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Introduction:
Thank you for purchasing a ModWright Instruments product. This unit is designed to offer high
performance and exceptional reliability.
The PH 9.0 phono stage offers high bandwidth, low noise and distortion, and exceptional
musicality. We have designed this phono stage to allow the reproduction of vinyl recordings that
is accurate, transparent and musical.
The PH 9.0 includes features not found in simpler phono stage designs:
Front panel resistance loading on the fly.
0, -6dB and -12dB gain adjustments for MM and MC, on the fly.
MM, Mute, MC input select on the fly.
Mono/Stereo switch on back panel.
The PH 9.0 is a high-gain, low noise phono stage design with exceptional flexibility. Maximum
gain for the PH 9.0 ranges from 64dB (MC) to 52dB (MM). Gain may be adjusted by -0dB,
-6dB or -12dB for either MC or MM operation. This allows for compatibility with different MM
and MC cartridges of high, low or medium gain.
Cartridge loading for MC (resistance only), is user selectable via front panel controls for six
different resistance settings.
Cartridge loading for MM is 47K fixed resistance.
The PH 9.0 was designed purposely with an external, solid-state power supply. The power
supply is connected to the phono stage via a 6ft umbilical, and it is recommended that the power
supply be well separated from the phono stage for lowest possible noise.
The ground lug on the rear of the PH 9.0 enclosure is common to signal ground, earth ground
and the Power Supply and PH 9.0 enclosure. Depending on system grounding, you may need to
connect a ground wire from turntable to the phono stage ground lug.