 18, 2017.
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