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Valve Data: Mullard: ECL86
Released in October 1961, one of the last new general valves, the ECL86 was designed for use in stereophonic amplifiers.  Allowing the signals from crystal and ceramic pick-ups to be amplified to speaker-driving level with the minimum of components.
This Mullard advert from November 1961 announces this valve, alongside the AF118 transistor.  This period is notable as the time of rapid migration from valve to transistor radios.  Valves were beginning to be relegated to high-power and TV use even by 1961.

"The new Mullard triode pentode - the ECL86 - is designed specifically for audio applications and is particularly suitable for stereophonic amplifiers.  The sensitivity of the valve is such that the output derived from low-sensitivity crystal and ceramic pick-ups is adequate to produce a useful output of 3W from the valve in a atypical single-valve circuit and to allow the use of negative feedback.  Special care has been taken in the design of the ECL86 to keep hum modulation to a minimum, and a hum voltage of 4ÁV, referred to the triode grid, is attainable."

Valve Data: ECL86

Triode Output Pentode (pa max = 9W)
(Data taken from Mullard Valve Data sheet)

0.7A, 6.3V Heater
Noval B9A base

Equivalents: 6GW8

Triode Pentode Triode Pentode Triode Pentode
Va 250V 250V Ia 1.2mA 36mA ra 62 kohms 48kohms (anode impedance)
-Vg1 1.9V 7.0V Ig2 --- 6.0mA Ra --- 7kohms (anode load)
Vg2 --- 250V gm 1.6mA/V 10mA/V Pout --- 4.0W