Fisher 400-CX (1961–c.1964)

It has more knobs than a mad scientist's console, and every one of them feels like a direct line to the golden age of hi-fi.

Overview

The Fisher 400-CX is a command center, not just a preamplifier. It's built like a tank and wired with ten vacuum tubes plus two diodes. Fisher Radio Corporation designed this stereo control amplifier for listeners who wanted total command over their signal path. It was introduced in 1961 and likely produced through the mid-1960s. Even in Fisher's respected lineup it stands out for its sheer density of features, and it was a high-end tube preamp at a time when integrated receivers were more common.

Unlike Fisher's better-known tube receivers, the 400-CX is a dedicated preamplifier. It handles source selection, phono equalization, tone control, and volume, and leaves the power amplification to a separate unit. That made it a more specialized, higher-end product, aimed at serious audiophiles building modular systems. It's often confused with the earlier Fisher 400 receiver, but they're entirely different beasts. The 400-CX is a preamp, not a receiver, and it arrived later, reflecting Fisher's push into component-based high fidelity.

Owners report a clean, quiet performer with an exceptional phono stage, which counted for a lot when turntables were the primary source. The 28 individual controls look overwhelming at first glance, but they give a level of granularity that modern gear rarely matches.

Specifications

Type	Tube type control amplifier
Output voltage	2.5V
Input sensitivity Mic, Tape head	1.5 mV
Input sensitivity Phono	2.8 mV
Input sensitivity High level	200 mV
Frequency response	10 Hz to 25 kHz ± 1 dB
Vacuum Tube Complement	10 tubes total
Diode Complement	2 pcs
External dimensions	384 mm (W) x 122 mm (H) x 305 mm (D)
Weight	8.2 kg
Number of controls	twenty-eight controls
Number of inputs	eighteen inputs

Key Features

Control Central

With twenty-eight controls and eighteen inputs, the 400-CX makes you feel like you're running a broadcast studio. Every function, from source selection to tone shaping to balance adjustment, gets its own knob or switch. The number of inputs was extraordinary for its time. Users could connect multiple turntables, tape decks, tuners, and even auxiliary recorders without switching boxes or compromises.

Phono Stage with Flexibility

The phono section is one of the 400-CX's standout features. It includes variable equalization curves, so users can tailor the RIAA response to match different cartridges or record pressings. That was a rare level of adjustability in the early 1960s. For collectors and vinyl enthusiasts today, the flexibility is still a major draw, especially with older or non-standard records.

Center Channel Output

The center channel output was ahead of its time. It's designed to feed a third amplifier and speaker, and it aims to improve stereo sound distribution - essentially an early nod to what would later become surround sound. This center output is unaffected by the main volume or tone controls, so the center speaker gets a consistent signal regardless of listening level.

Remote Ready

The 400-CX was compatible with the optional Fisher RK-1 remote control, which handled volume and balance. Special jacks on the rear panel allowed quick connection, making this one of the earlier preamps to offer remote functionality. The remote is now a rare and sought-after accessory, and finding one with a working unit can significantly increase a 400-CX's value.

Convenience and Build

The rear panel includes switched AC outlets, so users can power associated components like tape decks or tuners from the same unit and turn everything on with a single switch. Fisher used heavy construction, point-to-point wiring, and custom transformers, and the 400-CX was built to last. It weighs 8.2 kg and is 384 mm wide.

Historical Context

Fisher didn't keep the 400-CX in its catalog for long. Like the other two preamplifiers the company produced, it had a relatively short production run. That wasn't unusual, since Fisher was known for iterating quickly and refining designs, but it does mean the 400-CX is less common than some of their more enduring receivers. The 400-CX-2 variant appears to have lasted longer, possibly into 1967 or 1968, surviving until Fisher phased out tube equipment entirely.

At the time, the high-end preamplifier market was competitive, with brands like H.H. Scott dominating the space. The fact that Scott "had thrown in the towel" around this period suggests shifting market dynamics, perhaps a move toward integrated designs or solid-state technology. Fisher kept making tube-based preamps like the 400-CX even as the industry began to change.

Collectibility & Value

The Fisher 400-CX is highly regarded among vintage tube preamp collectors, particularly for its outstanding phono section and clean, quiet signal path. It has quirks. One documented unit review noted a faint hum at high volume when no signal was present, and the low filter switch was described as ineffectual. These aren't dealbreakers, but buyers should know about them.

Most units on the market today need servicing. Aging capacitors are the most common issue, and full capacitor replacement sets are available, including filter capacitor rebuild kits priced around $147 - $165. Faceplate jewel sets, the little chrome-ringed lights, can be replaced for about $75, which helps restore the unit's original glow. Cracked AC outlets and missing feet (especially on console-pulled units) are also frequently reported problems.

The 400-CX-2 variant has an additional known failure point. The 330 ohm 3-watt resistor connected from the rectifier tube to the first filter capacitor is a common failure. It's a small part, but its failure can take the whole unit offline, so it's a smart preemptive replacement during restoration.

Current market prices for functional units aren't documented in the fact sheet. The availability of service parts and the demand for rare accessories like the RK-1 remote suggest the 400-CX holds steady collector interest. It's not a "plug-and-play" vintage piece, and you'll likely need to budget for a recapping.