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The P10 phono amplifier is intended to meet the requirements of audio enthusiasts who still enjoy the distinctive strengths and high quality of reproduction that can be derived from vinyl records. It is compatible with moving magnet and high output moving coil cartridges. Low output moving coil cartridges will require the use of an additional step-up device or matching transformer. Full output from the P10 is sufficient to drive the line level inputs of any integrated amplifier or pre-amplifier.
The active amplification stages use double triodes in a simple anode follower configuration. The phono equalisation is achieved using passive components and can therefore maintain its accuracy over time without introducing the unacceptable levels of phase shift found in active equalisation stages. There is no negative feedback in the circuit.
The P10 features a particularly elaborate HT power supply. After the initial rectification and smoothing, the supply is split and two separate, heavily decoupled high voltage rails are established. These feed each half of the output valve while further decoupling of each rail allows the cleanest and most independent voltage rails possible to feed each half of the input valve. The absolute stability of this supply regardless of the demands made by the audio signal on the circuit, lends the P10 a stability and poise which allows effortless reproduction of the most demanding source material.
The valve filaments are also fed by a DC supply thereby ensuring constant operating conditions for the amplifier.
The circuit makes use of close tolerance metal film resistors, polypropylene signal coupling capacitors and selected valves.
The P10 phono amplifier meets the very strict performance criteria required of all puresound products and will give excellent results with vinyl records provided that it is used with appropriate ancillary equipment.
The T10 mc transformer is now available. It has been our experience that the best results are achieved when using moving coil cartridges loaded via a correctly matched transformer. The T10 contains two wide bandwidth, custom manufactured transformers with MuMetal cores. The transformers have a step up ratio of 1:36 switchable to 1:18 and therefore allow for the adjustment of cartridge loading between 36 and 144 ohms.
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