The VT61 transmitting double triode covers the VHF frequency range. The triode can be driven hard and this valve can accept a grid current of 15 mA. The number of equivalent types attests to its utility.

The classic envelope is 42 mm in diameter and, excluding the UX7 base pins, is 110 mm tall.

References: Datasheet. Type VT61 was first introduced^¶ in 1938.

 
Pin Connections

UX7	1	2	3	4	5	6	7	tc	tc
	h	-	g1(1)	k	g1(2)	-	h	a(1)	a(2)

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pdiss	Pout	freq	f.max
	6.3	0.8	300	-50	80	2W	5W	15.9W	50MHz	250MHz.

Thanks to Frank Philipse for supplying the above PDF datasheet