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udioØesign
CAD-50M
Midl
OPERATING
MANUAL
NOTE:
Before installing your new CAD-50M Mkll, pleaseread this manualcarefully as it will inform you of the
CAD-50M Mkll specifications,proper installation proceduresandoperationprocedures. Also included in
this manual areguidelines on how to properly service andcarefor your new CAD-50M Mkll.
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Summary of Contents for Cary Audio Design CAD-50M MkII
- Page 1 udioØesign CAD-50M Midl OPERATING MANUAL NOTE: Before installing your new CAD-50M Mkll, pleaseread this manualcarefully as it will inform you of the CAD-50M Mkll specifications,proper installation proceduresandoperationprocedures. Also included in this manual areguidelines on how to properly service andcarefor your new CAD-50M Mkll.
- Page 2 CAD-SOM Midl PUSH-PULL MONO-BLOCS ThenewCAD-50M Mkll mono-blocs are thelead products inanewseries of amplifiers, preamplifiers,phono stage,DA converterandinterconnects. The new 50 seriesis a complete p lugandplayvacuum tube based lineof products w ithease of operation i n mind.The newcircuit t opologies contribute toincredible reliability and enjoyment. CAD-50M Midl For the technically minded, a review of the circuit is in order.
- Page 3 Thepower s upply i ntheCAD-50M Mkll's actually c onsists offourdifferent supplies. Thepowertransformer is designed t o operate ata200%continuous c ommercial service. Thehighvoltage p ower s upply s ection i safullwave center tapconfiguration (notsome cheap v oltage d oubler asused inmany competitors amps) toaPInetwork. T hishigh voltage section feeds thefinaloutput 6 550's.Another supply feeds aPInetwork medium voltage supply for the input anddriver 6SN7tubes.
- Page 4 IC-50-25 & IC-50-3 Weareofferinglonglength interconnects asanincentive to encourage customers to experience mono-blocpreamplifiers.We believethereis someresistance in themarket place to purchase monoamplifiers b ecause of theassumed highcostof quality interconnect Webelieve t hat a home a udio system w ill sound m uch better withlong interconnect feeding t heamplifiers next t otheloudspeakers withveryshort s peaker...
- Page 5 SPECIFICATIONS Operating t heCAD-50M Mkll mono-bloc a mplifier i s asimple procedure, since each unitis designed for longtermstability in virtuallyanyhome operating s ituation. Therefore, if theunitis operated outside theparameters outlined in thisowner's m anual, damage mayresult. P lease read thismanual carefully b efore p utting yournewCary Audio DesignCAD-50M Mkll in operation.
- Page 6 FREQUENCY RESPONSE ( atone wattoutput):15Hzto 23,OOOHz+O-O.75dB TUBES:2-6SN7 inputtube, 2 -6550 output t ubes TRANSFORMERS: 1-EI laminated c ore power t ransformer 1-Specialair gapoutput transformer 200% duty cycle on all transformers RESISTORS: metal film CAPACITORS Polystyrene and polypropylene (oilfilledoptional) POWER SUPPLY C APACITORS: 2- 1200 MFD@450volts AC CORD: 3 conductor detachable AC POWER REQUIREMENTS: 117 volts AC 50/60Hz...
- Page 7 BIAS JACK: 1/4"jack for provided1/4"plug to measure thebias. BIAS POTENTIOMETER:Screwdriver a djustment. S ee biasinstructions a t theendof this manual. CAUTION EQUIPMENT DAMAGE MAY OCCUR WITH IMPROPER FUSES AC FUSE: AC power fuse.Neverreplace withanyfusethan2 AMP SLOWBLOW! 250VOLT! (IA slowblow for 220Vto 240V) CAUTION NEVER REMOVE / INSERT AC LINE CORD WHEN THE UNIT IS ON INSTALLATION...
- Page 8 Fill out theenclosed warrantyregistration cardandreturnit to CaryAudioDesign, I nc. within 10 daysof original purchase.Keepyour original salesslip with the packing cartonsshouldyou everneedit for reference.Failure to register warranty will limit the warranty to one year. 2.3 Amplifier Placement In general, t he location of your new CAD-50M Mkll is not critical. Certainprecautions must be takento ensureoptimum performance.Avoid extremelyhot locationssuchas nearradiatorsor other heating units.
- Page 9 Simplyflip theACrocker s witch upto the"on"position (thegreen LEDwill light). Observethat all tubesarelit (filaments). 3.3 Stand-By Operate Switch In thedown position theplate voltage will bein stand-by. Turning theswitch to the"up" positionwill bringuptheoperating B+voltageontheplates of thevacuum tubes.The RED LED will light whentheunit is ready. 3.4 Triode-Ultra/Linear Switch On thetop of thechassis in-between the6550outputtubesis locatedachromehandle...
- Page 10 If it becomes n ecessary to replace thetubesin theCAD-50MMkll amplifier,a matched set of output tubes of the samebrand should be used. A new tube kit is available from Cary Audio Design,Inc. You shouldget a yearsfrom the output tubeswith everyday usageandmany,manyyearsof usefrom the6SN7inputtubes.
- Page 11 4.3 FACTORY SERVICE Careful c onsideration hasbeen given to thedesign of yourCAD-50M Mkll amplifier to keepmaintenance problems t o a minimum.However, it is possible thatsome problems mayarisewhichcannot b e curedby tubesubstitution. A t thispointwe suggest you contact o ur Customer S ervice Department phone number (919)481-4494 to describe your problemin detail.
- Page 12 CAD 50M MK II Tube Placement 6550c Rear Front 6550c 6SN7 6SN7...
- Page 13 J eeu qoums .10)031es (.58 / (jt...
- Page 14 Rear Ultra-Linear Triode / Ultra-Linear switch settings. Switch is located on the top of the chassis Triode Front...
- Page 15 CAD-50 MK 11Bias Adjustment Bias IIL\ Bias Jack Positive 100 mA Negative Insert meter plug into biasjack. Adjust for 100mAreading on VOM or DC current meter. Readjustto 100mAafter after CAD-50 MK II is warmedup for 10minutes. Removeplug andenjoy the music! Note: Bias is factory preset;...
- Page 16 UNITED STATES LIMITED WARRANTY CaryAudioDesign, I nc.warrants t o theoriginal U nitedStates p urchaser foruse intheUnited States, thatthisproduct shallbefreefrom defects in material ( except t ubesandAF outputtransistors) or workmanship f or: ModelsCAD-211M? SLM-200andtheCAD-805, Five(5) yearsfrom dateof originalpurchase. Amplifiers andPreamplifiers, T hree(3) years from thedateof theoriginalpurchase. Digital Products, O ne( I)yearfrom originaldateof purchase.
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