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N309Sensibly equivalent¶ to:See also:
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The N309 was designed as a sensitive video output valve for television receivers and was released in 1953. It is the equivalent to the Mullard PL83.The N153 is very similar but has a higher ra value.The valve is also rated for service as an audio output device. With 68 Ohms in the cathode lead to generate grid bias, and a load impedance of 5000 Ohms the N309 will give 1.65 Watts at 7.8% total distortion. With the high gm value it will need little drive.
The Marconi label is a brand name of the M-OV company.The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 68 mm tall.References: Data-sheet & 1040. Type N309 was first introduced in 1953. See also 1953 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  g2 | g1 | k | h | h | g3 | a | s | nc |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAs | ra | gm | 
| 15 | 0.3 | 170 | 170 | -2.5,mAa_32.0 | 4.2 | 41000M | 10.0 |
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Updated January 05, 2022.
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