speedyj
28-10-2017, 16:15
Great little valve phone stage that I no longer need as selling my turntable. Original valves replaced with JJ Gold Pin valves as advised by Puresound.
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 gain of the P10 is 40 dB (x 100).
Can deliver within 80 miles of Newmarket or can be picked up.
Looking for £250.
http://imagizer.imageshack.us/v2/320x240q90/924/b7t1js.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/8HWLfU.jpghttp://imagizer.imageshack.us/v2/320x240q90/922/iUBKpe.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/3hFvOY.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/wlScN3.jpg
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 gain of the P10 is 40 dB (x 100).
Can deliver within 80 miles of Newmarket or can be picked up.
Looking for £250.
http://imagizer.imageshack.us/v2/320x240q90/924/b7t1js.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/8HWLfU.jpghttp://imagizer.imageshack.us/v2/320x240q90/922/iUBKpe.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/3hFvOY.jpghttp://imagizer.imageshack.us/v2/320x240q90/924/wlScN3.jpg