Sources describe type 6AH6 as a screened pentode whose characteristics and ratings are identical to those of the 6AC7 (and 6AJ7) except for size and that Ra is only 500k rather than 1M. This may be due to the absence of the 6AC7's metal envelope. As in type 6AC7, g3 has its own pin.

We regard the 6AH6 as an all-glass miniature version of the 6AC7 and intended for similar applications. Wideband video amplification being an example. In any compact valve with a substantial heater rating it is necessary to ensure that the grid wires do not become too hot. The use of copper, and particularly the provision of thick copper side-rods helps to conduct heat away from hotspots.

The anode is seen in the picture as a black plate on either side of the central assembly. The two plates are linked by the two black straps. The bright metal structure is the screening plates and the copper grids are clearly visible.

We have seen in some literature that this is a special quality version of the 6AC7.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g1	g3	h	h	a	g2	k

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	mAa	ra	gm
	6.3	0.45	150	12.5	3600	11

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 July 2007 {find valves by name}