Wilson Benesch Circle 25 User manual

OWNERS MANUAL
Circle 25 Turntable
A.C.T. 25 Tonearm
Nanotube One Tonearm
THE FUTURE IS CARBON
ANALOGUE COLLECTION

Turntable Hardware Pack
Comprising: 1 x Turntable Drive Belt
1 x 1.5mm Allen Wrench
1 x 2.0mm Allen Wrench
Tonearm Hardware Pack
Comprising: 1 x Counter-Balance Unit*
  1xAn-SkateWeight*
1 x 1.3mm Allen Wrench
1 x 2.0mm Allen Wrench
2 x M3 Cartridge Washers
  2xM3CartridgeScrews
* The Nanotube One’s counter-balance and
an-skateweightcomepre-assembled.Allen
wrenches and cartridge screws are supplied as
detailed above.

Step 1
Carefully remove the turntable from the
packaging,takingcaretoremovetheprotecve
card and dressing which has been placed under
the suspension and around the bearing to
protect the product during transport.
Placetheupperandlowerplinthonaclean,at
surfacethatisfreefromvibraon.
Ideally this would be a pre-leveled audio table
such as the Circle stand that has been designed
forhighlysensivesourceequipment.
Runningyourngersaroundtheoutsideofthe
Circle ensure that the upper and lower plinth
are concentric.
Step 2
Remove the belt from the packaging, being
carefulnottostretchthissensiveelement.
Aachthebeltbyholdingitinthepulleygroove
rst.Thenusingtheotherhand,wrapthebelt
aroundtheoutsideedgeofthesub-plaer.
Itisessenalthatthebeltremainfreefrom
greaseanddirtatallmes.
The smaller groove on the pulley should be
used for 33RPM and the larger groove 45RPM.
Step 3
Gentlyplacetheplaerontopoftheturntable
ensuring that it sits correctly and level on top of
thesub-plaer.
At this stage it can be useful to insert the
supplied power lead and ensure that everything
is running smoothly before installing the
tonearm.

Step 4
Thread the tonearm lead through the hole
in the arm hub. This can only be achieved by
threadingoneplugatame.
Be very careful not to damage the arm hub with
the phono plugs on the end of the lead.
Step 5
Insert the tonearm into the arm hub. Take note
of the groove around the barrel of the stem. For
the correct height, this groove should be just
about visible when viewed from the side, in the
plane of the surface of the arm hub. The arm
clampingscrewcannowbeghtenedusingthe
supplied 2.0mm allen wrench inserted through
the access hole to the rear of the arm hub.
Ifyouarengthetonearmtoanother
turntable then the supplied arm collar will need
tobeedtothearmhuboftheturntable
using the alignment gauge and geometry
supplied with this manual.
Step 6
Carefully remove the cartridge from it’s
packaging.Youarenowreadytoaachittothe
tonearm. Ensure the tonearm is secured using
the clip.
Holdingthecartridgebyitsbody,oerit
up to the four coloured plugs at the end of
thetonearm.Simplysloteachplugtoit’s
corresponding coloured pin. The pins are
usuallyaghtt,sogreatcaremustbetaken
not to damage delicate pins or the wire. A slip
at this stage could easily damage the cartridge.

Step 7
With one M3 cartridge screw, inserted through
one M3 washer in one hand, and the cartridge
in the other. Thread the screw from above
through one of the slots in the end of the
tonearm. The end of this screw should then
be screwed into the corresponding hole in the
upperfaceofthecartridgebody.Youmaynd
iteasiertostartthescrewobyhandand
thennishitowiththesupplied2.0mmallen
wrench.Don’tghtenthescrewtoormlyas
youwillbeadjusngthecartridgeposionlater.
Repeat this process with the other screw.
Step 8
At this stage the bearing can be setup.
Hold the bearing housing with one hand, and
unscrew the grub screw at the side of the
locking collar using the 1.3mm allen wrench.
Lower the locking collar down to the arm
plaormandreghtenthegrubscrewtosecure
it.
Step 9
The next stage is to install the counter-balance
unit.IfyouarenganA.C.T.25tonearm,you
willnoceasmallspring-loadedpininsidethe
mainhole.Inordertoengagethisyoumustlt
thecounter-balancebackalileasyouslideit
onto the balance beam.
Once the pin has passed the end of the beam,
the Counter-Balance should straighten up and
gripthebeamsucientlytobeposioned
whererequired.Byrotangthecounter-
balanceonthebeam,neadjustmentsof
azimuth can be made.

