The H210 is a dull emitter triode from Tungsram.

The Top etching gives the details of the valve. The top lettering reads made in Hungary.

The box anode is angled within the balloon envelope. The filament is made of very fine wire and is formed into a single V within the anode. In the full sized picture the filament can be seen and is held in the supports that are folded over to clamp the wire. The blackening of the envelope at either end of the anode suggests an Azide process valve. And the envelope letting confirms it as a barium tube.

The balloon envelope is 47 mm in diameter, and excluding the B4 base pins is 92 mm tall.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	2.0	0.1	150	-1.5	2.0	50,000	0.7	35

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This exhibit was last updated on 05 April 2008