Phaedrus Audio PHILTER Bedienungsanleitung

User Manual for

PHILTER – Vintage passive EQ

This manual is also available as a pdf download, Go to: www.phaedrus-audio.com

Preface – About Phædrus Audio

Phædrus Audio was formed to design, manufacture and sell high-quality products for the professional and semi-

professional audio market. Phædrus Audio's founders remain inspired by the music and the recording practices of

the fifties and sixties, and are motivated to re-establish the values of the great audio-technology legends of the

past with their ideals of transparency, hand-built quality, and serviceability. Using modern manufacturing

techniques and the benefits of modern component technology, Phædrus Audio's aim 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 look positively prosaic - as well as

cheap! So, we set about researching with

the idea of producing a replica console.

In order to do this, first it was necessary to

have a design for the amplifier modules

around which the mixers of this vintage

are organised.

In the famous EMI REDD mixers, these

amplifiers were either the German

manufactured V72(S) amplifiers or the,

very rare, EMI built, REDD.47 amplifiers.

V72 and REDD.47 modular amplifiers

Ironically, despite the fact that many more V72 amplifiers exist than do REDD.47s, the EF804 valves which the

German amplifiers use are no longer in current production and are becoming very expensive: whereas the EF86

and ECC88 (E88CC) valves employed in the REDD amplifiers remain in production and are widely available. So, a

new amplifier, 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

descriptions.

Mullard published many reference designs which were used by EMI in developing the REDD amplifiers. At

Phædrus Audio, we went back to these same references to develop our products.

The prototype London Console (Mark II)

Construction - or star earths (grounds) and curly tracks

Given their vintage, the V72 amplifiers and the REDD.47 amplifiers were built on a metal chassis, with the

components hardwired onto tag-strips. 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 inside and outside of their warranty period.

Chapter 2 - Warranty and Service

Please register your purchase with Phaedrus Audio at www.phaedrus-audio/registration.htm . This will simplify

service & repair should you need this service. Your name will be placed on our mailing list (unless otherwise

requested) for future updates and new product announcements.

Service

If you experience a problem with a Phædrus Audio Ltd. product, contact:

support@phaedrus-audio.com

We will diagnose the problem remotely and advise you of the warranty status. If a repair or replacement is

required, we will issue a Return Merchandise Authorization (RMA) number and tell you where to send the unit to

be repaired. You MUST have an RMA number before you return the equipment to Phædrus Audio Ltd.'s support

service. Be sure to write RMA number on outside of shipping box and to include your name, address, phone

number, a copy of original sales invoice and a detailed description of the problem. Phædrus Audio Ltd. will not

accept responsibility for loss or damage in shipping or for equipment returned without valid paperwork and/or a

valid RMA number. Remember, warranty is void if product serial numbers have been removed or altered, or if the

product has been damaged by abuse, accident or unauthorized modification and/or repair (see Phædrus Audio

Ltd. Limited Warranty for details). There are no user serviceable parts inside.

PLEASE RETAIN YOUR SALES RECEIPT. IT IS YOUR PROOF OF PURCHASE COVERING YOUR LIMITED WARRANTY.

LIMITED WARRANTY IS VOID WITHOUT SUCH PROOF OF PURCHASE.

Phædrus Audio Ltd.'s Limited Warranty

This limited warranty is valid only if you purchased the product from Phædrus Audio Ltd. of from a Phædrus Audio authorized dealer in the

country of purchase: a list of authorized dealers can be found on Phædrus Audio website www.phaedrus-audio.com, or by contacting

sales@phaedrus-audio.com. Phædrus Audio Ltd. warrants that the equipment it manufactures shall be free from defects in material and

workmanship for a period of one (1) year from the original date of purchase; unless a 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 that has been damaged or rendered defective as a

result of: accident, misuse, or abuse; or by the use of parts not manufactured or supplied by Phædrus Audio Ltd.; or by unauthorized

modification or attempted repair to the product; or by acts of God/Nature (accident, fire, flood, etc) or any other condition that is beyond the

control of Phædrus Audio Ltd. There are no user serviceable parts inside. This limited warranty is invalid if the factory-applied serial number

has been altered or removed from the product. This limited warranty is extended exclusively to the original buyer (customer of Phædrus

Audio Ltd., or authorized retail dealer) and is not transferable to anyone who may subsequently purchase the product. No other person (retail

dealer, etc.) shall be entitled to give any warranty promise on behalf of Phædrus Audio Ltd. Phædrus Audio Ltd. makes no other warranties,

expressed or implied, of merchantability, fitness for a particular purpose or otherwise. Phædrus Audio Ltd. liability is limited to repair or

replacement by Phædrus Audio Ltd., at its sole discretion and, in no event, will Phædrus Audio Ltd. be liable for any direct, indirect, special,

incremental or consequential damages resulting from any defect in the product, including lost profits, damage to property and, to the extent

permitted by law, damage for personal injury, even if Phædrus Audio Ltd. has been advised of the possibilities of such damages.

