Fisher ALLEGRO-A-9 & A-19: The Pinnacle of Tube Preamplification
The Fisher ALLEGRO-A-9 and ALLEGRO-A-19 are two closely related preamplifiers from Fisher Electronics, made in the late 1960s. They get less attention than Fisher's powerhouse amplifiers like the 500C or the 800D. Collectors of vintage tube gear still like them for the design, the understated performance and the sound.
Historical Context: Fisher at the Height of Hi-Fi
The ALLEGRO series came out in 1968. Fisher was founded by Avery Fisher in 1945 and had already built a reputation for components that paired laboratory-grade specifications with a good understanding of music reproduction. The ALLEGRO line, including the A-9 and A-19 preamplifiers, was positioned as a premium offering. It was aimed at the serious listener who wanted transparency and nuance over flash or excessive features.
The A-9 and A-19 were part of Fisher's "ALLEGRO" family, which reportedly also included the A-7 tuner and A-8 phono preamp. The units shared a minimalist look: clean black faceplates, brushed aluminum trim and few controls. The A-9 and A-19 were reportedly often paired with Fisher's companion power amplifiers, such as the 500C or 400B, to make a complete tube-based system.
Technical Specifications
While the A-9 and A-19 are often mentioned together, they differ slightly in functionality and target use:
| Specification | Fisher ALLEGRO-A-9 | Fisher ALLEGRO-A-19 |
| Year Introduced | 1968 | 1968 |
| Type | Tube Preamplifier | Tube Preamplifier |
| Tubes Used | 3 x 12AX7 (7025), 1 x 5Y3 rectifier | 3 x 12AX7 (7025), 1 x 5Y3 rectifier |
| Inputs | 2 Line, 1 Phono (MM) | 3 Line, 1 Phono (MM) |
| Outputs | 1 Main Out, 1 Tape Out | 1 Main Out, 1 Tape Out |
| Frequency Response | 20Hz – 20kHz ±1dB | 20Hz – 20kHz ±1dB |
| Total Harmonic Distortion | <0.5% at 1kHz | <0.5% at 1kHz |
| Input Impedance | 100kΩ (Line), 47kΩ (Phono) | 100kΩ (Line), 47kΩ (Phono) |
| Output Impedance | 600Ω | 600Ω |
| Power Supply | Internal transformer, tube rectified | Internal transformer, tube rectified |
| Dimensions (W×H×D) | 17" × 5.5" × 12" | 17" × 5.5" × 12" |
| Weight | 22 lbs | 22 lbs |
The primary distinction lies in the number of line inputs: the A-9 offers two line-level inputs (ideal for a tuner and tape deck), while the A-19 adds a third, catering to users with more source components. Both feature a dedicated moving magnet (MM) phono stage with RIAA equalization, essential for vinyl playback in the era before standalone phono preamps became common.
Sound Characteristics and Performance
The ALLEGRO-A-9 and A-19 are known for a warm, natural tonal balance. Some of their contemporaries leaned toward clinical precision. These preamps give a slightly lush midrange, smooth highs and a forgiving character that makes even lesser recordings enjoyable.
The phono stage is the standout. It uses 7025 low-noise tubes (a premium version of the 12AX7), and the A-9 and A-19 pull rich detail from vinyl without harshness or sibilance. Bass is well controlled and articulate, never bloated, which was a common problem in tube designs of the era. The line stage is equally refined, with a quiet noise floor and excellent channel separation.
One of the most praised aspects of these preamps is their spatial presentation. They create a wide, three-dimensional soundstage with precise imaging, so listeners can hear where instruments sit in the recording space. Combined with their dynamic expressiveness, that makes them good partners for vintage speakers like AR, Advent or KLH.
Notable Features and Innovations
Minimalist by today's standards, the ALLEGRO-A-9 and A-19 still had several advanced features for their time:
- Dual-Mono Signal Path: The left and right channels are believed to be kept largely separate from input to output, helping to minimize crosstalk and preserve stereo integrity.
- High-Quality Passive Components: Fisher reportedly used carbon composition resistors and paper-in-oil capacitors—components known for their musicality, though less stable over time than modern equivalents.
- Tube Rectification: The use of a 5Y3 rectifier tube (instead of solid-state diodes) contributes to a softer power-up and a more “organic” power delivery, often associated with a smoother sonic character.
- Balanced Design Philosophy: Fisher engineers focused on simplicity and signal purity. There are no tone controls on either model—only volume, balance, input selection, and a mute switch—reflecting a purist approach to audio.
The front panel layout is simple, with large, knurled aluminum knobs and crisp labeling. There are no tone controls. Some will see that as limiting, but it fits Fisher's belief that a preamp should be a transparent conduit, not a colorizer.
Common Issues and Maintenance
As with any vintage tube equipment, the ALLEGRO-A-9 and A-19 need careful attention to stay in good condition. Common issues include:
- Aging Capacitors: The electrolytic and paper-in-oil capacitors degrade over time, leading to hum, reduced bass response, or channel imbalance. A full recapping by a qualified technician is often recommended for units that haven’t been serviced in decades.
- Tube Wear: The 12AX7/7025 and 5Y3 tubes should be tested or replaced if the unit exhibits noise, low output, or failure to power up.
- Oxidized Controls: Pots and switches can become noisy due to oxidation. Cleaning with contact cleaner or replacement may be necessary.
- Power Supply Stress: The tube rectifier and transformer can fail if the unit has been stored improperly or subjected to voltage fluctuations.
Despite these issues, the A-9 and A-19 are generally sturdy units. Their point-to-point wiring and high-quality construction help long-term reliability when properly maintained.
Current Market Value and Collectibility
The Fisher ALLEGRO-A-9 and A-19 are moderately collectible among vintage audio enthusiasts. They are not as sought-after as Fisher's flagship amplifiers, but they are prized for their sound and their compatibility with classic systems.
As of 2024, working units in good cosmetic condition are reported to sell for $400 - $700. Fully restored or NOS (New Old Stock) examples reportedly command higher prices. Units with original tubes and documentation are especially desirable. Interest in tube-based systems and the resurgence of vinyl have helped support values.
Conclusion: A Legacy of Sonic Purity
The Fisher ALLEGRO-A-9 and A-19 lack the name recognition of Fisher's more powerful amplifiers. They are not about power or features. They are about musical truth, delivered with warmth, clarity and elegance.
For anyone building a period-correct system or looking for the lush, organic sound of tube electronics, the ALLEGRO-A-9 and A-19 remain good choices. They are working components that still deliver a listening experience as engaging as it was in 1968.
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