Phaedrus Audio PHILTER Manuel utilisateur

User Manual for

PHILTER - passive EQ and tube amplifier

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

Preface – About Phædrus Audio

Phædrus Audio as formed to design, manufacture and sell high-quality products for the

professional and semi-professional audi o market. Phædrus Audio's founders remain inspired by the

music and the recording practices of the fifties and sixties, and are moti vated to re-establish the

values of the great audio-technology legends of the past ith their i deals of transparency, hand-

built quality, and serviceabili ty. Using modern manufacturi ng 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-effecti ve ay.

Chapter 1 - Background

The Phædrus Audi o products came about because t o, recording musicians anted to o n 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 positi vely prosaic -

as ell as cheap! So, e set about

researching ith the idea of

producing a replica console.

In order to do this, fi rst i t as

necessary to have a design for the

amplifi er modules around hich the

mixers of this vintage are organised.

In the famous EMI REDD mi xers,

these amplifiers ere either the

German manufactured V72(S)

amplifi ers or the, very rare, EMI

built, REDD.47 ampli fiers.

V72 and REDD.47 modular amplifiers

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

valves hich the German amplifiers use are no longer in current production and are becomi ng very

expensive: hereas the EF86 and ECC88 (E88CC) valves employed in the REDD ampli fiers remain in

production and are idely available. So, a ne ampli fier, designed from the common source of

Mullard's reference audi o designs, and thereby sharing a common heritage i th the REDD

amplifi ers, as developed. We called this amplifier the Phaedrus "PHILHARMONIC" (li terally

music lovi ng

). This PHILHARMONIC amplifier forms the heart of the Phædrus Audio LONDON

Mark II console. The PHILHARMONIC amplifier circuit is descri bed in detail belo in section

Circuit descripti ons

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 amplifi ers ere built on a metal chassi s,

ith the components hard ired onto tag-strips. Although Phædrus Audio equipment uses printed

circuit boards to ensure consistent performance and r eli abi lity, the equipment follo s "classic"

practices such as star earths and "natural contour" tracking, just like hook-up ire.

Every Phædrus Audio product i s hand assem bled and individually tested. A test pro-forma is

provided ith every unit. Phædrus Audi o offer comprehensive service for products both inside and

outside of their arranty peri od.

Chapter 2 - Warranty and Service

Please register your purchase ith Phaedrus Audi o at .phaedrus-audio/registration.htm . This

ill si mplify service & repair should you need thi s service. Your name ill be placed on our mailing

list (unless other ise requested) for future updates and ne product announcements.

Service

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

support@phaedrus-audio.com

TELEPHONE: +44 207 193 4609

Skype ID: phaedrusaudio

We ill diagnose the problem remotely and advise you of the arranty status. If a repair or

replacement is required, e ill issue a Return Merchandise Authorization (RMA) number and tell

you here to send the unit to be repaired. You MUST have an RMA number before you return the

equipment to Phædrus Audi o Ltd.'s support service. Be sure to ri te RMA number on outside of

shipping box and to include your name, address, phone number, a copy of original sales i nvoice and a

detailed descri ption of the problem. Phædrus Audio Ltd. ill not accept responsibili ty for loss or

damage in shi pping or for equipment returned ithout vali d paper ork and/or a valid RMA number.

Remember, arranty 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 limit ed arranty 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 ebsite

.phaedrus-audio.com, or by contacting sales@phaedrus-audio.com. Phædrus Audio Ltd. arrants that the equipment it

manufactures shall be free from defects in material and orkmanship for a period of one (1) year from the original date of

purchase; unless a longer minimum arranty period is mandated by applicable local la s. If equipment fails due to such

defects ithin this period, Phædrus Audio ill, at its option, repair or provide a replacement for the defective part or

product. Valves (va cuum tub es) are excluded from the one-year arranty, but are arranted for 90 days from day of

purchase. This arranty 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. Ther e are no user s erviceable parts ins ide. This limited

