The AC/TP triode pentode frequency changer is of pinch construction but all internal structures are obscured by the external metalisation. The oscillator triode was designed to produce the 3 volts peak to peak injection required by the pentode section.

See also AC/TP.

The balloon envelope is 43 mm in diameter and, excluding the B9 base pins, is 106 mm tall.

 
Pin Connections

B9	1	2	3	4	5	6	7	8	9	tc
	g2	a	g3	h	h	k	at	gt	m	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	4.0	1.25	250	200	-5	6.5	2.5	0.9M	0.7

Triode	Va	mAa
	150	1.5

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 05 July 2007 {find valves by name}