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845

Sensibly equivalent to:
38145 C845 CV735 VT-43
    
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This is an original 845 of American manufacture. The label on the side is from the BBC valve section and so has some pedigree.
The anode is held by multiple rods welded onto a retaining collar that is clamped to the pinch support tube.
This audio power triode has an anode dissipation of 75 Watts and operates with 1250 Volts on the anode. The thoriated tungsten filament is powered at 10 Volts and 3.25 Amps.
This type of valve is still made in China and provides an excellent way to a single ended class A amplifier.
The wide glass tube envelope is 54mm in diameter, and excluding the special base pins, is 186 mm tall.
References: Datasheet & 4061. Type 845 was first introduced in 1932.

 

Pin Connections
1
2
3
4
g1
f
a
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
μ
10.0
3.25
1,250
-145
90
3.1
5.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 22, 2013.
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