Several people have been in touch lately with questions on how to modify the PCB into something it isn't right now. Popular requests are balanced inputs and/or balanced outputs, and DC servo on the outputs.
Behold the new Muffsy Phono Preamp!
It'll be available on Tindie, very soon. Actually, it is available: https://www.tindie.com/products/skrodahl/muffsy-phono-preamp-kit/
YouTube user Blake G has posted a couple of vinyl-rips using the Muffsy Phono Preamp onto the video site. Although YouTube probably alters the bitrate, you can still get an idea on how the Muffsy Phono Preamp performs in his setup. His setup, btw, is:
Since only one extra resistor value is needed to get the higher impedances, it's been added to the kit. Now you can choose between these two options.
The input impedances on the Muffsy MC Head Amp can be changed to your liking. To help you find the right values, here's a nifty input impedance ...
After a lot of testing, ordering of components, assembling kits, more testing and writing build instructions, the Muffsy MC Head Amp kit has finally launched!If you're looking for a way to use low output MC cartridges with your Muffsy Phono Preamp, or any other MM phono stage, look no further! Get i...
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)
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
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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