arranty is invalid if the factory-applied s erial number has been a ltered or removed from the product. This limit ed

arranty is extended exclusively to the or iginal buyer (customer of Phædrus Audio Ltd., or authorized retail dealer) and is

not transferable to anyone ho may subsequently purchase the product. No other person (retail dealer, etc.) shall be

entitled to give any arranty promise on b ehalf of Phædrus Audio Ltd. Phædrus Audio Ltd. makes no other arranties,

expressed or implied, of merchantability, fitness for a particular purpose or other ise. Phædrus Audio Ltd. liability is

limited to repair or replacement by Phædrus Audio Ltd., at its sole discretion and, in no event, ill 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 la , damage for personal injury, even if Phædrus

Audio Ltd. has been advised of the possibilities of such damages.

Shipping Charges

For any hard are defects experienced by the customer hile the product is under arranty, Phædrus Audio Ltd. ill 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 arranty 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 arranty period has expired, and the abi lity to extend the arranty peri od.

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 arranty (see above) by a further year**

* A mise à jour service includes a complete inspecti on, re-valve (re-tube) and the implementation

of any engineering updates as ell as a re-test to per formance specification.

If extended arranty is ordered after the initial arranty has expired then the intervening

period is charged ithout exception.

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

Warranty service conditions are subject to change ithout notice. For the lat est arranty terms and conditions and

additional information r egarding Phædrus Audio Ltd. limit ed arranty, please s ee complete details online at

.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 i tems of these operati ng instructions and the safety suggestions. Keep them

for future reference. Follo the arnings indicated on the unit, as ell 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 ill damage the unit. If a supply is sourced else here than from Phædrus Audio, it

must have the follo ing specifications:

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

•Must be suitable for connecti on 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 Polys itches for over-current

protection.

UK and Euro units should comply ith EN 60950-1 and CE requirements and o ly PSUs with UL

a d CSA approvals should be provi ded on North American units. Units suppli ed to other countri es

should be verified to comply ith the relevant standards hich obtain in those terri tories.

User Access & Servicing

Phædrus Audio equipment employs thermionic valve (vacuum-tube)

technology and employs hazardous voltages for the hi gh-tension

suppli es. 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

po er supply or in any other ay energised hen the case i s opened and/or the circuit board is

accessible.

Ground (earth) issues

Phædrus Audio Ltd.'s products are all po ered by external (12V AC) po er suppli es hich 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). Thi s 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 ater or in excessively moist

environments.

•Keep your Phædrus Audio equipment a ay from babies, chi ldren and pets.

•Do not let objects do not fall, or liquids be spilled, i nto the enclosure.

•Situate the Phædrus Audio equipment a ay from heat sources or other equipment that

produce heat.

•Ensure Phædrus Audio equipment has adequate venti lation. Improper ventilati on ill cause

overheating, and can damage the equipment.

•When cleaning Phædrus Audio equipment, remove all connections to the unit; includi ng

po er and gently ipe ith a clean lint-free cloth; if necessary, gently moistened ith

luke arm or distilled ater. 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. hen: 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 - About Valves (Vacuum Tubes)

Valve (tube) types

The Phædrus Audi o PHAB and PHAME preamplifiers and

the PHILTER equaliser employ an EF86 pentode input

valve (tube) and an ECC88, or E88CC, valve (tube) as the

output devi ce. Positi ons for the valves are very clearly

marked on the PCB silkscreen as indicated in the

illustration. The valves (tubes) that are installed in

Phædrus Audio’s products duri ng assembly are selected

to give the best possible per formance. We offer versions of all products ith NOS (rather than

current production) valves. But these must be chosen carefully, and be pr e-screened. Replacing the

suppli ed valves (tubes) ith different, collectible, or “high-end” valves (tubes) types may not

affect any improvement and mi ght cause deterioration of performance.

