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XFY21

 
See also:
Hivac XFY21 Box
    
Extras ▼

 

The XFY21 is an audio output valve for use in hearing aids. The HT would be 22.5 Volts and the cathode current 0.48 mA. The output delivered to an earphone would be 1.8 mW.
The B5A/F base has pin 1 by the red spot.
The Hivac name on the glass. Within the beam plates are bright and the two wire grids can be seen. The filament is the fine wire in the centre.
A closer view.
The thin glass tube envelope is 6 mm x 9 mm and, excluding the B5A base wires, is 37 mm tall.
Reference: 1040.

 

Pin Connections
B5A
1
2
3
4
5
a
g2
f+
g1
f-,bp

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
1.25
0.0125
22
22
0
0.48
-
Updated December18, 2019.
shape:thin.glass.tube construction:all.glass type:beam.tetrode age:1940.1950 base:b5a pins:5 pin:1.a pin:2.g2 pin:3.f+ pin:4.g1 pin:5.f-.bp
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