Harman Kardon Citation II Assembly And Operation Manual
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Harman Kardon Citation II Assembly And Operation Manual

Harman Kardon Citation II Assembly And Operation Manual

120 watt stereophonic basic amplifier
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Summary of Contents for Harman Kardon Citation II

  • Page 3: Harmonic Distortion

    BASIC SPECIFICATIONS SUSTAINED POWER OUTPUT: 60 watts per channel. PEAK POWER OUTPUT: 130 watts per channel. HARMONIC DISTORTION: Less than 0.5%, 20- 20,000 cycles per second at 60 watts. Less than 0.1%, 20- 20,000 cycles per second at 20 watts. Unmeasurable at normal listening level.
  • Page 4 FEATURES Use of video output pentodes in all low level stages for exceptionally wide frequency response and low distortion. Output stage consists of two KT88/6550’s per channel, conservatively operated in fixed bias, distributed load circuit. Multiple feedback loops for increased degree of usable feedback to greatly lower distortion without sacrifi cing stability.
  • Page 5 CITATION II CURVES...

  • Page 7: Technical Description

    The keynote is unparalleled performance and there has been no compromise made in the design of this magnificent instrument. Although the Citation II will perform satisfactorily with any high quality preamplifier, it is strongly recommended it be used with the Citation I or Citation IV stereo preamplifiers control center for optimum performance.

  • Page 8: Construction Information

    transformers well above 200,000 cycles. The combined use of these special output transformers in conjunction with video pulse amplifier techniques and multiple feedback loops have enabled us to achieve the ex ceptionally wide frequency response of two octaves above and below the normal range of human hearing. This design employs 2-KT88/6550 beam power pentodes in each channel, driven by video power pentodes used conventionally in pulse amplifiers and wide band industrial equipment such as co mputers.
  • Page 9 1. USE ONLY ROSIN CORE (NON-CORROSIVE) SOLDER! The solder you purchase should be clearly labeled for radio and television use. The usual composition is 60% tin and 40% lead indicated on the package label as 60/40. Do not use so-called non-corrosive paste. This compound is highly corrosive when heated and will destroy the insulation value of non-conductors and will quickly lead to erratic or degraded performance.

  • Page 10: Service Policy

    WARRANTY OF HARMAN-KARDON CITATION KITS For a period of 90 days following the original date of purchase, all parts supplied with Harman -Kardon Citation Kits are guaranteed by the manufacturer to be free from defects in material and workmanship when put to normal use and service.

  • Page 11: Assembly Procedure

    ASSEMBLY PROCEDURE These instructions are presented in a simple, step by step sequence to make assembly and wiring of your amplifier as easy as possible. Please take the time to read each step carefully before actually performing the work. A space is provided to check off each operation and will be helpful in preventing omissions or errors. After every 10 or 15 steps, stop and check your work to insure accuracy.
  • Page 12 ELECTROLYTIC BRACKET ASSEMBLY Refer to Pictorial Diagram #1. Orient bracket so that the U-shaped notches are downward with the larger U-shaped notch to the right. Check ( ) ( ) ¾ Mount selenium rectifier (SR1), using #6-32 x ˝ screw through top of bracket. Slip rectifier on screw, negative lug first and engage locating tab in the hole provided on the electrolytic bracke t.
  • Page 13 HARNESS CONSTRUCTION The cardboard harness jig (Pictorial #2) will enable you to build your harness easily and quickly. Careful work at this time will pay dividends in terms of appearance and easy final wiring. You will note that the jig has numerous scored rectangles with lines emerging from them. These are tabs to hold the wires in place as they are inserted in the harness.
  • Page 14 Check ( ) ( ) ¾ ⅜ ¼ Connect a white wire 19 ˝ long from 9 ( ˝) to 58 ( ˝). ( ) ( ) ¾ ⅜ ⅜ Connect an HI red wire 10 ˝ long from 38 ( ˝) to 13 ( ˝).

