McIntosh MX110 (1962)
Tube tuner and preamp in one box, with a blue meter glowing on the front.
Overview
McIntosh calls the MX110 "a landmark integrated preamplifier and tuner." It puts a high-performance FM/AM tuner and a fully-featured tube preamplifier on a single chassis. It arrived in 1962, and it's generally regarded as one of McIntosh's first integrated tuner-preamplifiers. Stereo FM broadcasting was just becoming mainstream, and the multiplex stereo capability made the MX110 a forward-looking purchase rather than a stopgap. The brand's advertising made the durability case directly. A 1965 advertisement in HiFi-Stereo (January 1965, p.11) argued that all tuners, amplifiers, and preamplifiers sound good when new, but only McIntosh units continue to sound good year after year.
The tuner and preamp share a power supply but keep their functions separate. There is no power amplification stage here - the MX110 feeds a separate power amplifier, which is how McIntosh expected customers to build a system. The preamp section uses 12AX7 and 12AU7 tubes across the line and phono stages, and the tuner section runs its own tube complement. Owners describe the tuner as having good sensitivity, and the front-panel analog tuning meter is how you find and hold a station.
The research page lists the weight at approximately 32 lbs (14.5 kg). A Korean spec block from riosound.co.kr lists 27.5 lbs. That's a gap of roughly four and a half pounds, and it's the kind of thing that happens when a spec block gets borrowed from a related model. Treat the weight as somewhere in the low thirties and don't quote either figure as gospel. What's not in dispute is that this is a heavy, densely packed piece of tube gear, and the point-to-point wiring and heavy-duty chassis construction are part of why.
Dimensions from the riosound spec block are 16 × 5-7/16 × 13 inches. Frequency response is listed as 20Hz to 20kHz, total harmonic distortion at 0.2%, and signal-to-noise ratio at 80dB on the line input. All of that comes from a single source. The numbers are plausible for a well-designed tube preamp of the era, but no period review in the available material verifies them.
Key Features
Unity Coupled Output in the Preamplifier Section
McIntosh's proprietary transformer-based output design is most famous from its power amplifiers, but the MX110 applies the same philosophy inside the preamp. The company's own description is that this design delivers low distortion and wide frequency response, even in preamplifier applications. In practice the output stage behaves more like a small power amp than a conventional line stage. The balanced output impedance is 600 ohms and the unbalanced output sits at 47k ohms. The 600-ohm balanced output lets the MX110 drive long cable runs to a power amplifier without the high-frequency rolloff that plagues high-impedance tube preamps. That matters if the amps sit across the room from the preamp.
FM Multiplex Stereo Tuner
The MX110 is described as one of the first consumer tuners capable of receiving stereo FM broadcasts. FM sensitivity is rated at 2.5 μV for 20 dB quieting, which is genuinely sensitive for a 1962 tube tuner, and owners still praise the tuner section decades later. The front panel carries an illuminated analog tuning meter for precise station finding and signal strength indication. There's also an AM section, though the research doesn't break out AM sensitivity separately. The tuner is the part most likely to need professional attention today. Weak reception or poor stereo separation usually means an alignment is due, not that the tuner is dead.
Tube Preamplification with 12AX7 and 12AU7
The line and phono stages run on 12AX7 and 12AU7 tubes. That's the classic McIntosh tube complement for this era. The sound is described as warm, smooth, and highly detailed, with rich midrange clarity, extended highs, and tight bass control. Phono input sensitivity is 2.5 mV for rated output, and the input sensitivity spec from the riosound block lists 3mV for moving-magnet cartridges and 300mV for line-level sources. A moving-magnet cartridge sits right in the zone for the phono stage. A moving-coil cartridge will need a step-up transformer or head amp, since the available documentation has no MC spec.
Comprehensive Tone Controls and Stereo Headphone Jack
Bass, treble, balance, and loudness controls are all on the front panel. The loudness compensation is useful at low listening levels, and the tone controls let you tame a bright room or a thin recording without swapping cables. There's also a stereo headphone jack, which allows private listening with full stereo separation. For a 1962 preamp, that's a practical inclusion a lot of competitors skipped.
Balanced and Unbalanced Outputs
The MX110 offers both balanced and unbalanced outputs, which most tube preamps of the era didn't have. Use the balanced output if your power amplifier accepts it. The 600-ohm impedance is low enough to drive long interconnects cleanly. The unbalanced output is there for the more common RCA-equipped amplifiers of the period. Either way, the MX110 is designed to sit at the front of a separates system, not to drive speakers directly.
