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ECC83S

Sensibly equivalent to:
7025 ECC83
    
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The ECC83S is a modern re-working of the classic 1954 double triode design and is essentially a direct equivalent.
The anode is made along high frequency lines in that the central (active) anode region is placed close to the grid with the extra metal further away. The darker area in the image is where the pressing forms the section that is close to the grid. Note also the use of double micas. In the past this technique was employed to reduce the damage caused by vibration.
The robust construction, internal screen and shaped anode is in direct contrast to the original ECC83 shown below.
The original ECC83.
The shaped anode and internal screens.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 51 mm tall.
Reference: Datasheet.

 

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
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-2
1.2
62.5K
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 07, 2017.
shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.hct
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