  • Page 15: Chassis Assembly

    The following capacitors are mounted to the rear (unprinted side) of the terminal board. The leads are bent over the edges of the board to connect the lugs which are on the front side of the board. Connect the leads snugly to the lower section of the lugs with one turn around the lug.
  • Page 16 Check ( ) ( ) ⅜ Install (6) nine pin sockets, V1 through V6, noting orientation. Use 4-40 x ˝ screws, lockwasher under nut. (See Figure E.) ( ) ( ) ⅜ Install (4) octal sockets, noting orientation. Use #6-32 x ˝...
  • Page 17 PRELIMINARY SWITCH WIRING Refer to Figure J. Each contact is identified by number. The front contacts (closest to shaft) are identified by S-1F, S-2F, etc. Similarly, the rear contacts (farthest from shaft) by S-1R, S-2R, etc. Make the following connections: Check ( ) ( ) Connect a jumper using bare wire from...
  • Page 18 Check ( ) ( ) ¼ ˝ V4-6 (S) to V6-6 (S). ( ) ( ) ¼ ⅜ ⅜ ˝ V5-4 & 5 ( ˝) (NS) to V6-4 & 5 ( ˝) (NS). Now solder pin 5 only on V5 and V6. ( ) ( ) 5˝...
  • Page 19 Check ( ) ( ) Yellow to V5-9 (NS). ( 3) ( ) ( ) Green to V5-8 (NS). ( 2) ( ) ( ) Gray to P4-6 (S). (63) ( ) ( ) Violet to P4-5 (S). (64) ( ) ( ) Gray to P4-3 (S).
  • Page 22 Check ( ) ( ) ½ ½ Cut leads to ˝ on a 270 ohm watt 10% resistor (red-violet-brown-silver) and connect between V7-6 (NS) and V7-4 (S). In the same manner, connect the following: ( ) ( ) ½ 270 ohm watt 10% resistor (red-violet-brown-silver) from, V8-6 (NS) to V8-4 (S).
  • Page 23 Check ( ) ( ) ¼ Cut brown lead to required length. Strip ˝ and tin. Connect to V7-3 (NS). ( ) ( ) Similarly, cut brown-white. Connect to V7-6 (S). ( ) ( ) Cut blue to required length. Connect to V8-3 (NS). ( ) ( ) Cut blue-white to required length.
  • Page 24 Check ( ) ( ) Connect shorter yellow lead from choke to Al (S). ( ) ( ) Connect red lead (55) from harness to C1 (S). ( ) ( ) Connect one of the blue leads (53 or 54) from harness to D1 (S). ( ) ( ) Connect the other of the blue leads (53 or 54) from harness to D2 (S).
  • Page 25 Check ( ) ( ) Connect a 12˝ white lead to TB1-8 (S), dress around bracket to rear of chassis and connect other end to T2-16 (S). Route as shown in Pictorial #8. ( ) ( ) Connect a 12˝ white lead from TB2-8 (S) to T1-16 (S). ( ) ( ) ½...
  • Page 26 Check ( ) ( ) ( ) 1K mmf or .001 mfd capacitor (value marked on body of capacitor) from TB1-41 (S) to TB1- 24 (S). ( ) ( ) ( ) 12K ohm 5 watt resistor (value marked on body of resistor) from TB1-11 (S) to TBl-25 (S). ⅜...

  • Page 27: Final Inspection

    FINAL INSPECTION Visually inspect all connections and wiring comparing against the master charts and manual. Rotate all four bias adjust controls located on the rear of the chassis (V7, V8, V9 and V10) fully clockwise for maximum bias. A.C. balance potentiometers between KT88/6550’s should be set in the mid-position.
  • Page 28 A.C. Balance Adjustment: A 60 cycle test signal has been provided so that the amplifier can be dynamically balanced. This signal is available next to the Channel B input jack. The upper jack is the input to the Channel B a mplifier and the lower jack is the “test signal”...

  • Page 30: Electrical Installation

    INSTALLING THE BOTTOM PLATE The bottom plate is easily installed by turning the amplifier over to rest on the transformers. ½ Install plastic feet to bottom plate with #6-32x ˝ screw, lockwasher and nut as shown in Pictorial 9. Place bottom plate to align with mounting holes on the lip of the chassis. The gold plated name plate will cover the opening in the chassis below the 12BY7A tubes.

  • Page 31: Protective Cover

    CONNECTING THE AMPLIFIER FOR 120 WATT MONOPHONIC OPERATION WITH SINGLE SPEAKER In order to operate the Citation II as a 120 watt monophonic amplifier it is necessary to fulfill two require - ments.

  • Page 32: General Information

    - tion. The Citation II power transformer is potted with a chemical compound called “PERMAFIL” which is specifically selected because of its high heat conductivity. “PERMAFIL” carries the heat away from the core and the winding to the outer can where it is rapidly dissipated.

  • Page 33: Resistance Readings

    VOLTAGE AND RESISTANCE CHARTS VOLTAGE READINGS 12BY7A 12BY7A 12BY7A 12BY7A 12BY7A 12BY7A KT88/6550 KT88/6550 KT88/6550 KT88/6550 150V 150V 150V 150V 0.6V AC 110V 110V 110V 110V 3.1V 3.1V 3.1V 3.1V 150V 150V 150V 150V 450V 450V 450V 450V 1.5V 3.1V 3.1V 1.5V 3.1V...
  • Page 34 REPLACEMENT PARTS LIST When ordering replacement parts be sure to specify the part number listed below. Parts Part Number Per Kit Description SHEET METAL PARTS P3273664 Chassis B3273668 Bottom Plate P3273669 Electrolytic Mounting Bracket TRANSFORMERS, CHOKE FT3273670 Power Transformer FT3273671 Output Transformer FC3273672 Choke...
  • Page 35 REPLACEMENT PARTS LIST (continued) Parts Part Number Per Kit Description TUBES, DIODES ZCOM3679 Silicon Diode (SD94A) (66-3284) (3679) KT88/6550 Tube 12BY7A Tube MOUNTING HARDWARE ⅜ KM4-40-6SG #4-40 x Lg. B.H.M.S. (binding head machine screw KL4-SG #4 Internal Tooth Lockwasher KN4-40SG #4-40 Hex Nuts ⅜...

  • Page 36: Electrolytic Capacitors

    REPLACEMENT PARTS LIST (continued) Parts Part Number Per Kit Description ELECTROLYTIC CAPACITORS JE3273784 4 mfd/450 volts (Minimite) JE3273681 40 mfd/525 volts JE3273682 200 mfd/250 volts JE3273851 200 mfd/250 volts (with insulating sleeve) JE3273683 20-20 mfd/150 volts (with insulating sleeve) JE3273783 50-50 mfd/450 volts MOLDED TUBULAR CAPACITORS JP-6-.22...

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