This phono preamplifier for Moving Magnet (MM) and Moving Coil (MC) pickup systems is based on the legendary Douglas-Self-Design.
There are two pickup systems for record players:
Moving Magnet (MM) and Moving Coil (MC).
Moving magnet pickups generate a small voltage by moving a magnet between copper coils. MM pickups have a very high inductance and impedance.
The Phonos offers a choice of three capacitors to correct the linearity of the frequency and phase response.
The capacitances are 150pF, 220pF and 330pF.
In the off-position the capacitance is determined by the capacitance of the cable.
The MC pickup is also a small electromagnetic generator, but with the magnets firmly anchored and the coils moving between them, i.e. exactly the opposite of the MM pickup.
The output voltage, however, is very low at only a few hundred microvolts and is therefore more sensitive to noise and induced hum. This makes preamplifier design a challenge, because the very low output voltage must be pre-amplified extremely noise-free. Phonos offers one of the most powerful phono preamplifiers for MC systems with up to 71.5 dB preamplification. Thanks to the 120V technology, the preamplifiers are extremely low-noise, linear and phase-locked.
MC pickups have a very low inductance and impedance.
This means that the effects of cable capacitance (from turntable to preamplifier) are negligible. The impedance, however, is relevant and can be set in six positions: 100, 220, 470, 2.2 k, 4.7 k, and 10 kOhm.
If there is any doubt as to which impedance matches that of the pickup, the impedances can also simply be switched through until the linear frequency response is acoustically determined.
The pre-amplification can be switched in three values. The normal gain value is +46 dB for MM and +67 dB for MC cartridges.
In the -10 dB position, the phono produces enough output level for normal hi-fi equipment operating at a reference level of -10 dBV.
In the +4 dB position, the output level is about as loud as that of modern DA converters at a reference level of 0dBfs = +15 dBu.
The rumbling of the turntable’s drive mechanism is also amplified by the high amplification of the bass range due to RIAA equalization in playback.
The Phonos offers a switchable subsonic filter to remove this rumble.
Gold-plated RCA sockets are available for connecting the turntable and for outputting to a preamplifier such as the Director Mk2 or the Elector.
A ground connection for the turntable is designed as banana plug socket. The ground lead can be either clamped or plugged in.
With all devices of the Professional Fidelity series we develop not only according to plan, but also by ear. Many important components are installed on the circuit boards using THT technology. This way we can ensure that we can use the best sounding components.
RIAA equalization is a specification for the recording and playback of records proposed by the Recording Industry Association of America (RIAA). The RIAA equalization curves introduced a global de facto industry standard for vinyl records in 1954.
RIAA equalization uses pre-emphasis to reduce low frequencies and boost high frequencies when the record is cut (blue RIAA curve).
The bass is reduced by up to 20 dB to provide more space and longer record play time.
The high frequencies are boosted by up to 25 dB to increase the signal-to-noise ratio between the noise of the record media to the audio signal.
During playback, exactly the opposite happens in the Phonos. The de-emphasis filter (red RIAA curve) compensates for the pre-emphasis and the result is a linear frequency response.
The RIAA equalization of the Phonos was developed according to the recommendations of Douglas Self.
Idea: Many small capacities instead of a few large capacities.
Advantages: The capacitors charge and discharge faster, which results in better resolution and faster impulse response.
Only audiophile Styroflex capacitors are used in the entire RIAA equalizer.
About the person: Douglas Self is a British electronics engineer with a strong penchant for audio. He holds honorary degrees from Cambridge University and teaches psychoacoustics at the University of Sussex.
The 120V technology is our reference technology. The 120V technology is unique in the world. It operates at a DC voltage of 120 volts. This is four times that of IC-based semiconductor op-amps. In our Professional Fidelity series, we refer to this unsurpassed technology as VOLTAiR technology.
The 120V technology works with +/-60 V. To be able to handle such a high voltage, we have developed special proprietary operational amplifiers that can operate with a DC voltage of +/-60 V: the SPL 120V SUPRA operational amplifiers.
This high voltage would destroy conventional components and operational amplifiers.
By the way, the “120V” in the name of the technology has nothing to do with the local mains voltage from the mains power socket. This is about the operating voltage inside the device with which the audio signals are processed.
The mains voltage from the mains power socket is transformed to the required secondary voltage in the device’s internal linear power supply with toroidal transformer. Rectifiers convert this AC voltage into DC voltage required in the audio device.
VOLTAiR is a composition of the terms Volt and Air.
Volt is the unit for electrical voltage and Air stands for the unlimited space the music can breathe in.
VOLTAiR symbolizes the perceived limitless dynamics resulting from high audio voltage.
What exactly is that?
And what does it do?
Good questions need good answers.
And that’s what the 120V technology (VOLTAiR) video gives you.
Most audio devices work with an internal operating voltage of +/-15 volts and can thus process a maximum input level of +21.5 dBu. If a DAC, for example, has an output level of +22 dBu at 0 dBFS, level peaks of the music material would already cause overloads in the input stage of the device.
All components in the audio device often operate at their limits. The result is an unsteady sound that causes stress and faster ear fatigue.
SPL devices with VOLTAiR technology can handle input levels of +32.5 dBu thanks to the higher internal operating voltage of +/- 60 volts – thus offering 12dB more headroom. All components consequently operate continuously in the optimum operating range. The result is a very pleasant, natural and relaxed sound experience. So you can enjoy your music in every detail.
These diagrams clearly show the superiority of the VOLTAiR technology in comparison to other circuits with lower, common operating voltages.
In the lab, we pitted Phonitor xe against the best audio measurement system and found that Audio Precision could not measure VOLTAiR technology.
That’s why we manufacture all devices in our own production facility in Niederkrüchten on the Lower Rhine, Germany.
Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.
The product is in stock in our warehouse in Niederkrüchten, Germany, and will be shipped the same or next working day.
We process the orders after receipt of the order and update the stock in the online shop regularly. If the product is no longer available at short notice due to high order volume, you naturally have the right to withdraw from the purchase (see Right of Withdrawal).
In any case, you will receive an e-mail with details of the delivery and the estimated delivery time.
The product is not in stock in our warehouse in Niederkrüchten, Germany. Usually it will be available again within 5 working days.
Due to the current pandemic and the associated worldwide shortage of components, delivery times may be significantly delayed in some cases.
In any case, you will receive an e-mail with the details of the delivery and the estimated delivery time.
Of course you have the right to withdraw from your purchase (see Right of Withdrawal).
Das Produkt ist in unserem Lager Niederkrüchten vorrätig und wird noch am selben oder nächsten Werktag versendet.
Wir arbeiten die Bestellungen nach Bestelleingang ab und aktualisieren den Bestand im Online-Shop regelmäßig. Falls das Produkt wegen hohem Bestellaufkommens kurzfristig nicht mehr verfügbar ist, hast du selbstverständlich das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).
In jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.
Das Produkt ist in unserem Lager Niederkrüchten nicht vorrätig. Gewöhnlich ist es innerhalb von 5 Werktagen wieder verfügbar.
Aufgrund der aktuellen Pandemie und der damit verbundenen weltweiten Bauteileverknappung kann sich die Lieferzeit z.T. stark verzögern.
Auf jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.
Selbstverständlich hast du das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).
Due to Covid19 there are no events scheduled at this time.
Aufgrund von Covid19 sind derzeit keine Events geplant.