The 3C24 is a small American transmitting triode. This exhibit also carries the American service code VT-204.

Inspite of its small size it produces a considerable amount of RF power up to the low VHF region.

The anode is a bell that contains the filament and grid in a coaxial arrangement.

The wide glass tube envelope is 33 mm in diameter and, excluding the UX4 base pins, is 90 mm tall.

References: Datasheet. Type 3C24 was first introduced^¶ in 1945.

 
Pin Connections

UX4	1	2	3	4	tc
	f+	-	-	f-	a

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pdiss	Pout	freq	f.max
	6.3	3.0	1000	-70	72	1.3W	25W	47W	60MHz	100MHz

Thanks to Frank Philipse for supplying the above PDF datasheet