Fisher KX 200 (1963–1968)
A stereophonic master control-amplifier from Fisher’s golden age of tube audio.
Overview
The Fisher KX-200 is a stereophonic master control-amplifier produced from 1963 to 1968. Manufactured by Fisher, it combines preamplifier and power amplifier functions in a single tube-based chassis. Known officially as "THE FISHER KX-200. STEREOPHONIC. Master Control-Amplifier," it was marketed as a high-performance integrated unit during a peak era for American hi-fi design.
Specifications
| Power output | 35 watts per channel into 8Ω (stereo) |
| Power output (IHF rating) | 80-watt (IHF) stereo power |
| Frequency response | 20Hz to 20kHz |
| Total harmonic distortion | 0.4% |
| Damping factor | listed as specification (value not provided) |
| Case options | Wood Case, rare factory metal case |
Design
The KX-200 features an all-tube design with DC filament voltage for all tubes except the push-pull power output stage. It was available in both wood and rare factory metal cases, and some units were assembled from kits, indicating a DIY-compatible construction approach.
Context
The Fisher KX-200 was introduced during the golden age of high-fidelity audio, a period marked by rapid innovation in stereo reproduction technology.
Market
The amplifier was originally priced at approximately $250. One documented issue involves failure of the output transformer on one channel. Units have been restored to AEA's 'Gold Level' standard, with some showing only a few minor imperfections. The KX-200 appears on current marketplaces including Reverb.com and eBay.
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