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ECC85

Sensibly equivalent to:
6AQ8 6L12 B719
See also:
Valves and their Habits - Television Reception on Band V
    
Extras ▼

 

This exhibit is an ECC85. The maker is the East German RFT group and the logo indicates this. Thanks to Adam Sealey for identifying the logo.
The ECC85 design was specifically aimed at VHF FM receiver front ends.
The twin triode sections with central electrostatic screen.
One anode face view and the number 208045 and code VJ39.
The thin glass tube envelope is 22 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Datasheet & 1040. Type ECC85 was first introduced in 1954.

 

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)
s

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.435
250
-2.3
10
9700
5.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 02, 2018.
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.s
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