1A7GT @ The Valve Museum

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1A7GT

Sensibly equivalent^¶ to:

CV1802 DK32 VT-147 X14

See also:

Dario 1A7GT Box

Extras ▼

Dario The Radio Museum Other 1A7GT exhibits

The 1A7GT is a heptode frequency changer. The 1A7GT is designed for battery superhet radio receiver use. The local oscillator is formed between the cathode and grid 2. Grid 1 being the oscillator control grid. The pulsating electron flow is screened by Grid 3 from the oscillator and grid 5 from the anode. In this screened space is the mixer control grid g4. For maximum isolation between oscillator and signal circuits the mixer control grid is taken to the top cap.

The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 86 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 1A7GT was first introduced in 1937. See also 1937 adverts.

Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	s	f+	a	g3,g5	g1	g2	f-	nc	g4

Absolute Maximum Operating Conditions^¶

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra
	1.4	0.05	110	60	-0	0.6	0.7	0.6M

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 05, 2022.

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