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User Access & Servicing

Phædrus Audio equipment employs thermionic valve (vacuum-tube) technology

and employs hazardous voltages for the high-tension supplies. THE USER SHOULD

NOT ATTEMPT TO SERVICE THE UNIT. ALL SERVICING SHOULD BE REFERRED TO

QUALIFIED SERVICE PERSONNEL OR FACTORY ONLY.

Phædrus Audio products should NEVER be connected to the external power

supply or in any other way energised when the case is opened and/or the circuit

board is accessible.

Ground (earth) issues

Phædrus Audio Ltd.'s products are all powered by external (12V AC) power supplies which should be double

insulated, class-II types (see above). It should therefore be appreciated that,

A CONNECTION TO EITHER THE PHAB, the PHAME, PHILTER of the PHI product CAN NEVER BE

RELIED UPON PROVIDE A PROTECTIVE OR SAFETY EARTH (GROUND). This advice obtains
IRRESPECTIVE OF THE SETTINGS OF ANY "EARTH OR GROUND LIFT" SWITCHES

General Safety Instructions



Do not operate Phædrus Audio equipment near any source of water or in excessively moist

environments.



Keep your Phædrus Audio equipment away from babies, children and pets.



Do not let objects do not fall, or liquids be spilled, into the enclosure.



Situate the Phædrus Audio equipment away from heat sources or other equipment that produce heat.



Ensure Phædrus Audio equipment has adequate ventilation. Improper ventilation will cause overheating,

and can damage the equipment.



When cleaning Phædrus Audio equipment, remove all connections to the unit; including power and

gently wipe with a clean lint-free cloth; if necessary, gently moistened with lukewarm or distilled water.

Use a dry lint-free cloth to remove any remaining moisture. NEVER use aerosol sprays, solvents, or

abrasives on Phædrus Audio equipment.



Phædrus Audio equipment should be serviced by qualified service personnel or returned to Phædrus

Audio Ltd. when: an object (or objects) have fallen into the enclosure; or liquid has fallen into, or been

spilled into the unit; or the unit has been exposed to rain or high humidity; or the unit does not operate

normally or exhibits a marked change in performance; or the unit has been dropped, or the enclosure

has been damaged.

Содержание PHILTER

Страница 2: ...is to reproduce the quality and character of classic equipment but in a modern highly reliable and cost effective way Chapter 1 Background The Phædrus Audio products came about because two recording musicians wanted to own a classic console from the nineteen sixties Ideally a famous EMI REDD all valve vacuum tube mixer used to record The Beatles But those desks make a collection of hen s teeth loo...

Страница 3: ...er designed from the common source of Mullard s reference audio designs and thereby sharing a common heritage with the REDD amplifiers was developed We called this amplifier the Phaedrus PHILHARMONIC literally music loving This PHILHARMONIC amplifier forms the heart of the Phædrus Audio LONDON Mark II console The PHILHARMONIC amplifier circuit is described in detail below in section Circuit descri...

Страница 4: ...ips Although Phædrus Audio equipment uses printed circuit boards to ensure consistent performance and reliability the equipment follows classic practices such as star earths and natural contour tracking just like hook up wire Every Phædrus Audio product is hand assembled and individually tested A test pro forma is provided with every unit Phædrus Audio offer comprehensive service for products both...

Страница 5: ... longer minimum warranty period is mandated by applicable local laws If equipment fails due to such defects within this period Phædrus Audio will at its option repair or provide a replacement for the defective part or product Valves vacuum tubes are excluded from the one year warranty but are warranted for 90 days from day of purchase This warranty does not extend to any Phædrus Audio Ltd product ...

Страница 6: ...red by Phædrus Audio Ltd be sure carefully to read the applicable items of these operating instructions and the safety suggestions Keep them for future reference Follow the warnings indicated on the unit as well as in the operating instructions Selection of PSU Suitable PSUs for the Phædrus Audio Ltd products are available as line items from Phædrus Audio They are PHAE PSU 110 110V mains plugtop P...

Страница 7: ...equipment near any source of water or in excessively moist environments Keep your Phædrus Audio equipment away from babies children and pets Do not let objects do not fall or liquids be spilled into the enclosure Situate the Phædrus Audio equipment away from heat sources or other equipment that produce heat Ensure Phædrus Audio equipment has adequate ventilation Improper ventilation will cause ove...

Страница 8: ...the line amplifier makes up for the loss in the passive Q circuits when the controls are central and no boost is applied In a passive equaliser boost is actually provided by reversing the loss of the equaliser over a range of frequencies In other words when boost is applied bass frequencies are un cut This means that when large degrees of boost are applied it may be necessary to reduce the signal ...

Страница 9: ...o boost in 2dB steps anti clockwise to cut in 2dB steps The central control may be used to modify the character of the treble frequency boost Depending on the frequency setting 2 5kHz 3 5kHz 5kHz 8kHz 10kHz 12kHz when the treble control is rotated clockwise beyond the central position boost is applied with a broad peak in the response at the indicated frequency Note that this control is NOT active...

Страница 10: ...standard VU instrument the input attenuator should be set so that the output level reads around 4VU with occasional peaks to 0VU on programme On a digital meter this is equivalent to signal peaks reading 6dB above recording industry standard 4dBu alignment level This is equivalent to 10dBu or 8dBFS on equipment aligned to EBU R64 1992 standard and 14dBFS on equipment aligned to SMPTE RP155 as illu...

Страница 11: ...g this vintage circuitry to explore its character in gradual overload For example peaks may be allowed to reach 18dB above alignment level without clipping The Phædrus Audio PHAB and the PHAME preamplifiers and the PHILTER equaliser may thus be used directly to feed modern A to D conversion equipment aligned to EBU or SMPTE standards following the recommendations illustrated right Equaliser perfor...

Страница 13: ... Pin 2 Signal Pin 3 Connect to Pin 1 Pin 3 Signal PHILTER Specification Circuit configuration Vintage style inductor capacitor passive EQ Output Balanced Maximum output level 18dBu 1kHz Input Balanced Maximum input level 18dBu 1kHz Gain Nominally 0dB maximum boost is 10dB Frequency response 40Hz to 15kHz 1dB 15Hz to 30kHz 3dB control flat Distortion 1 40Hz 4VU 0dBu gain 40dB Noise 120dB referred t...

Страница 14: ...Box The basis on which conformity is being declared The manufacturer hereby declares that the products identified above comply with the protection requirements of the EMC directive and with the principal elements of the safety objectives of the Low Voltage Equipment directive and that the following standards have been applied IEC INTERNATIONAL STANDARD 60065 Audio video and similar electronic appa...

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