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Section 10: About the Preamp Architecture
Features
The PR-101 preamp has a very flexible design. It features:
Selection amongst six inputs
Support for two tape decks
Buffers for the “to tape” outputs minimizes loading and distortion from
connections to non-powered tape decks
Tone controls with bypass switch
Two separate mute-able outputs to drive two separate power amps
Three slots for future options (e.g. phono preamp, active crossovers, DACs...)
Switched and non-switched convenience outlets
Front panel push button controls with rotary volume, balance, bass and treble
controls.
Remote control of:
o Volume
o Balance
o Tone control bypass
o Mute Amplifier A
o Mute Amplifier B
o Four as yet undefined future functions, F1, F2, F3, and F4
Options for balanced outputs
Feedback volume controls for best signal to noise ratio over the complete range of
settings.
Front panel 1/8” input for Ipod
Microcontroller version is reported by flashes of the F1 LED at power-up. The
form for version 1p2 is (the quick flashes delimit the ends of the slow flash
sequence that specifies the version):
o 2 quick flashes, 1 slow flash, 2 slow flashes, 2 quick flashes
IEC power connector
120 or 240 volt operation (with wiring strapping change)
Specifications
Output impedance (Amp A and Amp B) - 1025 Ohms, DC coupled
Output impedance (To Tape 1 and To Tape 2) - 1000 Ohms, DC coupled
Gain from High Level inputs to Amp A and Amp B outputs - 17 dB (maximum
volume setting)
Gain from High Level inputs to To Tape 1 and To Tape 2 outputs - 0 dB
Input impedance (all high level inputs but Tape 1 and Tape 2) - 50.25 K Ohms
when selected, 100K Ohms when not selected
Input impedance (Tape 1 and Tape 2) - 50.25K always
Fuse rating – 120 Volts – 0.25 Amps, for 240 volt operation-0.125 Amps
Shipping weight – 12 pounds
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