Wondering how the Muffsy MC Head Amp measures? Look below for the numbers.

• Topology: Dual mono
• Gain: 24.6 dB
• 0.3 mV input = 5 mV output
• 0.5 mV input = 8.5 mV output 
• Input impedance: 47 - 100 ohms, in four steps
• THD: < 0.1 % *)
• THD+N: < 0.6 % *)
• SNR:  71.8 dB, referenced to 0.5 mV input @ 1 kHz
• Frequen...

The signal to noise ratio (SNR) compares the level of the audio signal to the background noise. An SNR of at least 65 dB is what's needed to have a completely silent phono stage. The Muffsy Phono Preamp's SNR, with OPA2134, comes in at 79.46 dB as shown below.

The measurement of signal to noise ratio...

We've seen how the RIAA filter behaves with low and very low capacitor values. (See all simulation articles here) Now let's have a look at what happens if the capacitor values are higher than the recommended ones.

This is the Muffsy Phono Preamp with capacitor values that are 2.5% higher than specifi...

I wanted to know what happened to the Muffsy RIAA compliance if the capacitors were out of spec, and started with a plausible scenario where the capacitors were 3% below their stated values.

This time, lets see what happens if the capacitor values are extremely low. Let's say they're 10% below what ...

The RIAA equalization added to vinyl records can and do vary wildly, and you might rightfully say that a phono stage's RIAA compliance doesn't matter too much.

It's still a standard, and it should be one of the considerations when choosing a phono stage.

The Muffsy Phono Preamp uses Wima MKS2 capacito...