The 4304CB transmitting valve has a directly heated thoriated tungsten filament. The electrodes are sealed into a glass pinch. The B4 base is also seen at the bottom of the picture.

The anode is of carbon and can dissipate 50 Watts. The high operating voltage leads to the placing of the anode connection on the top cap. The grid is moved to a top cap connection in order to allow the valve to operate at high frequency.

The valve is a 1930s design and this exhibit was marked for commercial use. Military versions existed as VT62 and NT58 before the CV designations were introduced in 1941.

The valve was used as a power oscillator as well as a power amplifier.

The balloon envelope is 66 mm in diameter and, excluding the B4 base pins, is 145 mm tall.

 
Pin Connections

B4	1	2	3	4	tc	tc
	-	-	f	f	g1	a

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pdiss	Pout	freq	f.max
	7.5	3.25	1250	-225	90	4.5W	50	75	20	330

This exhibit was last updated on 02 December 2007