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Let’s now hear from van Willenswaard directly about his PW1 design philosophy. “For starters, I decided not to use bipolar transistors in the first part of the signal chain — in my experience, [they’re] too crude for very low-level signals,” he noted. “Subsequently, I made a choice for two parallel routes — opamps and fets. And in each case, I tried to avoid over-asking [and] over-stressing the active components. And I paid a lot of attention to the power supplies. After more than 100 hours of study, measurements, prototyping, and listenings tests, we decided to drop the opamp itinerary. Despite all the effort, it didn’t hold up to the 3-fets-per-channel approach that slowly had crystallized in a parallel universe. The latter was simply more seductive, more natural, and so musically involving.”
Some will notice the relatively high harmonic distortion figure of the PW1 compared to some competitors: < 0.55% (or < -45dB). This is a result of the choice for simple FET amplification stages and because nothing is ‘corrected’ with feedback.
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Finally, the SRP for the Grimm Audio PW1 phono preamp is $4,900.
Some will notice the relatively high harmonic distortion figure of the PW1 compared to some competitors: < 0.55% (or < -45dB). This is a result of the choice for simple FET amplification stages and because nothing is ‘corrected’ with feedback.
Grimm Audio PW1 Phono Preamp
The Wizard has spoken — or rather, Grimm Audio co-founder Peter van Willenswaard has stepped forth to unveil his latest design triumph, the PW1 phono preamp.
Finally, the SRP for the Grimm Audio PW1 phono preamp is $4,900.
