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, built by Fisher from 1963 to 1968. It puts the preamplifier and power amplifier in one tube chassis. The official name is "THE FISHER KX-200. STEREOPHONIC. Master Control-Amplifier," and Fisher sold it as a high-performance integrated unit at a peak time 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 is an all-tube design. Every tube runs on DC filament voltage except the push-pull power output stage. It came in a wood case or a rare factory metal case. Some units were assembled from kits, so the construction was friendly to DIY builders.
Context
The Fisher KX-200 came out during the golden age of high-fidelity audio, when stereo reproduction technology was changing fast.
Market
The amplifier originally sold for approximately $250. One documented problem is failure of the output transformer on one channel. Some units have been restored to AEA's 'Gold Level' standard, with only a few minor imperfections left. The KX-200 shows up on current marketplaces including Reverb.com and eBay.
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