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XFR3

Sensibly equivalent to:
CV2239
See also:
Hivac Pressurised Valve Factory - Flat Sub-miniarure Range Advert - Directly Heated Sub-miniature Valves Advert
    
Extras ▼

 

The XFR3 was in live production by Hivac in the mid 1950s. It is a directly heated amplifier triode designed for dry battery operation. Hivac advertise the XFR3 as an RD Oscillator Valve. The Hivac range of miniature wire-ended valves were used in hearing aids in the 1950s and early 1960s. The CV number indicates that these valves were also used in equipment used by the UK government. Portable personal radio communications would be the obvious application.
An alternate view.
The thin glass envelope is 8 x 5 mm in section, and excluding the lead-out wires is 42 mm tall.
Reference: 1040.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
1.25
0.12
135
-5
4.0
-
1.65
Updated November 03, 2016.
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