This exhibit from Philips has a woven mesh anode and an indirectly heated tubular cathode with an oxide coating. The almost square section grid is 2.8 mm across the broad face and the anode is about 6 mm across the face. The construction features a glass tube support mounted horizontally at the top of the anode to give extra rigidity to the electrodes. This stability would help reduce microphony.

The top of the envelope has etched identification lettering. In addition to the makers name and the trade name 'Miniwatt' the country of origin is marked as Made in Holland.

The balloon envelope is 46 mm in diameter, and excluding the B5 base pins is 86 mm tall.

 
Pin Connections

B5	1	2	3	4	5
	a	g1	h	h	k

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	4.0	1.0	200	-8.0	6.0	0.1M	1.4	45

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 16 April 2007 {find valves by name}