​RIAA amplifier
Röcklinger PHA2

Balanced RIAA amplifier with an outstanding signal to noise ratio.

Interface

Switchable input impedance: 100, 200, 500, 1k, 47k
Switchable input capacitance: 0, 100pF, 500pF
Switchable amplification: 40dB, 50dB, 60dB, 70dB
Switchable inputs: 5

Connection

Support for moving magnet and moving coil
Inputs: XLR, RCA1 balanced, RCA2 balanced, RCA1 unbalanced, RCA2 unbalanced
Output: XLR balanced & RCA unbalanced

Dimensions

Size 410x280x80 cm
Weight 4,2 kg
Frequency response at 40 dB
Frequency responce at 60 dB

Circuit solution

The chosen circuit is a fully balanced solution with two separate mono amplifiers, thus providing stereo. They are DC coupled with servo adjustment of any offset. Inputs both from RCA and XLR input is feed to the input of the amplifier. A requirement during development was to have all switches controlling the amplifier on the front and not hidden at the back at the bottom. This requirement lead to a design with mos-switches that operate the amplifier and only relays in input and output circuit.

Muting is done during change of settings to avoid any noise from reaching the power amplifier.
The principal schematic shows the symmetrical structure of the amplifier. There are 2 identical amplifiers in each unit. 

Luckily enough this (PHA2) is not only an engineering product, it also sounds really, really good. I would like to state that it is comparable with other RIAA amplifiers 2-3 times the money." 
​
​- Stefan Bystedt (Akkelis Audio)

Behind the specs

Nothing was left unattended. Read up on Röcklingers design decisions.

For the experimental

 Flexible inputs with ability to connect to three record players with balanced and unbalaced RCA.

For the puritan

Clean and true to the RIAA compensation.

For the selective

Switchable impedance, capasitance, amplification and input, all from the front panel.

Read the user manual here

English_PHA2_usermanual.pdf
File Size: 1031 kb
File Type: pdf
Download File
Svenska_PHA2_usermanual.pdf
File Size: 1031 kb
File Type: pdf
Download File

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