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2C34

Sensibly equivalent to:
4074A CV18 DET19 RK34 VT-224
See also:
National Union 2C34 Box
    
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The 2C34 transmitting double triode covers the VHF frequency range. The triode can be driven hard and this valve can accept a grid current of 15 mA.
This exhibit is unused and the box shows that it was supplied to the US military in 1944 as VT-224, both designations are present on the valve.
The HMS Collingwood Museum also has a 2C34 that is marked with the UK service code of CV18. A push-pull power oscillator was the design purpose for this double triode and thus a transmitter function.
The National Union name is on the composition base.
The Lower mica showing the connections. The single grid lead and its long length will limit the frequency response of this valve but the DET19 datasheet indicates use up to 250 MHz.
The twin sections showing a significant anode box size.
The pinch and lower mica together with the carbonised and ribbed anode. The stitching holding the two anode plates together around the supports can be clearly seen.
The classic envelope is 44 mm in diameter and, excluding the UX7 base pins, is 110 mm tall.
References: Datasheet. Type 2C34 was first introduced in 1938.

 

Pin Connections
UX7
1
2
3
4
5
6
7
tc
tc
h
-
g1(1)
k
g1(2)
-
h
a(1)
a(2)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pdiss
Pout
freq
f.max
6.3
0.8
300
-50
80
2W
5W
15.9W
50MHz
250MHz.
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December26, 2011.
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