Pye Mozart HF10 - Single Ended EL34 Valve Amplifier -1950s

For BBC, Tannoy, Rogers LS3/5A, Lowther Speakers 

Vintage PYE Mozart HF10 - Single Ended EL34 Valve Amplifier   

 Quaity PYE Output & Mains Transformers.

Excellent condition for its age, no modifications.

Brass front & blue chasiss paintwork.

Will require new valves, its fitted with display modern types.

   Service required due to its vintage age.

The Pye Mozart was first seen at the 1957 London Audio Fair. It was, for its day, remarkably small, and was one of the first British amplifiers to utilised the new single-ended Mullard EL34 output pentode which gave considerable peak power and low distortion from a tall and thin glass envelope that saved on chassis space. Another space-saving feature was the use of special highly efficient grain-orientated steel transformers with a claimed efficiency of over 90%.

The amplifier produced 9 watts RMS with a distortion figure of only 0.3% and a printed circuit was used for most of the wiring. The single EL34 output stage received a distributed load via the cathode, which was fed from a winding on the output transformer (which was also as a loudspeaker winding). In this way the voltage on the screen grid of the EL34 was kept rock-steady.

The Mozart also featured a novel feature for the time, dubbed 'Dialomatic' pickup compensation. This consisted of two controls mounted on the back of the chassis, the first being the lower half of a potential divider, its own value being a maximum of 100 K ohms when in the maximum position. The second control made up the upper half of the divider network and also had a maximum value of 100 K. The pickup was wired across both controls in series before being sent to the amplifier. By altering both controls it was possible to compensate for all of the well-known pickups of the day. A table of recommended settings was supplied for most British, Continental and American manufacturers. Another interesting feature was a control for adjusting damping factor, from 15 to infinity.

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