Fisher X 100 B (1962–1964)
A stereo integrated tube amplifier from Fisher, introduced in 1962 and sold through 1964.
Overview
The Fisher X-100-B is a stereo integrated tube amplifier made by Fisher Radio Corporation. It came out in early 1962, stayed in the catalog through 1964, and was marketed as a high-end audio component. It has a tube preamplifier and a tube main amplifier section. The output stage uses 7868 beam-power tubes in push-pull. Controls include tone controls, a tape monitor switch, a high-cut filter and a loudness control. The preamplifier section runs on a DC ignition system. You can also connect a center speaker directly for 3D stereo playback.
Specifications
| Product type | Integrated Amplifier |
| Output tubes | 7868 beam-power output tubes |
| Tube complement | 6 x ECC83, 4 x 7868 |
| Diodes | 2 pcs |
| Frequency response | 10 Hz ~ 75 kHz +0 -1.5 dB |
| Input sensitivity | Tape head: 2mV, Phono: 3.5mV, Tuner/Aux/Tape play: 300mV |
| Tone control range | Bass: 22 dB at 50 Hz, Treble: 20 dB at 10 kHz |
| Weight | 10 kg |
| Original price | $169.50 |
Context
The X-100-B sat in the upper tier of its day. High Fidelity magazine noted in May 1963 that only three finer control amplifiers were available on the market.
Market
One example was listed for $450 obo in a recent sale, which points to some collector interest. Some owners recommend checking for drying-out capacitors during maintenance. The Miller Audio FAQ notes that the 5AR4/GZ34 rectifier may be a point of concern because of insufficient current reserve.
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