42-OT/DD @ The Valve Museum

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42-OT/DD

Sensibly equivalent^¶ to:

CV2512

See also:

Cossor Output Tetrodes Advert

Extras ▼

Cossor Photographic Donation - Mark Mallison

The Cossor 42-OT/DD is a double diode beam tetrode. The output is given as 3.1 Watts with a load impedance of 6,500 Ω and a cathode resistor of 130 Ω.

The B7 Base.

The pinch is visible but the internal coating blocks all other details.

The bottom flap of the box.

Thanks to Mark Mallison for sending the images.

The classic envelope is mm in diameter and, excluding the B7 base pins, is mm tall.

Reference: ¹⁰⁴³. Type 42-OT/DD was first introduced in 1937. See also 1937 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	a(d2)	a	a(d1)	h	h	k	g2	g1

Absolute Maximum Operating Conditions^¶

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	2.0	250	250	-5.5	34.0	7.0	7.0

Updated October 13, 2019.

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