I have a purifi amp and it couldn’t hold a candle to the original 300b statement prototype. I love new class D as when you get the synergy right I find it to top any SS class AB I’ve heard. But the 300b just makes everything right. I find it odd because it does even the technical attributes better. The blackground is soooooo black, the details precisely rendered, and the soundstage depth of the charts. The only system I’ve heard that could compete was a magico paired with ClassE mono blocks. But even that system while the soundstage was mind melting it was very polished sounding. The 300b statement has much more realistic tone with great texture.
I still snicker 🤭 when bringing a friend over who’s never been a big fan of tubes and putting on Pot by Tool cranking it to 11 and watching his mouth drop. The sheer power and realism the 300b’s presented!
300b lovers
I have been an owner of Don Sachs gear since he began, and he modified all my HK Citation gear before he came out with his own creations. I bought a Willsenton 300b integrated amp and was smitten with the sound of it, inexpensive as it is. Don told me that he was designing a 300b amp with the legendary Lynn Olson and lo and behold, I got one of his early pair of pre-production mono-blocks recently, driving Spatial Audio M5 Triode Masters.
Now with a week on the amp, I am eager to say that these 300b amps are simply sensational, creating a sound that brings the musicians right into my listening room with a palpable presence. They create the most open vidid presentation to the music -- they are neither warm nor cool, just uncannily true to the source of the music. They replace his excellent Kootai KT88 which I was dubious about being bettered by anything, but these amps are just outstanding. Don is nearing production of a successor to his highly regard DS2 preamp, which also will have a unique circuitry to mate with his 300b monos via XLR connections. Don explained the sonic benefits of this design and it went over my head, but clearly these designs are well though out.. my ears confirm it.
I have been an audiophile for nearly 50 years having had a boatload of electronics during that time, but I personally have never heard such a realistic presentation to my music as I am hearing with these 300b monos in my system. 300b tubes lend themselves to realistic music reproduction as my Willsenton 300b integrated amps informed me, but Don's 300b amps are in a entirely different realm. Of course, 300b amps favor efficient speakers so carefully component matching is paramount.
Don is working out a business arrangement to have his electronics built by an American audio firm so they will soon be more widely available to the public. Don will be attending the Seattle Audio Show in June in the Spatial Audio room where the speakers will be driven by his 300b monos and his preamp, with digital conversion with the outstanding Lampizator Pacific tube DAC. I will be there to hear what I expect to be an outstanding sonic presentation.
To allay any questions about the cost of Don's 300b mono, I do not have an answer.
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I’m not sure how the 300b statements could achieve such great technical performance over some of the “state of the art” amplifiers I’ve had in. Maybe Lynn, Don or Ralph could comment on that. It’s put things into perspective that maybe just maybe we don’t know every way to quantify all measurements to what we hear. |
@donsachs That was true back in the 1980s. It really isn't now. Measurement technology has really advanced in the last 40 years! Its the distortion of any amplifier that is its 'sonic signature'. There are many class D amps I've heard over the years that I had to struggle to take seriously. But I've heard some now that sound every bit like a very good tube amp; just like in a tube amp where arcane subtleties can make or break a design, the same is true in class D (or any design for that matter). I pointed to what is needed to make a successful amplifier (if you're going to use feedback) in my prior post. Most amps using feedback fall short of the GBP needed so distortion is much higher at higher frequencies than the THD measurement suggests! THD by itself, if that is the only harmonic distortion metric used, allows a lot of problems to be swept under the carpet. When it is the sole metric, it leads to the myth that 'there are things we cannot measure.' The reality is if the harmonic spectra is measured at several frequencies (including above 1KHz) and if distortion is graphed vs frequency, then we start to be able to predict the 'sound' of the amplifier. Both the 'measurement only' guys and the subjectivist guys hate this! But Daniel von Recklinghausen was right- if it measures well but sounds bad, you measured the wrong thing.
@cloudsessions1 That is because in most amps employing feedback, its poorly applied- so my surmise is you've yet to hear one where the feedback was really right. Norman Crowhurst pointed this problem out 65 years ago, describing how the feedback node (the point in the amplifier where the feedback signal is mixed with the incoming signal) isn't linear; therefore the feedback signal gets distorted before it can do its job, thus creating higher ordered harmonics that have given feedback a bad rap. Its not the fault of feedback so much as poor application. Amazingly, little has been done in the last 6 decades to fix this; IMO mostly out of ignorance and a lack of will to do so. I've heard amps with very high feedback that sound utterly relaxed in the mids and highs and portray depth with ease. |
These amps are still prototypes and being tuned as we speak. So what Cloud wrote was in reference to the first prototype a year ago. Spatial Audio Lab had that amp for maybe 6 months. The mono amps are probably 25-30% better at least. @whitestix has a pair, and Lynn and I are still tuning them and have improved them since that pair went out. What will be shown at the Pacific Audio Fest in Seattle will be very close to the final circuit, but there will probably still be a bit of tweaking after that. I would expect production and sales to be Q4 of this year and maybe Q1 of next. We have to see how it goes. Again, I hope lots of people can hear them in Seattle and give an honest opinion. They will come to market, I promise, but we want them to sound as good as they can first. |
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