215SG @ The Valve Museum

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215SG

Sensibly equivalent^¶ to:

CV1018 CV1048 PM12 S23 S2 SG215 VR18 Z21

See also:

1929 Advert - The SG Valve - CV1018 short entry - Valves for Superhets

Extras ▼

Mazda G8LSD Valve Collection Other 215SG exhibits

The Mazda 215SG is a screen grid valve or tetrode. It was designed for RF amplification in radio receivers. The screen provides isolation between the grid and anode circuits and enables greater individual stage gains to be achieved without instability.

Our other Mazda 215SG is fully metallised.

The other side of the envelope is not silvered and the electrodes are visible. Note the rectangular anode and concentric grids whilst still having the Bakelite top cap assembly of the early 1930s.

The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 110 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 215SG was first introduced in 1929. See also 1929 adverts.

Pin Connections

B4	1	2	3	4	tc
	g2	g1	f	f	a

Absolute Maximum Operating Conditions^¶

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	μ
	2.0	0.15	150	80	-1.5	7.0	-	0.3M	1.1	330

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated June 11, 2022.

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