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Muffsy Phono Kits
Hifi Preamps for your Record Player

Schematic: Muffsy Phono Preamp PP-4 / PP-3 Rev A

Muffsy Phono Preamp PP-3 Rev A
Schematic for the Muffsy Phono Preamp PP-4 / PP-3 Rev A (single channel)

LTSpice Simulation: Muffsy Phono Preamp PP-4 / PP-3 Rev A

This LTSpice simulation of the Muffsy Phono Preamp uses LT1792 and LT1037 that are quite similar to the OPA2134/LM4562 combo. The "Laplace"-thingie is the inverse RIAA input signal.

Muffsy LTSpice Simulation
Muffsy Phono Preamp LTSpice Simulation File

Schematic: Muffsy MC Head Amp MH-1

Schematic for the Muffsy MC Head Amp MH-1

Schematic: Muffsy Hifi Dual Power Supply

Schematic for the Muffsy Hifi Dual Power Supply
Muffsy Relay Input Selector - Schematic
Schematic for the Muffsy Relay Input Selector

Muffsy Phono Preamp Specifications:

Total Harmonic Distortion: 0.00081%
Total Harmonic Distortion + Noise: 0.01935%
Signal to Noise Ratio: 82.3 dB (0 dBV output)
Intermodulation Distortion: 0.0195% (ITU-R)

Crosstalk: -102 dB

Dynamic Range: > 110 dB (THD+N < 1%)

RIAA Compliance: +/- 0.15 dB (20-20.000 Hz)

RIAA Equalization: Passive

Gain at 1 kHz: 32-43 dB, in four steps

Input Impedance: 17k-150k ohm, in fifteen steps

Input Capacitance: Optional

PCB Size: 84 x 56 mm

Muffsy MC Head Amp Specifications:

Total Harmonic Distortion: < 0.1%

Total Harmonic Distortion + Noise: < 0.1%

Signal to Noise Ratio: 71.8 dB (rel to 0.5 mV input)

Intermodulation Distortion: 0.001% (ITU-R)

Dynamic Range: > 110 dB (rel to 0 dBV)

Frequency Response: +0 / -0.1 dB (20-20.000 Hz)

Gain: 24.6 dB

Input Impedance: 50-300 ohm, in four steps

PCB Size: 84 x 59.4 mm

Measurements at 1 kHz, 0 dBV output, if not stated otherwise

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