Yamaha CA-2010 (1978)
Yamaha's integrated amp that published its specs from phono input to speaker output, and then out-measured the separates it was built to replace.
Overview
The number to look at is 118 dB. That's the CA-2010's overall amplifier signal-to-noise ratio. Yamaha's own manual spells out what it means: play music with a 60 dB dynamic range, and the quietest passages still sit 58 dB above the noise floor. You don't normally see a figure like that printed on an integrated amplifier. It belongs to a separate preamp and a separate power amp, sold in two boxes, connected with two cables, and priced accordingly. Yamaha's argument was that you didn't need the two boxes.
This was an integrated amplifier - preamp and power amp in one chassis - and Yamaha built the pitch around a phrase it called "Balanced Design." The manual is direct about what that meant. Yamaha balanced the quality of the phono equalizer, the preamp, and the power amp stages so no single section became the weak link. It then published overall performance specs from Phono In to Speaker Out, instead of the usual practice of measuring the power amp and preamp separately. The implied claim is that a lot of competing gear looked better on paper because it was only ever measured in isolation, under conditions that had nothing to do with actual listening.
To make that argument concrete, Yamaha introduced its own measurement standard for the CA-2010: Noise Distortion Clearance Range, or NDCR. Instead of quoting maximum RMS power at a given distortion level, a figure measured at an unrealistic full-volume 0 dB, NDCR is taken at -20 dB, a normal listening level. It is measured from the more frequently used Phono In, through the equalizer amp, all the way to the speaker outputs. The CA-2010's measured NDCR range is 100 mW to 120 W, 20 Hz to 20 kHz. Yamaha's manual puts this in home terms: at a normal listening level, average power to the speakers runs 1-2 watts, a pianissimo passage sits around 100 mW, and instantaneous peaks reach 100 W.
The power amp section is where the distortion numbers get serious. Yamaha quotes IM and total harmonic distortion of 0.03% (20 to 20,000 Hz, 8 ohms, both channels driven at rated output). That is a 70% improvement over the company's first amplifier line, which had already stunned audiophiles at 0.1%. The figure applies in normal Class AB operation. The CA-2010 also has switchable Class A operation, a feature Yamaha notes it was the first to offer in a consumer amplifier. In Class A, the output transistors run without switching between elements. That eliminates the notch and crossover distortion present in all Class B designs, at the cost of lower maximum power. Yamaha's documentation is candid about the tradeoff: distortion in Class A begins to climb at 30 W, and at that point the user should switch to Class B. The recommended use for Class A is headphones, efficient speakers, and normal listening levels, with normal mode reserved for when full power is needed. The manual tells you exactly where each mode stops making sense.
The preamp side is just as well documented. From the Phono In terminals to the Pre Out jacks, the preamp section measures 0.003% distortion across the entire 20 Hz to 20,000 Hz range. Yamaha describes that as "just about the measurable limit for the finest test equipment." The equalizer circuit uses super-low-noise FETs developed specifically by Yamaha for this amplifier. They are used in matched pairs and housed in a single package, so both halves see identical temperature effects. They sit in a cascode-bootstrap current mirror circuit first introduced in Yamaha's C-2 preamplifier. The result is a 96 dB signal-to-noise ratio (10 mV input, IHF A network, inputs shorted) with less than 0.003% distortion from 20 to 20,000 Hz, Phono to Rec Out.
There's also a built-in moving coil head amp, switchable from the front panel, using a Yamaha-developed IC chip borrowed from the C-2. Its spec is 85 dB signal-to-noise for a 250 µV input. Yamaha claims that's rarely achieved for MC inputs and comparable to most competitors' high-level phono specifications. Distortion is under 0.03%, 20 Hz to 20,000 Hz for a 3 V output. In practice, an owner can run a low-output moving coil cartridge without buying an external head amp or accepting the limitations of a step-up transformer. HiFI-Stereo (June 1978, p.129) made this point in the CA-2010's period advertising. It noted that other manufacturers required the addition of an expensive preamp or step-up transformer to boost the low output signal of a moving coil cartridge, while Yamaha included a special head amplifier in the CA-2010, available with the flip of a switch on the front panel.
The front panel also carries a phono impedance selector. Yamaha describes it as a creative tool rather than a set-and-forget switch. It lets the user match cartridge loading instead of accepting whatever fixed impedance the designer chose.
The metering departs from convention too. The wide-range peak delay meters have a quick rise time of 100 µsec, fast enough to indicate even the briefest transient bursts. They respond to levels from 1 mW to 316 W with 8-ohm speakers without any range switching. They can also be switched to read the signal level from the Rec Out jacks, with actual-level calibration in millivolts. That lets an owner set recording levels precisely, keeping the signal above tape noise without pushing into distortion. Yamaha notes this metering arrangement mirrors the design used on its top-line C-1 preamp.
Protection is handled by an Area of Safe Operation sensing system. Special circuits monitor power transistor current and limit input level as soon as excess current is sensed. The same circuits trip if speaker impedance drops below 4 ohms, protecting both the amplifier and the speakers against shorts and misconnection. This matters more in Class A operation, where the transistors work full time and dissipate considerably more heat. Yamaha addresses that with massive power transistor heat sinks of low thermal capacity.
The rear panel has a Pre Out / Main In coupler arrangement with a switch that eliminates the need for external jumper cables between the preamp and power amp sections. The switch terminals sit inside the chassis, so they're shielded from the interference jumpers often pick up. The Pre Out jacks remain live even during normal operation. An owner can check the signal with an oscilloscope, feed it to a second power amplifier, or record from those jacks. A useful side effect is that the recorded signal can be processed first through the tone controls and filters.
Yamaha's manual claims the CA-2010 and the rest of its line offer "music fidelity audibly superior to many separate preamp and power amplifier combinations." The idea was that an integrated amplifier with every stage matched to the others could deliver the performance of separate components without the cost, the cables, or the extra shelf space.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ YAMAHA CA-2010 Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $2,650 Latest $2,536 │ │ Median $1,599 Trend — │ │ Low $635 Volume ~2/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $3,000 ┤ │ │ │ │ │ │ . .│ │ $1,971 ┤ . │ │ │ . . │ │ │ . . . . │ │ │ . .. │ │ $600 ┤. . │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │▄ ▄ ▄ ▄█ ▄ ▄ ▄ ▄ █▄ ▄│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-01 2026-04 2026-07│ └──────────────────────────────────────────────────────────────────────────┘
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