15D1 @ The Valve Museum

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15D1

Sensibly equivalent^¶ to:

CV2956

See also:

Brimar 15D2 Advert - Brimar 15D1, 9D2, 11D3, 10D1, 4D1, 7D3, 7D6, 7D8, 7A3, R2 & 1D5 Advert

Extras ▼

Brimar Photographic Donations

The 15D1 is a heptode frequency changer for use in both AC and Universal sets. Brimar describe the operation of the valve as being a triode oscillator and a vari-μ tetrode, however, the construction is as a heptode.

The 15A2 differs only in the fact that the heater rating is 4.0 Volts at 0.65 Amp.

Thanks to Mike Edwards for sending these images.

The heptode construction. The oscillator anode can be seen as two plain vertical rods. The anode shape is oval.

The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 97 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 15D1 was first introduced in 1934. See also 1934 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	g2	g1	g3,g5	h	h	k	a	g4

Absolute Maximum Operating Conditions^¶

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	13.0	0.2	250	100	-3.0	3.5	2.7	0.36M	0.55

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated December21, 2020.

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