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7025A

Sensibly equivalent to:
7025 7025WA
    
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The 7025A is a low hum audio amplifier double triode and an improved version of the 7025. It was designed for high gain small signal amplification. The 6.3 Volt heater rating is with the voltage applied between 4 + 5 and pin 9. When used with the connections made to pins 4 and 5 the rating is 12.6 at 0.15 Amp. The electrical characteristics and pin connections almost match the ECC83.
The Clairtone label and twin electrode systems.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 58 mm tall.
Reference: Datasheet. Type 7025A was first introduced in 1959.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a(1)
g1(1)
k(1)
hct

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.3
250
-2
1/2
62,500
1.6
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 28, 2013.
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