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dunaco Stereo 160, Owner'S Manual

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Summary of Contents for Stereo 160

Page 1: ...plifier Owner s Manual Stereo 160 Vacuum Tube Power Amplifier OFF ON BIAS DISPLAY TRIODE ULTRALINEAR POWER ON POWER OFF R STEREO 160 Vacuum Tube Power Amplifier V3 V4 V7 V8 LEFT CHANNEL RIGHT CHANNEL OUTPUT TUBE BIAS ADJUSTMENT ...

Page 2: ...ear Modes 7 Bias Adjustments general 8 Output Tube Bias Adjustment Procedure 9 Burn In Procedure for New Output Tubes 10 Tube Replacement 11 Alternate Tube Types 13 Minimizing Noise in the System 14 Warranty 15 Stereo 160 Specifications 16 Schematics 17 Stereo 160 PC Board Parts List 20 Please read this manual thoroughly before operating your new Stereo 160 ...

Page 3: ...Triode or Ultralinear mode Switching between the two is easily done via a front panel switch State of the art biasing circuitry allows you to easily attain precision bias settings for each of the output tubes through front panel adjustments and indicators Another special feature of the Stereo 160 is its adjustable Input Sensitivity This allows the Stereo 160 to be connected directly to components ...

Page 4: ...ar Panel Inputs and Outputs Inputs There are two input jacks located on the rear panel of the amplifier labeled Left and Right These connect to your preamplifier Line Outputs Never plug in or disconnect interconnect cables from other components to the amplifier when it is turned on To do so could cause a fuse to blow or even damage the speakers Outputs Match the impedance of your speakers to the a...

Page 5: ...llows you to connect audio components such as CD players directly to the Stereo 160 without using a preamplifier if desired Most power amplifiers have input sensitivities in the range of 1 to 1 5 volts If an amplifier has an input sensitivity of 1 volt this means that an input signal level of 1 volt will produce the full rated output power of the amplifier The Input Sensitivity on the Stereo 160 c...

Page 6: ... such as electric heaters microwave ovens clothes dryers etc Therefore you may need to set the output tube bias adjustments to suit your own location See section entitled Bias Adjustments general Fuses AC Line Fuse F1 10 Amp Fast Blow 100 or 120VAC 5 Amp Fast Blow 220 or 240VAC To remove the AC line fuse use a small screwdriver to push forward the tab near the center of the Power Entry Module Outp...

Page 7: ...he amplifier in Triode mode reduces the amplifier output power to about 1 2 of that in Ultralinear mode Triode mode also softens the clipping characteristics of the amplifier so it seems to need less output power Triode mode produces more lower even order harmonics whereas Ultralinear mode produces higher odd order harmonics Some people prefer Triode mode some people prefer Ultralinear mode The ch...

Page 8: ...r should be turned on for 15 minutes prior to bias adjustments Letting it idle for a full hour so that all components come up to full thermal equalization is also a good idea but not usually required Notes For newly installed output tubes the first three hours is the burn in period During this time bias settings need to be closely monitored because they go higher by themselves while the tubes burn...

Page 9: ...ckwise as this makes the bias setting even higher If an output tube bias indicator lamp cannot be adjusted for both green and red the associated output tube is probably faulty Adjusting the potentiometer for one lamp can seem to affect the lamps of the other tubes as well This is normal Allow each change to settle for a second or two before going on to the next trimmer potentiometer Repeat the adj...

Page 10: ...ter is turned fully counter clockwise Note If an output tube indicator lamp cannot be adjusted for both green and red the associated output tube is probably faulty 4 Adjust the bias potentiometer for each newly installed tube as follows a Turn the potentiometer clockwise to a point where its lamp goes off glows neither red nor green b Slowly turn the potentiometer counter clockwise again to the po...

Page 11: ...do not operate vacuum tube equipment on top of vibrating surfaces such as loudspeakers But if a tube is so sensitive that just having the amplifier turned on causes the microphonic sounds the tube will have to be replaced It can happen that a tube becomes microphonic with age or that it is only microphonic before it warms up or only after it warms up Because it is possible for oxidation to build u...

Page 12: ...vide 3 000 to 4 000 hours of use before they have to be replaced Some audiophiles replace them after as little as 1000 hours of use to keep the amplifier in top form It is not uncommon however for an output tube to become faulty during its normal lifetime The following conditions indicate possible output tube failure An output tube will not bias properly or refuses to hold its setting The amplifie...

Page 13: ...te part numbers without informing their customers first Some audiophiles feel strongly about which manufacturer and or particular version of vacuum tube to use for specific applications The tubes installed on your new Stereo 80 have been selected to provide the best sound and long life As of this writing vacuum tubes are still produced by manufacturers in Germany Siemens Russia Sovtek Czechoslovak...

