Red Roo PR5 phono preamp

Australian designed RIAA phono preamplifier equaliser, this is one magnificent phono stage. 

Tube amplification by nature is pure analogue, making it the perfect match for your phono cartridge. And this rig offers 50dB of gain with NO noise. Brilliant!

Support for MM and MC

The Red Roo PR5 offers two Moving Magnet inputs. Unless your rig has two arms with MM cartridges, the PR5's second input is for upgrading to Moving Coil, achieved by the installation of Lundahl LL9226 step up transformers.

Circuit description

The phono input is amplified by two DC coupled twin-triodes configured as Constant-Current-Draw-Amplifiers (CCDA) with cathode-follower output stages. The cathode-follower of the first CCDA drives a passive RIAA equalisation network (so the RIAA characteristics are not significantly affected by tube ageing). The second CCDA stage amplifies the output of the RIAA network to line-level, and its cathode follower output stage is capable of driving low impedance loads or very long/high capacitance cables. There are only two coupling capacitors in the entire signal path (audio grade supplied). The PCB accommodates larger components, if required.

Key features

• Incredibly quiet whilst offering high gain (50dB)
• No solid state devices in the signal path
• Channel selection via front panel
• No mains power enters the equipment
• High frequency DC-DC inverter (50kHz) reduces the size of filtering components resulting in a smaller, lighter circuit
• Differential and common-mode filtering plus electromagnetic shielding ensures pure output
  

Record Restore vinyl cleaner sample included

• 50ml sample (sufficient to clean 5 LPs)
  
• Box Set accessories