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TT4

Sensibly equivalent to:
AC/P CV1179 NR57
    
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The TT4 is an indirectly heated audio output triode and was the prototype for the UK Navy NR57. The NR57 was later renamed the CV1179 following the introduction of the CV register in 1941.
The load impedance should be 10,000 Ω and the cathode resistor 800 Ω. The output is of the order of half a Watt.
The reverse is plain except for the code 12P57.
References: Datasheet & 1043. Type TT4 was first introduced in 1937.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f
f
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
1.0
250
-16.0
20.0
3,300
3.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2017.
shape:balloon construction:pinch type:triode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.a pin:2.g1 pin:3.f pin:4.f pin:5.k
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