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Bartolini MK-1 Preamp , Why is this considered a poor preamp?

I can clearly say that preamp is a bad preamp.

That preamp detracts from the product's marketability.

I purchased a B5 Element equipped with it, and I was disappointed by the unnatural high frequencies and the lack of fullness that remained unfulfilled no matter how I adjusted the knob.

However, after I finished the process of removing the preamp, my instrument began to produce a sound comparable to instruments of a grade two levels higher.

I used an MN250k blender and an A500k volume control, and the instrument produces a very natural and clean sound.

What was surprising was that when using 45~105+130 strings, the sound was close to P bass, but when I switched to 40~100+125, it changed to a sharp sound somewhere between jazz and soapbar.