The Blue Meter and the Wood Case
McIntosh's signature blue VU-style meter is on the front panel, illuminated and analog. On the MX110 it works as a tuning aid. Korean listings describe the case as wood - 우드케이스 - which is consistent with how these were typically ordered. The wood case can be damaged or missing on survivor units, so check it as carefully as you check the tubes.
Historical Context
The MX110 was introduced in 1962, at what the research describes as a pivotal moment in audio history - the dawn of stereo broadcasting and the rise of high-fidelity home audio systems. Its FM multiplex stereo capability made it a forward-looking choice just as stereo radio was becoming mainstream. The unit played a key role in establishing McIntosh as a dominant force in the high-end audio market during the tube era.
Period advertising for the brand leaned hard on durability. A 1965 HiFi-Stereo advertisement (January 1965, p.11) said all tuners, amplifiers, and preamplifiers sound good when new, but only McIntosh units continue to sound good "year after year, after year." That's marketing copy, not an independent verdict. The same ad quoted Audio's assessment of McIntosh as "unexcelled." The MX110's survival rate suggests the build quality was not entirely hype.
There's a documented service history. McIntosh service bulletins from the mid-1960s address specific issues with the MX110. A November 1965 bulletin covers a popping noise from the speakers when the switch controls are operated, traced to leaky 0.1 MFD disc ceramic coupling capacitors. The fix was to replace them with high-insulation-resistance mylar units, and the bulletin notes that MX110 equipment built since April 1965 already had this change. A March 1965 bulletin covers a modification to allow field adjustment of the MPX indicator light - installing a 1K control to compensate for tube and circuit variations. A June 1966 bulletin addresses the MX110 Z and X series specifically. These aren't recalls in the modern sense. They're the incremental engineering updates any tube component of this complexity would accumulate over a production run. If you hear popping when you turn a knob, check those capacitors first.
Collectibility & Value
The MX110 is a sought-after piece, and the market reflects that. The research page lists a market value range of $800 to $2,500, with the higher end reserved for fully restored, original-condition units with strong tuner performance. The collectibility rating is 8/10. The eBay data is messier. Recent completed sales range from $497 to $2,420, with a median of $1,900 across 13 sales in the past 12 months. The chart's high point is $4,825, and the low is $38 - the latter almost certainly a parts unit or a non-working example. Volume runs about four units a month, which is enough to establish a real market but not so many that you can be picky about condition.
Current listings show the spread: a "McIntosh MX110 Stereophonic Stereo Tube Tuner Preamp" at $1,650, a "McIntosh MX110Z Tube Tuner Preamplifier WORKING Serviced 202" at $4,495, a "McIntosh Mx110z Tube Preamplifier (Vintage)" at $2,939, and a "MCINTOSH MX110Z STEREO PREAMPLIFIER" at $4,650. Three of those four carry the Z suffix. The research doesn't explicitly describe the MX110Z or its relationship to the base MX110, and the caution note is clear: MX110Z facts shouldn't be merged into MX110 specs without a source that explicitly links them. What can be said is that the Z variant appears frequently in the secondary market and commands premium prices when it's been serviced. There's also an active Korean secondhand market - hifiplaza.co.kr has listed multiple MX110s, including one at 2,300,000 KRW. A 2009 odoo.co.kr listing paired an MX110 with an MC275 power amplifier and JBL L200 speakers as "a combination of legendary vintage classics."
Restoration is not optional on a unit this old. The standard list applies: replace old electrolytic and paper capacitors to prevent leakage, distortion, or damage to other components. Test and replace the 12AX7 and 12AU7 tubes as needed - NOS or tested equivalents are the way to go. Clean the potentiometers and switches with contact cleaner to eliminate scratchiness in the volume, balance, and tone controls. If FM reception is weak or stereo separation is poor, a professional tuner alignment is the fix. Verify the power supply transformer output and rectifier function before you trust the unit with your speakers. Collectors should preserve originality and document any replacements, because original parts and finishes increase value. The research is explicit that servicing should be done by a technician experienced with vintage tube gear. This is not a unit to learn on.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ MCINTOSH MX110 Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $4,825 Latest $1,900 │ │ Median $1,900 Trend — │ │ Low $38 Volume ~4/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $5,000 ┤ │ │ │ . │ │ │ │ │ $2,857 ┤ │ │ │ . . . │ │ │. . . . .│ │ │. │ │ $0 ┤ . . . │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ ▄ ▄ ▄ █ ▄ ▄ ▄ ▄ ▄ ▄│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-04 2026-06 2026-08│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
Recently sold on eBay: $497–$2,420 (median $1,900, based on 13 completed sales, past 12 months)
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