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E1148

Sensibly equivalent to:
CV6 CV1135 CV2920 DET20 VR135 VT-232
    
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The E1148 was the prototype for the CV6. Commercially the CV6 is known as the DET20, the two are similar but not identical. The valve was developed as a VHF oscillator and bringing the control grid to a top cap as well as the anode enabled the frequency of operation to be high.
This American made valve shows that the E1148 was a production valve as well as an experimental prototype. The base valve that was developed into this high frequency valve was the 6J5 triode.
The horizontal electrodes are held in place by four supports fixed into the glass of the pinch.
At this angle the heater can be seen to pass through the cathode as a single strand.
The grid extends slightly either side of the anode.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 72 mm tall.
References: Datasheet & 1005.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
tc
-
h
-
-
-
-
h
k
a
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
Pdiss
Pout
freq
f.max
6.3
0.2
300
25
3.5W
4.25W
50MHz
300MHz
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 17, 2018.
shape:wide.glass.tube construction:pinch type:triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.- pin:2.h pin:3.- pin:4.- pin:5.- pin:6.- pin:7.h pin:8.k pin:tc.a pin:tc.g1
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