Step 11
The second adjustment related to cartridge
posioninvolvessengthedistancebetween
theneedlepandthetonearmpivot.This
adjustment must be such that as the arm is
moved across the alignment gauge, the needle
ptrackstheprintedarc.Oncethishasbeen
adjusted,itisgoodpraccetore-checkStep10.
Youmaynditnecessarytoalternatebetween
Steps10&11unlyouaresasedwiththe
cartridgeposion,beforenallyghteningthe
cartridge screws.
Donotover-ghtenthescrews,astheallen
wrenchwillexertalotoftorquewithrelave
easesomoderatengerpressureismorethan
adequate.
Step 9 (Nanotube One only)
The Nanotube One counter balance comes with
the beam in place as part of the design and
should be carefully screwed with the lightest
of pressure. The grub screw is located on the
side of the bearing housing that is out of view,
adjacenttothean-skatebeam.
Step 10
With the cartridge alignment gauge/ shim in
posion,youcannowbegintone-tunethe
cartridgeposion.Therstadjustmentshould
bethedirecon.Withtheneedlepplacedat
the cross marked ‘X’, the cartridge body should
run parallel with the grid of lines on the gauge.
The cartridge pins at the rear of the cartridge
areagoodindicatorofdireconandshouldaid
you with this process.
Due to the way that the tonearm wire has been
dressed in the Nanotube One tonearm, it will
requiretheplaertoberemovedbeforethe
next stage can be completed. This allows the
arm park mechanism to be rotated to facilitate
thesengofthecartridgeover-hang.

Step 12
IfyouarenganA.C.T.25orNanotubeOne
thenextstepistothreadthean-skateweight
throughtheholeinthean-skatebeam.
Step 13
Slideonerubber‘O’ringdownthebiasarmand
thenfollowthiswiththean-skateloopand
the second ‘O’ ring to hold this in place.
Step 14
IfyouarenganA.C.T.25tonearm,thean
skate is set as follows:
Each groove groove on the bias arm
corresponds to an increase of 0.5 grams in
cartridgeweight(starngfromthebearing
housing as shown in the diagram below).
Thereforethecorrectposionforthea
cartridge with a weight of 1.8 grams is mid-way
between the third and fourth grooves. The two
rubber ‘O’ rings on the bias arm should grip the
loopedendofthethreadtoholditinposion.
The remainder of the thread should then hang
over the pulley, seated in the groove.

Step 14 (Nanotube One only)
IfyouarengaNanotubeOnethena
rule should be used to set the correct bias.
The measurement should be taken from the
nearside of the bearing housing or “egg” as
shown in the table below.
The thread should be held by the rubber
O-ringstopreventtheposionchanging.
ANTI-SKATEPOSITIONING(NANOTUBEONE)
Distance measured in mm from the side of the
egg shaped bearing housing.
8mm - 1g
11mm - 1.25g
14mm - 1.5g
17mm - 1.75g
20mm - 2g
23mm - 2.25g