Shipping Charges

For any hardware defects experienced by the customer while the product is under warranty, Phædrus Audio Ltd. will incur the shipping cost

to the customer and the customer is responsible for the shipping costs to Phædrus Audio Ltd's designated after-sales service office. For

defective products that are out of warranty the customer is responsible for all shipping costs to and from Phædrus Audio Ltd’s designated

after-sales service office.

Extended warranty and out-of-warranty services

Various services are available from Phædrus Audio Ltd. These include repair services for equipment once the

warranty period has expired, and the ability to extend the warranty period. These are:

PHILTER-REP - Repair of a defective PHILTER equaliser, charged at a flat-rate

PHILTER-MISEAJOUR - Mise à jour for PHILTER*

PHAE-EXTWARR - Extends standard warranty (see above) by a further year**

* A mise à jour service includes a complete inspection, re-valve (re-tube) and the implementation of any

engineering updates as well as a re-test to performance specification.

** If extended warranty is ordered after the initial warranty has expired then the intervening period is charged

without exception.

Please contact your dealer or Phædrus Audio Ltd. for current prices.

Warranty service conditions are subject to change without notice. For the latest warranty terms and conditions and additional information

regarding Phædrus Audio Ltd. limited warranty, please see complete details online at

www.phaedrus-audio.com .

Chapter 3 - Safety

General

Before using any piece of equipment manufactured 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 PSU: plug is North American type.

PHAE-PSU(220Euro) - 220V mains plugtop PSU; plug is European type

PHAE-PSU(220UK) - 220V mains plugtop PSU; plug is 3 pin 13 AMP, British type

A 12V AC supply is required for the Phædrus Audio PHILTER. A direct current (DC) supply is NOT suitable and will

damage the unit. If a supply is sourced elsewhere than from Phædrus Audio, it must have the following

specifications:

12V AC, 12 Watt supply or greater (> or = 1000mA supply current)

Must be suitable for connection to the appropriate mains voltage

Must be Class-II, double-insulated

Must have 30% regulation or better

Must contain one-shot thermal fuses, resettable fuses, or Polyswitches for over-current protection.

UK and Euro units should comply with EN 60950-1 and CE requirements and only PSUs with UL and CSA

approvals should be provided on North American units. Units supplied to other countries should be verified to

comply with the relevant standards which obtain in those territories.

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.

Chapter 4 - Instructions for use

Typical connection set-up for the PHILTER

PHILTER

Application and connections

The PHILTER equaliser is a self-contained, line-level device. The loss due to the passive equaliser circuitry is made-

up in the included, internal line-amplifier. The figure below is a block-diagram, of the unit. The unit is connected

by balanced, earth-free connections on professional XLR connectors. Operating levels are covered below.

One word of warning: remember 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 level

sent to the PHILTER to stop it overloading.

Overload indicator

To prevent inadvertent clipping due to high levels of boost, the PHILTER contains a clip detect circuit which turns

the blue power LED red when the audio level is 3dB below peak. This indicator should only be allowed to flash red

occasionally in operation.

Architecture of the PHILTER equaliser

Controls

Bass, Treble and Frequency-select controls

The equalisation controls on the PHILTER are simple and intuitive to operate. Remember, these circuits were

invented well before the complex, analogue equalisers of the nineteen-seventies. When the middle frequency-

control is turned to the two most anti-clockwise positions, the bass and treble controls (marked with the

appropriate music clefs) act as they do on a hi-fi; as a boost and cut control: clockwise to 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 when treble-frequency cut is applied; this always

remains as a shelving response. The graph below illustrates the 121 separate response curves which result form

the 121 combinations of treble and bass control when the central switch selects the 5kHz, peaking-response.

Note that the cut curves do not exhibit a complementary notch to the boost peak.

Operating levels

Because of the vintage of the PHILTER design, and its

origin in German manufactured broadcast television and

radio equipment, the

envisaged operating

level for this

equipment is slightly

lower than modern

recording industry

standards. When

feeding downstream

equipment, the

output level should

be set to a nominal

0dBu (0.775V RMS).

This means that if monitoring the output on a 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 illustrated). On a broadcast standard PPM, peaks should be set to read 6 on the BBC

scale, or +8 on the European EBU scale. Output level is sufficient easily to modulate semi-pro' equipment (mixers,

DAT, solid-state recorders and many sound cards) to 0dBFS.

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