KLH Model Twenty-Four (1970s–1980s)

The KLH Model Twenty-Four is a stereo FM receiver, and it sits in a slightly confusing spot in KLH's catalog. It is described as the second version of the Model Twenty-Four, but what changed between versions isn't documented. The model appears to have been produced from the 1970s into the 1980s. The name was also used earlier for a compact stereo music system. KLH's own advertising in High Fidelity (December 1966, p.25) introduced a "Model Twenty-Four high-performance stereo music system" that shared its automatic turntable and general approach with the company's top-of-the-line Model Twenty. The receiver covered here is a different, later product.

As a receiver, the Twenty-Four was serious hardware. It was rated at 80 watts per channel into either 8 or 4 ohms, with frequency response of 20Hz to 20kHz ±0.5dB and total harmonic distortion of 0.1% at rated output. Signal-to-noise ratio was specified at 90dB. The FM tuner section used an FET front end, with sensitivity of 1.8µV, stereo separation of 40dB, and a capture ratio of 1.5dB. Inputs included MM phono (2.5mV, 47kΩ) and line (150mV, 100kΩ), with a 1V line output.

It was a big unit: 17.25 × 5.5 × 15.5 inches and 28 pounds, drawing 350W. Past the specifications, little else is recorded. There is no original price on file, no service history, and no owner or reviewer commentary to draw on. KLH is better remembered for its speakers, but the specs show it was also making high-powered electronics in this era.