EF86

The EF86 is a lo noise pentode, ori ginally manufactured by many di fferent factori es and

branded by Phili ps, Mullard, Telefunken, Valvo, and GEC, TESLA and Siemens/RFT. Many

NOS valves are still available. Equivalents include the CV2901 (the UK service desi gnati on

for the EF86) and the CV4085; a special quality versi on for mi litary use. The EF86 tube is

sti ll being produced in Russia and in the Slovak Republi c under JJ Electronics brand name

(formerly Tesla). Chi nese close equivalents are also still being manufactured.

ECC88

The ECC88 is a frame-gri d, sharp cut-off, t in (dual) triode ith an internal,

separating screen. The valve as originally designed for servi ce in the front ends of

VHF radio recei vers. The ECC88 (E88CC) tube type is equivalent to the North

American 6DJ8 tubes and the (rare) military branded CV2492. The transposition of

the fi gures from ECC88 to E88CC as Mullard's ay of denoting a special quali ty

build and is equivalent to the US 6922. Russi an 6N1P tubes and the Chinese 6N1

tube are NOT equivalent. NEVER i stall a 6N1(P) i the Phædrus Audio PHAB,

PHILTER or PHAME product. The ECC88 valve is si ll being manufactured in Chi na

and in the Slovak Republic under JJ Electronics brand name (formerly Tesla).

12AU7 or ECC82

The 12AU7 is a popular, miniature 9-pin medium-gain dual triode valve (tube)

and is used in many instrument and hi-fi amplifiers. Both triodes are used, in

cascade, in the Phædrus Audio PHI product. The 12AU7 is also kno n in

Europe under its Mullard-Phi lips tube designation ECC82. Thi s tube is idely

available both ne and NOS and a number of special quality equivalents are

available. Current producti on of 12AU7 takes place in Russia, Slovakia, and

China. Phædrus Audio selects and recommends the long anode (plate) version of the ECC82

(ECC802S) or 12AU7 valve for application in the PHI DI-Box.

Valve (tube) lifetime

You should replace the valves in the tubes in the Phædrus Audio products only hen you start to

notice changes in the sound quali ty. If the gain of the preamplifier decreases noticeably, then this

is certainly evidence of the onset of valve (vacuum tube) failure. Before this, the tone may become

"dull" and transients may be become "blunted".

That said, the li fetime of a valve (tube) i s largely determined by the lifetime of i ts cathode

emission and the small-si gnal valves (tubes) used in the PHAB, PHAME, PHILTER and PHI use oxide

cathodes, hich can provide adequate cathode emi ssion for 100,000 hours or more. That's over

eleven year’s continuous use. So do not replace valves (tubes) just because they have seen a fe

years service.

Phædrus Audio Ltd. can provide suitabl e valves (tubes) as spares hich, after a burn-in period, are

screened for best performance in your Phædrus Audio product. These are available as line items:

PHAE-12AU7 – Selected 12AU7/ECC82 type valve

PHAE-ECC88 - Selected ECC88 type valve

PHAE-EF86 - Selected EF86 type valve

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

Chapter 5 - Instructions for use

Phædrus Audio’s products employ valves (vacuum tubes) as the ONLY ACTIVE DEVICES in the

audio path. Valves (vacuum tubes) and their associated circuitry need ti me to reach an el ectronic

equilibri um before they ill operate at optimal specifi cations. Please therefore allo these

products to arm up for, at least, 5 to 10 minutes before using them in your signal chain. To

prolong the life of your valves (tubes), it is recommended that you turn off these units hen not in

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 belo is a block-diagram, of

the unit. The unit is connected by balanced, earth-free, transformer-coupled connections on

professional XLR connectors. Operating levels are covered belo .

One ord of arning: remember the line-amplifier makes up for the loss in the passive Q circuits

hen the controls are central (and no boost is applied). In a passi ve equali ser, boost is actually

provided by reversing the loss of the equaliser over a range of fr equencies. In other ords, hen

boost i s applied, bass frequencies are “un-cut”. This means that, hen large degrees of boost are

appli ed, it may be necessary to reduce the signal level sent to the PHILTER to stop it overloading.

Architecture of the PHILTER equaliser

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