Fisher Custom-Electra II (K-100) – 1966
The Fisher Custom-Electra II (K-100) is a tube-based receiver from 1966. It put a powerful amplifier and a high-quality AM/FM tuner on a single chassis. It was one of Fisher's flagship models. Stereo works through an external adapter, which fits the mono-to-stereo transition it came out of. The sound is warm, as you'd expect from vacuum tubes.
Specifications
| Feature | Specification |
| Model | Custom-Electra II (K-100) |
| Brand | Fisher |
| Year of Production | 1966–1967 |
| Category | Tube Receiver (Amplifier + Tuner) |
| Power Output | 100 watts (mono), per channel |
| Channels | Mono standard; stereo capable with external adapter |
| Impedance | 4–16 ohms |
| Output Tubes | 7868 (x4 typical for push-pull configuration) |
| Total Tubes | 12 tubes (including preamp and rectifier) |
| Tuner | Integrated FM/AM tuner with slide-rule dial |
| Inputs | Phono, Auxiliary, Front-panel stereo adapter input |
| Cabinet Finish | Walnut veneer with gold-anodized aluminum faceplate |
| Dimensions | 19" W × 7" H × 15" D (approx.) |
| Weight | 42 lbs |
Historical Context
The K-100 came out when mono was fading and stereo was taking over. Stereo LPs were gaining popularity, but many consumers still ran mono systems. Fisher built the K-100 as a mono powerhouse that could do stereo playback through an external adapter, such as the Fisher ST-6000.
Fisher Radio Corporation, founded by Avery Fisher, was known for high-fidelity sound and precision engineering. The K-100 follows that approach with solid construction, hand-selected components and a carefully laid out circuit. It has a gold-anodized faceplate and a walnut cabinet, which suited the high-end living rooms of the 1960s.
The Custom-Electra II is one of the last generations of tube-based receivers before solid-state took over. Collectors prize it today for its sound and its place in history. It offers reliability, clarity and the harmonic richness that tube fans still look for.
Sound Signature
The K-100 sounds warm, smooth and detailed, with a pronounced richness in the midrange. The tube amplification adds a natural harmonic distortion that many describe as "musical" or "lifelike." Bass is firm and well controlled for a tube design of its era. Highs stay clear without harshness. The integrated FM tuner is also highly regarded, with excellent sensitivity and stereo separation when used with the adapter.
Maintenance and Restoration Tips
Because of its age, the Fisher Custom-Electra II needs careful attention to run safely and well. Here are the key points for owners and restorers:
- Capacitor Replacement: The electrolytic and paper capacitors degrade over time and should be replaced (recapped) by a qualified technician. This is critical for preventing shorts, hum, or damage to other components.
- Tube Replacement: The 7868 output tubes are no longer in production and can be expensive or difficult to source. Consider using compatible substitutes or NOS (New Old Stock) tubes. Preamp tubes (e.g., 12AX7, 6BA6) are more readily available.
- Power Supply Check: Have the power supply inspected for voltage regulation and leakage. A failing power supply can compromise the entire unit.
- Tuner Alignment: If FM reception is weak or distorted, the tuner may need realignment. This requires specialized equipment and knowledge.
- Cleaning: Use isopropyl alcohol and contact cleaner for pots, switches, and jacks. Avoid abrasive cleaners on the faceplate or cabinet.
- Ventilation: Ensure proper airflow around the unit during operation to prevent overheating, especially during extended use.
Collectibility and Market Value
The Fisher Custom-Electra II (K-100) holds a collectibility rating of 7/10 among vintage audio enthusiasts. Buyers like the power, the build quality and the transitional design. Fully functional units in original condition command premium prices.
- Market Value: $400–$800, depending on condition, originality, and completeness (including knobs, feet, and documentation).
- Restoration Potential: High—well-restored units can exceed $900 in audiophile circles.
- Rarity: Moderate. While not extremely rare, fully operational examples with original tubes and finish are increasingly scarce.
Conclusion
The Fisher Custom-Electra II (K-100) is a respected 1960s hi-fi receiver. Collectors and tube enthusiasts still seek it out for its commanding presence, warm tube sound and innovative design for its time.
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