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6AS7GA

Sensibly equivalent to:
6520 6AS7 6N13S A1834 A4475 CV2523 CV2523 ECC230 EI834
See also:
Transformerless Amplifiers
    
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The 6AS7GA is a double triode with a very low AC anode resistance. Electrically the GA variant is identical to the G version. The difference is the tubular envelope with a glass foot base in place of the older pinch construction.
The AC anode resistance is 280 Ohms. The literature gives the original design purpose as a series pass element for stabilised power supplies.
With a pair of U channel anodes for each triode, one per side of the flat cathode, the construction closely mirrors other series pass valves.
The central cathode and grid with anode sections on either side and bridged together at the top.
Looking into the flat based U channel anode. The grid winding extends wider than the anode.
The wide glass tube envelope is 39 mm in diameter and, excluding the IO base pins, is 88 mm tall.
Reference: Datasheet. Type 6AS7GA was first introduced in 1955.

 

Pin Connections
IO
1
2
3
4
5
6
7
g1(2)
a(2)
k(2)
g1(1)
a(1)
k(1)
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
2.5
135
-31.5
125
280
7.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December11, 2019.
shape:wide.glass.tube construction:glass.foot type:double.triode age:1950.1960 base:io heater:6.3v pins:8 pin:1.g1(2) pin:2.a(2) pin:3.k(2) pin:4.g1(1) pin:5.a(1) pin:6.k(1) pin:7.h
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