GENERAL MAINTENANCE
TheCircle25andtonearmsystemrequiresliletonoadjustmentorrounemaintenanceonceithas
beenassembled.Thesyntheclubricantinthebearingwilllastfortensofyearswithoutanyneedfor
changing. It will not evaporate or degrade like a mineral oil. Moreover the high precision bearing will be
much less likely to be damaged by being taken apart, an undertaking that should be avoided.
Thetonearmbearingrequiresnoserviceandisalifemedesign.Themotorisassembledusingshell
bearingsthatarenotdesignedtowithstandanyon-axisloading.Suchaloadwilldamagethebearings.
Under normal circumstances the motor will last for tens of years. As long as the drive pulleys and belt
arecleanthestabilityandfunconofthesystemwillbecompletelyconsistentyearaeryear.
To clean these items use a cleaning product like pure alcohol. This will remove any grease that may have
builtupfromtheatmosphere.Asobrush,suchasacalligraphybrushcanalsobeusedtocleanthe
Circle 25 and tonearm, taking great care not to scratch any elements.

Wilson Benesch Analogue Product Guarantee
Subjecttothecondionssetforthherein,WilsonBeneschwarrantsitsAnalogueproductstobefreeof
manufacturing defects in material and workmanship for the Warranty Period. The Warranty Period is a
periodof90-daysfromthedateofpurchasebytheoriginalpurchaser,orifthefollowingrequirement
is met, the Warranty Period is a period of two (2) years from the date of purchase by the original
purchaser:
RequirementNo.1.Nolaterthan30-daysaerproductdeliverytothecustomer,thecustomermust
havereturnedtheWarrantyRegistraonFormtoWilsonBenesch;
FAILURETOCOMPLYWITHREQUIREMENTNO.1WILLRESULTINTHEWARRANTYPERIODBEINGLIMITED
TOAPERIODOF90DAYSONLY.
Condions
ThisLimitedWarrantyisalsosubjecttothefollowingcondionsandlimitaons.TheLimitedWarranty
is void and inapplicable if the product has been used or handled other than in accordance with the
instruconsintheWilsonBeneschowner’smanual,orhasbeenabusedormisused,damagedby
accident or neglect or in being transported, or if the product has been tampered with or service or repair
oftheproducthasbeenaemptedorperformedbyanyoneotherthanWilsonBenesch,anauthorised
Wilson Benesch Dealer Technician or a service or repair centre authorised by Wilson Benesch to service
or repair the product.
IninstanceswherereturntoWilsonBenesch’sfactoryisrequired,thedealerorcustomermustrst
obtainareturnauthorisaon.ThepurchasermustpayforshippingtoWilsonBeneschandthereturn
shippingoftheproducttothepurchaser.ARETURNEDPRODUCTMUSTBEACCOMPANIEDBYA
WRITTENDESCRIPTIONOFTHEDEFECT.WilsonBeneschreservestherighttomodifythedesignofany
productwithoutobligaontopurchasersofpreviouslymanufacturedproductsandtochangetheprices
orspecicaonsofanyproductwithoutnoceorobligaontoanyperson.
Remedy
IntheeventthattheproductfailstomeettheaboveLimitedWarrantyandthecondionssetforth
herein have been met, the purchaser’s sole remedy under this Limited Warranty shall be to: (1) contact
an authorised Wilson Benesch Dealer within the Warranty Period for service or repair of the product
withoutchargeforpartsorlabour,whichserviceorrepair,attheDealer’sopon,shalltakeplaceeither
atthelocaonwheretheproductisinstalledorattheDealer’splaceofbusiness;or(2)ifthepurchaser
hassoughtmelyserviceorrepairandtheproductcannotbeservicedorrepairedbytheDealer,
thenpurchasermayobtainareturnauthorisaonfromWilsonBeneschandreturntheproductatthe
purchaser’sexpensereturntheproducttoWilsonBeneschwherethedefectwillberecedwithout
charge for parts or labour.
Warranty Limited to Original Purchaser
ThisLimitedWarrantyisforthesolebenetoftheoriginalpurchaserofthecoveredproductandshall
notbetransferredtoasubsequentpurchaseroftheproduct.