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In my opinion, the best Harman Kardon solid state preamplifier is not a Citation. Harman Kardon exited the high end market for a few years after HK Citation 21, but returned briefly in the mid 1990's.
The
best Harman Kardon
solid state preamplifier ever built is the Harman Kardon Signature AP2500. It is not exactly OLD, coming out on 1996. It was the golden era of solid state preamplifier with John Curl, Nelson Pass, James Borgiorno and the like at the peak of their design career and had the greatest impact on the industry. When Adcom, Parasound and others Japanese makes turned to IC, Harman Kardon Signature AP2500 stayed an all discrete circuit running in class A mode. It has a smooth natural sound, with excellent dynamics and wide and detailed stereo image. Harman Kardon HK-825 is known to be very good, but the AP2500 is in a class by itself and a vinyl lover's dream.
https://www.hifiengine.com/manual_library/harman-kardon/ap2500.shtml
One of the nice bonus is its all discrete class A headphone amplifier. You will have to spend more than the AP2500 to buy a headamp of equal or better quality.