Whest Audio PS.40RDT Phono Preamplifier is a modern-day classic! Continuing in the spirit of the TITAN Pro and a whole new chapter in the Whest Audio phono stage design range, comes the new 40 Series – the 40RDT and 40RDT Special Edition.

The 40 Series adds several layers of extra-dimensional ‘space’ with the greater instrument-harmonic resolution, ‘life-like’ musicality, and a ‘microscopic type’ of focus that the 30 Series electronics was incapable of. The only way Whest found that they could achieve this was to borrow much of the technology and ideas from the TITAN Pro which was designed to be the very best single box phono stage in the world, which it has accomplished, so they felt ‘why not just scale it down’ and use the essential parts to bring the TITAN Pro’s high-resolution sound to a market place that REALLY needs it.

The new 40 Series pushes the boundaries of what is capable at this price level. No other phono stage in the world at this price range has the abilities of the 40 Series thanks to its BIG brother.

The Chassis
Starting with the chassis w430mm x d290mm x h78mm – is manufactured using the same precision computer controlled machining technique, hand-welded and finished seams to give it high rigidity as the TITAN Pro and MC REF V MK4. Internally the chassis incorporates the suspension system used in the MC REF V Mk4. The combination of this suspension system and ultra-strong chassis means that all unwanted vibrations from airborne or structure sources are very well damped.

Ultra Low noise Copper circuitry
The 40 Series circuit board uses ultra-low impurity copper throughout and its copper weight is 4 times that used in nearly all audio electronics. Small signal integrity is of the highest importance and with this in mind a new regulator system has been designed and employed for the 40RDT Special Edition. The new discrete input stage for the 40RDT Special Edition is based ENTIRELY on the MC REF V MK4 input stage but has been ‘trimmed’ for the 40RDT Special Edition. The input stage of the 40RDT uses an ultra low noise/ hand-matched monolithic amplifier. Because all of the major amplifying and filter sections of the 40 Series are channel matched, they are capable of incredible realism.

RIAA Hybrid Active Filtering
The hybrid RIAA filters have been kept in the 40 Series design because not only is it used throughout the full Whest Audio range, but in the 40 Series it is now trimmed to a far tighter tolerance for both curve and channel matching. Channel matching now is to within 0.12dB and RIAA curve accuracy to 0.15dB. Both these figures are across a bandwidth with spans from 9Hz and 62KHz. Any non-Whest Audio phono stage would be at least 4-6dB down at these extremes, but having experience in pro-audio, vinyl cutting and mastering means the folks at Whest Audio know what it takes to get the very best from playing back the vinyl format at al price levels.

Gain and load
The selection is accessed under the chassis like all Whest Audio phono stages. Maximum gain is 72dB and with the internals’ ultra low noise levels it means you will never be stuck for gain ever again! All units are setup for standard low output moving coil (65dB/100ohms with 91pf of input capacitance) but if you do want to experiment it just takes 30secs to change over.
MM gain is at a very healthy and modern 43dB not the older 1970s standard 40dB like our competitors. This with a total capacitance value of 91pf gives a beautifully flat response from your high-performance MM cartridge and an unmatched sublime audio output that can only be achieved from a Whest Audio phono stage.

Signal inputs and outputs
These are on ‘audiophile grade’ RCA and XLR connectors identical to that used in the MC REF V MK4. Because Whest Audio phono stages are used in archiving both professionally and domestically they have included a second set of RCA outputs to allow the user to send the output to their computer for transfer while ‘monitoring’ the output through their main audio system. This also means that the 40 Series can be permanently connected to the computer system and main audio system at ALL times, ready to transfer.

24bit and 32bit digital
The 40 Series noise levels are so low that using 24bit or 32bit conversion is possible without the fear of unwanted signals getting to the sound card. With the PS.40RDT and PS.40RDT Special Edition, we now have a new standard – no other company in the world designs with this much attention to detail for the end-user.

For testing and listening Whest used the following cartridges:

Ortofon MC Anna
Ortofon MC A90/A95
Lyra Atlas
EMT JSD6
Ortofon Cadenza Black
Lyra Kleos
Audio Technica 50ANV
Audio Technica ART 9
Transfiguration Proteus
Dynavector DRTXV-1T
Van Den Hul The Condor

Features of note

40RDT – Reference Dual Transformer with an ultra low noise/ hand-matched monolithic input amplifier.
40RDT Special Edition – As above but with is an ALL discrete transistor design, further channel matching of critical transistor pairs and filter components, higher operating voltage throughout and power transformer matched pairs.
Ultra matching critical components in the audio and DC paths (40RDT Special Edition). The matching is by channel so that each channel behaves EXACTLY LIKE the other. This is translated in far better stable, realistic and etched images with far better musicality.
The internal cabling borrowed from the TITAN Pro is a high-performance Pro-Audio grade OFC type designed for high-frequency stability and phase performance.
High Voltage and elevated voltage rails mean better dynamic range and contrasts.
The new input stage Zero Voltage Float means far better signal transfer tracking and a higher resolution signal into the discrete output stage.

Specs

RIAA curve accuracy: 16Hz - 21.5Khz +/- 0. 15dB or better
Working band: 5Hz - 78Khz +/- 1.0dB
MM Gain: 43dB @ 47K
MC Gain: 50dB - 72dB to suit all 0.15 - 2.5mV cartridges
Loading: 100ohm - 47Kohm in 6 steps
THD+N: 0.002%
Input: Unbalanced RCA
Output: Unbalanced RCA & Balanced XLR
Weight: 14.33 lbs
Dimensions (WxDxH): 18.89” x 11.81” x 3.26”
Finish: Silver or Black