SOLD: Neurochrome Modulus-86 Stereo Amplifier (DIY - Solid-State)Condition: VG (8 out of 10)
Dimensions: 18” x 17” x 4”
Asking: $950 + CONUS shipping + PayPal (or F&F)
Features:1. 40W - 8 Ω, < 0.01 % THD+N
2. 65 W 4 Ω, < 0.1 % THD+N
3. Balanced inputs
4. 120V (US) operation
Note:1. Chassis has no footers. It was built that way. Upon request, I will enclose some small rubber footers that I have used with this amp to good effect.
2. I was not planning to include a power cord with this amp. Most audiophiles have much nicer power cords already in-house. Upon request, I will enclose a very basic power cord with the unit.
If you haven’t heard of Neurchrome, please research them at
https://neurochrome.com/collections/power-amplifiers/products/modulus-86 and read about them on
www.diyaudio.com. Tom Christiansen is an amazing designer, one of the absolute best out there. This particular unit was built with top-of-the-line parts by the best (IMO) DIY builder on AudioCircle. His work can be seen in numerous places on
www.diyaudio.com. First-rate build all the way.
This a fantastic amp….truly. It’s the best amp I’ve ever owned, and I have had numerous wonderful boutique amps over the years (Air-Tight, VAC, Accuphase, Hypex NCore, ModWright, etc.). It has tremendous power and grip for its rating, nearly distortion-free, and never a single issue with it. And it is oh-so musical and clean at the same time. I have been highly, highly impressed by this. Selling only because I am moving to an all-active speaker configuration to reduce box count and footprint. I will miss playing this amp when it sells, I am sure.
Manufacturer’s information below. Please let me know if you have any questions on this. Thank you for looking at my ad.
The Modulus-86 Rev. is a 65 W composite amplifier which uses error correction to provide world class performance. It requires no adjustments and is built using readily available parts.
The Modulus-86 is optimized for ultra-low distortion – both harmonic distortion and intermodulation distortion. The result is a crystal clear and non-fatiguing sound that is revealing without being sterile. Due to the ultra-low noise floor of the Modulus-86, builders experience complete quiet between tracks even with high-sensitivity speakers.
The full set of specifications for the Modulus-86 Rev. are tabulated below.
Parameter Value NotesOutput Power 40 W 8 Ω, < 0.01 % THD+N
THD -136 dBc (0.000016 %) 1 W, 8 Ω, 1 kHz
THD -134 dBc (0.000019 %) 40 W, 8 Ω, 1 kHz
THD+N -117 dBc (0.00014 %) 40 W, 8 Ω, 1 kHz
Output Power 65 W 4 Ω, < 0.1 % THD+N
THD -133 dBc (0.000022 %) 1 W, 4 Ω, 1 kHz
THD -119 dBc (0.00011 %) 60 W, 4 Ω, 1 kHz
THD+N -114 dBc (0.00020 %) 65 W, 4 Ω, 1 kHz
IMD: SMPTE 60 Hz + 7 kHz @ 4:1 -106 dB 20 W, 8 Ω
IMD: DFD 18 kHz + 19 kHz @ 1:1 -119 dB 20 W, 8 Ω
IMD: DFD 917 Hz + 5.5 kHz @ 1:1 -109 dB 1 W, 8 Ω
Multi-Tone IMD Residual < -139 dB Ref.: 40 W AP 32-tone, 40 W, 8 Ω
Gain 20 dB
Input Sensitivity 1.8 V RMS 40 W, 8 Ω
Bandwidth 76 kHz 1 W, -3 dB
Slew Rate 14.4 V/µs 8 Ω || 1 nF load
Total Integrated Noise and Residual Mains Hum 13.7 µV RMS 20 Hz - 20 kHz, A-weighted
Total Integrated Noise and Residual Mains Hum 17.2 µV RMS 20 Hz - 20 kHz, Unweighted
Output DC Offset Voltage < ±2 mV Typical performance
Dynamic Range (AES17) 119 dB 1 kHz
SINAD 111 dB 5 W, 400 Hz
Common-Mode Rejection Ratio > 70 dB 120 Hz (typ.)
Damping Factor 642 1 kHz, 8 Ω
Damping Factor 214 20 kHz, 8 Ω
PCB Dimensions 90.2 × 69.2 mm
Finished Assembly Dimensions and Weight 91.2 × 69.7 × 27.5 mm
90 g (W × D × H)
All parameters are measured using a Power-86 with the recommended transformer (±30 V DC).
