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811


The John Lawrence Collection
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Sensibly equivalent to:- CV628 - VT-217
 
 
 
This exhibit was last updated on 20 April 2013
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Type 811 is an HF/VHF transmitting triode rated for operation up to 60 MHz and therefore at one time widely used in military and professional applications at frequencies which other HF types cannot quite reach.
The 811 was popular valve on the War Surplus market during the late 1940s and early 1950s.
The data given is for Class C operation. The control grid current can be up to 35 mA. The overall rating is high for a valve of this size but, slightly derated, very suitable for amateur use in the higher frequency bands.
The classic envelope is 57 mm in diameter and, excluding the UX4 base pins, is 145 mm tall.
Reference: Datasheet.
 
Pin Connections
UX4
1
2
3
4
tc
f
-
g1
f
a
 
Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pdiss
Pout
μ
6.3
4.0
1500
-113
150
8W
55W
170W
160

Thanks to Frank Philipse for supplying the above PDF datasheet