The 6H6 in the classic glass envelope is physically the largest form of this very useful double diode. Unlike the metal version with the pressed glass foot and miniature construction, this has the old pinch construction and long connecting leads within the envelope. Also it is not screened. The metal 6H6 could work into the VHF region - the glass version could not as the capacitances were too great.

The classic envelope is 36 mm in diameter and excluding IO base pins the valve is 88 mm long.

References: Datasheet, ³⁰⁰² & ¹⁰⁴⁰. Type 6H6G was first introduced^¶ in 1935.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a(2)	k(2)	a(1)	-	h	k

 
Absolute Maximum Operating Conditions^¶

Diode	Vh	Ah	Va	mAa
	6.3	0.3	150	8

Thanks to Frank Philipse for supplying the above PDF datasheet

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