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A new output valve has just been released by Marconi and Osram. It is a pentode with characteristics similar to the N41, but it includes two diodes in the assembly for detection and AVC purposes. The valve is known as the DN41, and its heater consumes 2.3 Amperes at 4 Volts, it is rated for anode and screen potentials of 250 Volts and an anode dissipation of 8 Watts. The bias resistance should be 90 Ω and the recommended load impedance is 6,000 Ω, the power output then being 3.7 Watts for 7.5% total second and third harmonic distortion.
The valve is fitted with a B7 base and the grid is brought out to a top cap, with the result that the grid-anode capacity is as low as 0.75 pF. The price is 21s.
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