1 Phono stage highlights
CH products are proudly designed and manufactured in Switzerland by CH Precision Sàrl. Our engineers combined all their know-
how, expertise and ingeniousness to bring you the P1, a top performance future-proof modular two channel phono stage with
Ethernet control capabilities and USB flash-drive firmware update. Like every CH Precision products, the P1 is versatile: two
configurations are possible: Dual Monaural (the P1 holds the Left and Right channels in a single chassis) or True Monaural (two P1s
work together, each one processing a single channel, one phono stage board in each chassis). These configurations can be further
enhanced with the addition of one or two X1 External power supply units.
The P1 is a pure Class A discrete transistor based circuitry. This results is ultra low noise, high bandwidth and high slew rate
performances. The signal stays in the analog domain all the way through.
The P1 provides 3 inputs, two of which are in current mode, dedicated to MC cartridges. The third input is in voltage mode,
accommodating both MM and MC cartridges as well as step-up transformers. The MC1 and MC2 current mode inputs require no
impedance matching. However, the MM/MC voltage mode input is fitted with a variable resistor seen by the connected cartridge as
a load for impedance matching. All the inputs have multiple gain settings.
The P1 holds the standard RIAA playback equalization filter. On top of it, a set of other EQ filters (EMI, Columbia, Teldec and
Decca) is available as an option that can be factory fitted or retrofitted to the unit.
A bypassable subsonic high-pass filter can be inserted in the signal chain to remove unwanted rumble and very low frequency
noises.
The P1 uses tight tolerance, high-grade metal film resistors throughout the audio signal path as well as custom high grade film
capacitors in the filtering sections.
P1 main components
Rev 1.1 P1 User Manual 5
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