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About the Citation II
The Harman Kardon Citation II, designed by Stewart Hegeman and produced between 1959 and 1962, is a heavy, high-fidelity tube stereo power amplifier known for its exceptional engineering and sound quality. It features a pentode input stage using 12BY7 video pentodes for ultra-wide bandwidth exceeding 1 MHz, followed by a differential phase splitter and a pair of KT88 output tubes per channel. The amplifier delivers 60 watts per channel into 8 ohms with a frequency response from 18 Hz to 40 kHz (+0, -1 dB) at 60 watts, extending well beyond the audible range to reduce phase shift and distortion. It includes individual bias controls for each output tube, an AC balance control, and a bias meter for optimal tube performance. The output transformers are custom-designed, potted units with extremely low leakage inductance, enabling a high-frequency response up to 270 kHz. The amplifier has a damping factor greater than 18, total harmonic distortion less than 0.5% at 60 watts, and a signal-to-noise ratio of about 90 dB. It weighs approximately 70 pounds and measures 16.5 x 9 x 11.5 inches. Originally
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