Harman Kardon Citation 19 (1975–1980)
A 34-to-36-pound straight-line power amplifier that trades gimmicks for gain stages.
Overview
The Harman Kardon Citation 19 is a no-frills power amplifier. It earned its reputation through measured performance, not marketing flash. Introduced in 1976, it arrived when Harman Kardon's separate components enjoyed widespread respect among serious listeners. The Citation 19 was the company's deliberate attempt to deliver high-end performance at a moderate price. Vintage Knob still calls it "one of the finest big solid-state amps of its day."
The Citation 19 is rated at 100 watts per channel into 8 ohms from 20 Hz to 20 kHz, with total harmonic distortion under 0.05 percent. Those numbers alone wouldn't have turned heads in the late 1970s. Plenty of receivers were posting similar figures. What set the amp apart was how it got there. It uses a "straight line" circuit: high open-loop gain, a closed-loop gain of 26 dB, and no capacitors or coils in the audio path. It's a direct-coupled, dual-channel design built around just three gain stages in its basic circuit. Owners describe the sound as clean and uncolored rather than artificially warm or hyped.
The damping factor is 100 at 8 ohms. That gives the amp firm control over speaker cones, which means tight, articulate bass on speakers that might sound loose with lesser amplification. Frequency response is rated at 20-20,000 Hz with a +0, - 0.5 dB tolerance. The unweighted signal-to-noise ratio exceeds 105 dB according to some documentation, with the IHF A-weighted figure listed at 95 dB. Input sensitivity for full rated output is 1.5 volts, so a modest preamp output drives it to its limits without strain.
The Citation 19 weighs roughly 34 to 36 pounds and measures about 17 to 17-1/4 inches wide, 5 to 5-1/4 inches high, and 12 to 12-5/8 inches deep. It needs proper rack space. It runs on 120 volts, 60 cycles. The power supply is a massive transformer paired with heavy reservoir capacitors, which provide the current reserve for loud dynamic peaks. High Fidelity (March 1988, p.22) described the new generation of Citation separates as going "far beyond its predecessors to create the ultimate listening experience."
Key Features
Straight-Line Circuit Topology
The "straight line" design is the defining feature of the Citation 19. Harman Kardon used the term for an amplifier that does nothing to the signal except make it louder. The circuit gets high open-loop gain with a closed-loop gain of just 26 dB, and it deliberately avoids capacitors and coils in the audio path. That means fewer reactive components to color or phase-shift the sound. According to available documentation, the result is an amplifier that puts sonic quality before raw power figures. Owners describe the presentation as honest and direct, with none of the veiled treble or bloated bass that plagued many contemporary solid-state designs.
Three-Stage Gain Architecture
Many amplifiers of the era stacked up numerous gain stages to reach their rated output. The Citation 19 uses only three: a voltage amplifier, a driver stage, and an output section with seven pairs of output transistors per channel. That's an unusual arrangement, and the source documentation states "7 pairs" explicitly. Fewer stages mean fewer chances for distortion and noise to pile up, which helps explain the low THD figure and the amp's reputation for clean, detailed reproduction.
Modular Serviceability
One of the most practical features of the Citation 19 is its modular construction. Each channel resides on its own PC board, containing a complete amplifier module with both driver and output transistors mounted on the same heat sink. These modules can be removed individually for service, which is a significant advantage for a forty-year-old amplifier. Rather than wrestling with a densely packed chassis to reach a failed component, a technician can pull an entire channel module and work on it at the bench. The heat sinks themselves feature wing-shaped fins, providing efficient cooling for the output stage during sustained high-power operation.
Output Relay Protection
The Citation 19 has a DC sensing circuit paired with an output relay to protect connected speakers from DC leakage. If the amp detects a dangerous DC offset, the relay disengages and isolates the speakers before damage occurs. It's a straightforward, effective scheme that has aged well. The protection circuit uses standard 8-pin IC op-amps, and replacements remain readily available.
Historical Context
The Citation 19 has a clear lineage within Harman Kardon's product family. According to available documentation, the Citation Nineteen replaced the Citation 16 in 1975, and by 1977 the Citation series consisted of the 14, 15, 16, and the new 19. Harman Kardon discontinued the 19 in 1978 and replaced it with the Citation 20 in 1979. Production dates vary by source - some list 1975-1978, others 1976-1979, and still others 1976-1980 - but the amp's place in the lineup is consistent across all accounts.
The original price was approximately $595 to $600. Harman Kardon built the Citation 19 to high standards with the explicit intention of competing with the top Japanese and American high-end amplifiers of its era.
Period advertising leaned heavily on the Citation heritage. High Fidelity (February 1970, p.24) noted that when Citation was introduced a decade earlier, it "immediately captured the imagination of audio experts throughout the world," with the magazine describing Citation as the "classic goal of amplifier design — a straight wire with gain." That phrase — "straight wire with gain" — became the benchmark that the Citation 19's designers clearly took to heart.
Collectibility & Maintenance
The Citation 19 isn't a collector's item in the sense of being rare or historically significant as an artifact. As one source puts it, it's "a sleeper for those who know it," a high-quality amplifier that performs well beyond its price point without the flagship cachet. It's widely acknowledged as a "giant killer," offering very high quality without the flagship price tag.
Buyers should know what the Citation 19 is and isn't. It's a power amplifier only. There's no volume control, no phono input, and no preamp section. It needs a separate preamplifier to work in a system. And while 100 watts per channel is ample for most speakers, it may be less than some other amplifiers in its class, particularly with inefficient modern speakers in a large room.
A forty-plus-year-old amplifier comes with maintenance realities. The output amplifier modules on the modular PC boards may need re-soldering or re-capping over time, as the electrolytic capacitors dry out after decades of use. The DC sensing circuit can fail intermittently, and the 47 uF capacitor in that circuit is a known trouble spot. If the amp doesn't power on, the output relay and its driving transistor are the first things to check. The unit uses many standard components, including those 8-pin IC op-amps in the protection circuit, so replacements are available without hunting for obsolete parts.
According to owners, the Citation 19 remains a good match for both vintage and modern speakers, and its straight-line design means it doesn't impose a sonic signature on whatever is connected to it.
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