Fisher FM-100-B (1963)
The Fisher FM-100-B is an FM-only tuner built from 1963 to 1964. Fisher Radio Corporation made it for audiophiles and early adopters of FM stereo broadcasting, during the golden era of tube-based equipment. It has excellent selectivity and low noise, which were the marks of a well-engineered tube tuner of the period.
It has no built-in amplification. Fisher meant it to be paired with high-quality preamplifiers and power amplifiers of the time, as the front end of a premium audio system. The design is "stereo-ready." With an external multiplex adapter, it could pick up the FM stereo broadcasts that were just beginning to roll out in the early 1960s.
Specifications
| Feature | Specification |
| Model | FM-100-B |
| Brand | Fisher |
| Year of Production | 1963–1964 |
| Category | FM Tuner (Receiver Component) |
| Tubes | 5: 6AQ8, 6BA6, 6AU6, 6BE6, 6AL5 |
| Power Output | N/A (Tuner only, no amplification) |
| Impedance | Unknown |
| Sensitivity | 1.8 μV for 20 dB quieting (FM mono) |
| Tuning Display | Slide-rule dial with calibrated scale |
| Key Features | FM-only reception, AFC switch, stereo-ready with external multiplex adapter, tube-based front end |
| Audio Output | Line-level audio output for connection to external amplifier |
| Construction | Tube-based analog circuitry, metal chassis, analog tuning |
| Dimensions | 19" (W) × 7" (H) × 10" (D) (approx.) |
| Weight | ~20 lbs |
Historical Context
The FM-100-B arrived just as stereo FM radio was starting. AM dominated home listening in the 1950s, and in the early 1960s interest was growing in FM's superior sound quality and noise-free transmission. Fisher was already renowned for its high-end tube amplifiers and tuners, and positioned the FM-100-B as a precision instrument for serious listeners.
Many consumer-grade tuners of the time were more basic. The FM-100-B has a high-quality RF front end and excellent selectivity. It tunes smoothly thanks to its precision slide-rule dial and mechanical counter. It also has an AFC (Automatic Frequency Control) switch, which locks onto stations and reduces drift. Drift was a common issue with early FM receivers.
The FM-100-B did not natively decode stereo, since the stereo multiplex standard was still new. It was designed to work with external stereo adapters, which made it a forward-looking choice for enthusiasts eager for the future of radio.
Sound Signature
The FM-100-B has the warm, smooth, detailed sound characteristic of tube-based tuners. Its analog circuitry gives FM broadcasts low background noise and strong station capture. The 6BE6 converter and 6BA6 IF amplifier tubes contribute to its excellent sensitivity and selectivity, and let it pull in weak stations with clarity.
Well-maintained examples of the FM-100-B can outperform many later solid-state tuners in musicality and analog warmth, which makes it a favorite among vintage audio collectors and tube enthusiasts.
Maintenance and Restoration Tips
Like all vintage tube equipment, the Fisher FM-100-B needs careful maintenance to perform reliably and safely. Common issues include:
- Aging capacitors: Electrolytic and paper capacitors degrade over time and should be replaced to prevent failure or damage.
- Tube wear: While tubes can last decades, testing or replacing them (especially the 6BE6 and 6BA6) ensures optimal performance.
- Alignment drift: The IF and RF stages may require realignment for peak sensitivity and selectivity.
- Dirty controls and switches: Use contact cleaner on volume/tone controls and switches to eliminate crackling.
- Power supply concerns: Check the power transformer and wiring for insulation breakdown, especially if the unit has been stored for years.
Restoration Tips:
- Always power up vintage tube gear gradually using a variac to avoid shocking old components.
- Replace all capacitors before extended use.
- Clean the slide-rule dial mechanism gently to preserve its smooth operation.
- Use a proper external stereo decoder (e.g., Fisher PX-100 or similar) to unlock stereo FM capability.
Collectibility and Market Value
The Fisher FM-100-B holds a moderate level of collectibility, rated 6/10, due to its solid build quality, historical relevance, and appeal to tube audio enthusiasts. It is not as rare as some of Fisher's later models, but it remains a respected piece of early 1960s high-fidelity equipment.
Market Value: $100–$250
- Unrestored units in working condition typically sell at the lower end.
- Fully restored models with replaced capacitors, tested tubes, and clean cosmetics command higher prices.
Collectors value originality, so keeping the factory tubes and unmodified circuitry can increase appeal, even if restoration is eventually needed.
Conclusion
The Fisher FM-100-B is a vintage tuner from the early days of high-fidelity FM broadcasting. It has precision engineering, warm tube sound, and a forward-thinking design, and it remains a rewarding piece for restorers, collectors, and analog audio lovers.
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