Page 14: ...lugging the preamplifier s power cable into a three prong AC outlet However if the AC outlet itself does not provide a really good ground the preamplifier power cable can be plugged into a three to two prong adapter and a wire can be run from the tab on the adapter to the nearest cold water pipe Another solution to AC power cable ground loop hum problems is to plug the AC power cables from all of ...

Page 15: ...has been removed or defaced This warranty gives you specific legal rights and you may also have other rights which vary from state to state If service is required contact the dealer from whom you purchased the amplifier If that is not possible write Dynaco giving us Your name and address Make and model of your amplifier The amplifier s serial number When and where you purchased it copy of sales sl...

Page 16: ...B points INPUT SENSITIVITY 3V for full power output Input Sensitivity Control set to maximum INPUT IMPEDANCE 50k SLEW RATE 30V µS SIGNAL TO NOISE RATIO 90db below full output TUBE COMPLEMENT two 12AT7 two 6DJ8 four 6550 POWER CONSUMPTION 260 Watts AC LINE VOLTAGE 100V 120V 220V or 240V 50 60 Hz DIMENSIONS 17 Wide 7 75 High 15 Deep SHIPPING WEIGHT 45 lbs WARRANTY Three years parts and labor one yea...

Page 17: ... 2 5W C103 C105B C102 R119 R109 R104 R101 2M 47uF 22uF 2 0K 100pF 400v 1 2 12AT7 49 8 7 6 3 2 1 1M V5 630V R110 1 2 3 9 301 R102 301 R103 301 R105 301 R112 27K 3W 301 R111 6 7 8 C104 22uF 630V 11K R113 3W R115 R118 1K 1K 3 4 8 FB 6 6550 V7 6DJ8 V6 6550 V8 5 3 8 1 4 FB 7 8 ohm 4 ohm 2 ohm C R114 30K 5W 400V R116 R117 150K RIGHT OUTPUTS TRIODE ULTRALINEAR FB 5 K2 A FB 8 TRIODE ULTRALINEAR K2 B 5 1 R...

Page 18: ...C212 C213 10uF ZD3 200V 5W ZD6 200V 5W ZD12 200V 5W ZD9 200V 5W D3 D5 BLU SHIELDS XMR GRN YEL 820uF 350V C207 68uF 630V C218 12V GND 85V 4 7M R212 C219 68uF 630V 250V 35V C208 C209 820uF 820uF 350V 350V C205 180uF 350V 47K 5w R202 47K 5w R203 47K 5w R204 47K 5w R205 47K 5w R206 47K 5w R207 HV OUT TO T3 C252 R201B 100 120V 100V 0 0V 120V 0 0V L N FAST BLOW 10A 120V 5A 240V C251 THROUGH C254 ARE 01u...

Page 19: ...047F 11 13 12 8 9 10 1 4 1 4 1 4 1 4 4 1 6 5 2 3 LM339 U4 160V 160V Y3 12V Y4 Y7 Y8 GND R63 17 4K 127 R64 127 R65 13 3K R66 87mV 114mV R55 1 1K R56 R57 R58 1 1K 1 1K 1 1K BIAS ADJUST PC BOARD MOUNTED TO FRONT PANEL BIAS INDICATORS OFF ON SW3 P3 P4 P7 P8 85V P7 P8 25K 25K R73 R74 39K 39K V7 BIAS ADJUST V8 BIAS ADJUST M1 K1 K2 M2 TRIODE ULTRALINEAR R51 10K R52 10K R53 10K R54 10K CW CW CW 12V 2 1 3 ...

Page 20: ...11K 3W metal oxide R13 113 27K 3W metal oxide R12 112 30K 3W metal oxide R14 114 2 ohm 5W metal oxide R20 21 120 121 47K 5W metal oxide R202 203 204 205 206 207 Dual Potentiometer 50K audio taper P1 Trimmer Potentiometer 25K P3 4 7 8 Capacitors 01uF 1 4kV ceramic disk C251 252 253 254 100pF 400V polypropylene 5 C5B C105B 220pF 400V polypropylene 5 C1 101 330pF 400V polypropylene 5 C5A 105A 022uF 2...

Page 21: ... PCB mount for V3 4 7 8 Switch DPST AC Power SW1 Switch SPDT Triode Ultralinear SW2 Switch SPST Bias Lamps SW3 Relay 12V DPDT K1 2 Ferrite Beads FB1 through FB8 Choke 24 henry 600ma L1 Fuse 10 Amp fast blow 100 and 120VAC 5 Amp fast blow 220 and 240VAC F1 in power entry module Fuse 1 2 Amp fast blow F2 F3 Heat Sink Thermalloy P N 7019B MT HS 1 through HS6 Heat Sink Thermalloy P N 7025B MT HS7 8 He...

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