Fisher 400-CX (1961–c.1964)

Name: Fisher 400-cx
Brand: Fisher

It’s got 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 isn’t just a preamplifier—it’s a command center. Built like a tank and wired with ten vacuum tubes plus two diodes, this stereo control amplifier from Fisher Radio Corporation was designed for listeners who wanted total command over their signal path. Introduced in 1961 and likely produced through the mid-1960s, the 400-CX stands out even among Fisher’s respected lineup for its sheer density of features and its role as a high-end tube preamp during a time when integrated receivers were more common.

Unlike Fisher’s better-known tube receivers, the 400-CX is a dedicated preamplifier—meaning it handles source selection, phono equalization, tone control, and volume, but leaves the power amplification to a separate unit. That alone 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 it as a clean, quiet performer with an exceptional phono stage—a big deal in an era when turntables were the primary source. Its 28 individual controls might look overwhelming at first glance, but they reflect a level of granularity that modern gear rarely matches. This was high-end audio before simplification became a selling point.

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 is the kind of preamp that makes you feel like you’re running a broadcast studio. Every function—from source selection to tone shaping to balance adjustments—is handled with dedicated knobs and switches. This isn’t minimalism; it’s maximalist audio engineering at its peak. The sheer number of inputs was extraordinary for its time, allowing users to 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, letting users tailor the RIAA response to match different cartridges or record pressings—a rare level of adjustability in the early 1960s. This wasn’t just about convenience; it was about precision. For collectors and vinyl enthusiasts today, that flexibility remains a major draw, especially when playing older or non-standard records.

Center Channel Output

One feature that feels ahead of its time is the center channel output. Designed to feed a third amplifier and speaker, this output aims to improve stereo sound distribution—essentially an early nod to what would later become surround sound. Notably, this center output is unaffected by the main volume or tone controls, ensuring a consistent signal to the center speaker regardless of listening levels. It’s a clever implementation that shows Fisher was thinking beyond basic stereo imaging.

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 for quick connection, making this one of the earlier preamps to offer remote functionality. That remote is now a rare and sought-after accessory—finding one with a working unit can significantly increase a 400-CX’s value.

Convenience and Build

The rear panel includes switched AC outlets, letting users power associated components like tape decks or tuners from the same unit—handy for turning everything on with a single switch. Combined with Fisher’s robust construction, point-to-point wiring, and custom transformers, the 400-CX was built to last. Its 8.2 kg weight speaks to the heft of its internal components, and the 384 mm width gives it a commanding presence on any rack.

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. This wasn’t unusual; 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’s persistence with tube-based preamps like the 400-CX shows a commitment to analog purity, 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. That said, it’s not without 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 they’re worth noting for potential buyers.

Most units on the market today require 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—those 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.

For the 400-CX-2 variant, there’s 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.

While 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—you’ll likely need to budget for a recapping—but for those who love hands-on restoration, it’s a rewarding project with excellent sonic payoff.