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VT-228

Sensibly equivalent to:
8012 CV662
    
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Type VT-228 is the USA service code for the commercial UHF triode Type 8012 and this exhibit carries both names.
Type VT-228 is a VHF/UHF transmitting triode and dates from the early 1940s and has a thoriated tungsten filament as did the earlier 1628. It is designed for forced air cooling.
The control grid can pass up to 14 mA grid current and dissipate 1.6 W. The maximum frequency of operation is in the region of 500 MHz.
Also etched into the glass is the old Uk stores code of 110E/1T1
Slater - the maker's name and their logo.
This valve is unused. The three stranded, twisted and tinned base wires are filament connections including a centre tap connection.
The re-entrant moulding of the glass leading to the base pinch.
The re-entrant top moulding of the envelope showing the evacuation tube on the extreme left.
The thin glass tube envelope is 25 mm in diameter and, excluding the base wires, is 95 mm tall.
References: Datasheet & 3002. Type VT-228 was first introduced in 1941.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
μ
Pout
6.3
1.92
1000
-90
50
18
35W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2016.
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