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Der einseitige Harman Flyer vom Februar 1964

Der Werbetexter spricht darin von einer neuen Entwicklung ein paar Monate zuvor. Nachdem Max Grundig im Juni Aug. 1963 seinen Grundig SV 50 als den ersten Transistor Hifi-Stereoverstärker dieser Welt angepriesen hatte, kam der Aufschrei auf dem Fuße - entweder vom deutschen Importeuer oder direkt aus Amerika. Harman kardon hatte angeblich seine(n) Verstärker bereits etwas früher fertig. Ober er auch schon in der Produktion war, läßt sich nicht mehr feststellen.

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THE CITATION A
PROFESSIONAL SOLID STATE STEREO CONTROL CENTER

The Citation A, world's first professional solid state stereo control center, is a brilliant expression of computer age technology.

It is totally new in design, concept and performance. When you hear it, you will share the experience of its creators - the experience of genuine breakthrough and discovery; the experience of hearing music as you've never heard it before.

Citation A offers features never attainable before in audio design: virtually unlimited frequency response (+0 - 1/4db from 1 to 1.000.000cps), unmeasurable distortion and perfect phase linearity.

The A includes seven stages of gain mounted on a separate glass epoxy module. A new temperature sensing system surrounds each stage. Each individual circuit is automatically stabilized against the most extreme temperature variations. The result: unmeasurable distortion - less than .05% from 40° to 140° fahrenheit.

The use of the glass epoxy boards assures uniformity and strength. Each stage of gain receives thorough in-plant testing for noise, gain, distortion and square wave response. (The most accurate measure of the tone quality of audio equipment is the purity of the square wave. Citation A has a perfect square wave response with a rise time of less than one microsecond.)

Each module is slotted into a computer rack panel. Each provides 33db of gain with 34db of overall feedback. This unusually high degree of feedback results in lower distortion, improved tone quality and elimination of listening fatigue.

To maintain the stability of a preamplifier with a low-frequency cut-off of one cycle, the power supply must meet very rigid requirements. The Citation A power supply incorporates four Zener diodes and two transistors in a special new design which insures perfect regulation. No variation in line voltage can affect its stability or performance.

A hermetically sealed reed relay designed for high speed computer operation keeps the preamplifier turned off until the power supply has reached full regulation.

Since its introduction not so many months ago-Citation A has achieved the status of a classic in the tradition of other great classic instruments: the Brook triode; the Williamson basic; the early Hegeman-Brociner multiple-loop basics and, of course, the earlier Citations.

Today the "A" has the ideal mate in the new Citation B 80 watt stereo basic amplifier. The "A" is strikingly handsome and remarkably simple to operate. It will measurably improve the performance of any stereo high fidelity system.

Auf der Rückseite die absolut neuen Highlights:

Hier werden dem staunenden Betrachter die völlig neuen Halbleiter-Bauteile vorgestellt:

Beachten Sie das von Wolfgang Hasselbach aufgestempelte Datum oben rechts - Februar 1964

THE CITATION A - Highlights:

• Separate bass and treble step-type tone controls for each channel. Controls electrically out of the circuit when in the flat position to eliminate phase shift and transient distortion. • Convenient front panel stereo headphone receptacle. • Special broadcast-type scratch filter incorporated into treble cut positions for sharp roll-off without ringing. • Separate turnover and roll-off equalization switches to compensate for all records and tapes. • Solid-state fully regulated power supply employing transistors and Zener diodes assure extended low frequency and excellent transient response. • Individual amplifier and system on/off switches allow listener to turn off power amplifier when using headphones. • Separate front panel tape head adjust controls permit accurate equalization calibration for tape head wear.
• Low impedance emitter follower output permits the use of long connecting leads without affecting frequency response. • Glass epoxy modules mounted in computer-type rack panel for rigidity, professional appearance and easy accessibility. • Four ganged, close tracking gain control assures low noise and perfect control of volume. • Heavy duty potted power transformer. • Center channel output with separate gain control. • Push button switches for Stereo Reverse, Contour, Tape Monitor and Low Cut filter.

SPECIFICATIONS • CITATION A

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Frequency Response: From one to one million cycles per second, +0 -Wdb. Square Wave Response: Better than 1 microsecond in all function positions.
(Tone controls fiat.) Less than 5% tilt at 5 cycles per second. Harmonic

Distortion: Unmeasurable at 2 volts output from 20-20,000 cycles
per second. Intermodulation Distortion: Less than 0.05% from 40° to 140° fahrenheit at 2 volts. Noise: Low level phono: 70db below rated output at 5 mv. input reference. High level: 85db below rated output.

Sensitivity: High level input: 0.25 volts. Low level input: 1,5 millivolts. Rated Output: Two volts. Six volts maximum. A.C. Convenience Outlets: One individually switched for basic amplifier only. Three switched with preamplifier. On/Off Switches: Two individual power switches. One controls the power for the basic amplifier only; the other, the power for the preamplifier and associated equipment.

Function Selection: Six positions: Auxiliary. Tape Amp., Tuner, Phono 1, Phono 2, Tape Head. Mode Selector: Five positions: Stereo, Blend, A+B, Mon A, Mon B. Blend Control: Introduces variable amount of crossfeed between channel A and B. Rear section of control acts as center channel gain control.

Equalization Control: Separate Turnover and Roll-off to set individually, the
equalization of the low and high frequencies. Turnover: Tape Adjust,
NARTB, 800/RCA, RIAA, L.P., AES, 78. Roll-off: 0/78, 4/FFRR, 10.5/OLD
L0N, 12/AES, 14/RIAA, 16/LP.

Tone Controls: Professional step-type controls for each channel. Electrically out of the circuit in the flat position.

Balance Control: Zero to infinity type; frequency insensitive.

Contour Switch: Compensates for Fietcher-Munson effect at low listening levels.

Channel Reverse Switch: Interchanges Channel A and B for proper listening
orientation.
Low Cut Filter: Two position: Fiat, 75 cycle cut.
High Frequency Filter: Five positions incorporated into treble tone controls.
Special non-ringing circuit.

Tape Monitor Switch: Permits monitoring of tape while recording. Output Receptacles: Four main preamplifier outputs. One center channel output. Two tape outputs for recording.

Total Number Of Transistors: 33.

Special Features: Push-button selector switch, stereo headphone receptacle, special front panel tape head controls to trim equalization for any tape head. Cabinet installation from front with escutcheon remaing fastened to preamplifier. Simple attachment to mounting board. Dimensions: 14 1/2" wide x 5" high x 7" deep.
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harman kardon
A subsidiary of THE JERROLD CORPORATION in PLAINVIEW, NEW YORK
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