Rb-Pa2 Dual Stereo Riaa Phono Amplifier; Introduction; System Block Diagram; Fig 7-1: Rb-Pa2 Front Panel - Sonifex Redbox Series User Handbook Manual

7 RB-PA2 Dual Stereo RIAA Phono Amplifier

Introduction

Fig 7-1: RB-PA2 Front Panel

The RB-PA2 is a dual stereo RIAA equalised phono amplifier. This record
player preamp amplifies the small signal from your pick up cartridge (either
moving magnet or high output moving coil magnetic) and provides the
necessary RIAA equalisation required for vinyl records, to match it to a
line input of your mixer, or amplifier. It uses a clean RIAA response making
it ideal for use with broadcast turntables and DJ decks and where vinyl
records are being archived to CD for high quality transfers, or for converting
albums to mp3.
It operates with phono cartridges with a nominal output of 1mV to 25mV
and has been specifically tested to work with the Technics SL-1200™ and
1210™ range of turntables. Quality high specification components have
Phono
Left Input
Phono
Right Input
Phono
Fig 7-2: RB-PA2 System Block Diagram For a Single Stereo Channel
RIAA
Gain
RIAA
Gain
Matching Converters - RB-PA2
been used together with low noise, fast acting operational amplifiers to
produce a superbly transparent signal path. Additionally, the RB-PA2 runs
without a rumble filter to produce a powerful bass response.
The RB-PA2 is a dual stereo unit to interface up to two turntables. The
outputs, which may be wired unbalanced if required. Output gain is
individually adjustable for left and right channels in the range 35dB to 65dB
by using pre-set potentiometers. Frequency response is held
within 0.5dB of the RIAA curve and noise is typically better than -84dB RMS
A weighted at 40dB gain.

System Block Diagram

7
Left Output
Professional/Balanced
Right Output
Professional/Balanced
17