▼ Menu

A45

 
See also:
Cosmos Advert, October 1927
    
Extras ▼

 

The Cosmos A45 is a bright emitter receiving triode that was introduced by Metro-Vick Supplies, a subsidiary of the Metropolitan Vickers Electrical Co Ltd, in 1925. The first production had a metal base skirt and later types had the bakelite skirt as shown in the picture above. The M over V logo can also be seen as can the filament rating of 4.5 Volts at 0.6 Amps. Both versions employed the same 30  mm wide envelope.
The valve was a general purpose type with an amplification factor (μ) of nine. The control grid voltage range was between 0 and -6 Volts.
The has a closely spaced cylindrical anode and control grid. The filament is a straight tungsten wire that is kept under tension by a wire spring at the top.
See also A45 for our other exibit and close-up images.
The wide glass tube envelope is 30 mm in diameter, and excluding the B4 base pins, is 92 mm tall.
References: 1003 Type A45 was first introduced in 1925.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
ra
gm
4.5
0.6
30-120
-6
20k
0.45
Updated December26, 2011.
Return to Main Index