77 @ The Valve Museum

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77

Sensibly equivalent^¶ to:

CV616

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Yale Photographic Donations Other 77 exhibits

The type 77 is a general purpose pentode voltage amplifier/detector. As a high impedance device the control grid is taken to the top cap for maximum isolation from the anode circuit.

Thanks to Carl Forsyth for sending the picture.

The classic envelope is 38 mm in diameter, and excluding the UX6 base pins is 100 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 77 was first introduced in 1932. See also 1932 adverts.

Pin Connections

UX6	1	2	3	4	5	6	tc
	h	a	g2	g3	k	h	g1

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	300	100	-3	2.3	0.5	1M	1.25

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated February 20, 2013.

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