MULLARD 5-10 AMPLIFIER of 1959

Mullard in their Book ‘Circuits for Audio Amplifiers’ in 1959 included the Mullard 5-10 amplifier; the book cost 8/6d, and it was an immediate success for amateur builders of the time. The amplifier incorporated 5 X valves 2 EL84's in the output stage operating in 'Push Pull' mode an ECC83 as Buffer and phase splitter together with an EF86 first stage and an EZ81 as a full wave rectifier. Producing 10 Watts at less than 0.03% harmonic distortion into a 15 Ohm loudspeaker, this was Monophonic sound, two units would be required for Stereo, but this was still in it's infancy in 1959, and Mono recordings were still being sold at the time. This unit was built around 1964 by the author who had previously made the Mullard 3-3 amplifier, see item A1647. A Pre amplifier was also shown in the same book and included crystal pick up magnetic pick up, and Radio and Microphone inputs, a stereo version was also available, the author used a Decca Deram ceramic cartridge with the mono 2 X valve unit.

A1646