Cayin, great sound, great value. Keep in mind that Primalune and Cayin are essentially the same unit.
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Autobias is really nice, but best sound is better. Not saying the Cayin's don't sound better, but just priority. I notice that some of the very expensive tube amps, let's say CAT JL2/3s don't use autobias, and if I know Ken, it has something to do with best performance - but I do appreciate the feeling of knowing the bias is being managed, on the other hand, setting bias manually and seeing it stay there has its own satisfactions.
I have the Cayin and am very impresed in the sound for the price. Clean and clear, resolving, holographic image, emotial impact, natural - albeit it not eternal but natural decay and great soundstage and placement of instruments). I guess I should check bias soon but over a year (PC system so light use) it still sounds spot on. Anyone know of probes that fit the Cayin A50T? I have stock probes on my Simpson VOM and they are too short (standard length-the Cayin needs something different). I have beem twisting silver paper clips around the probes to get the extension but willing to pay some bucks to get something that I don't need to jerryrig.
@Buconero117: The current Cayin amplifiers have nothing in common with PrimaLuna, other than both being built in China. PrimaLunas have different chassis designs, different circuits, different transformers, different parts, different quality control oversight. While early Cayin amps shared a similar chassis with PrimaLuna, Cayin no longer makes those amps.
@Pubul57: The Adaptive AutoBias circuit in PrimaLuna amps is an extremely sophistocated circuit that constantly monitors and adjusts bias according to operating variables inside the amp. It's not just a simple cathode-bias circuit found in the majority of "auto-biasing" tube amps, which can hinder sound quality.
Bias fluctuates during listening, depending on a number of variables. These flucuations can negatively impact sound quality as the bias drifts away from the optimal setting for the amp. Adaptive AutoBias monitors these changes and adjusts each individual tube according to its needs, ensuring all 4 tubes are always operating at peak efficiency.
A reviewer in England compared two identical PrimaLuna amps, one with Adaptive AutoBias, the other with manual bias, and noticed the unit with Adaptive AutoBias had dramatically better sound quality.
Bit out of topic, but...
I own PrimaLuna Prologue Two and that's a very good amp, especially when you tune the sound with valves to your liking, which are endless to choose from. I would go for Two instead of One, cos, jumping from EL34 to KT88 is not the same as from KT88 to EL34, however I will know this for sure when my EL34 arrives.
At the moment I wait for some NOS EL34 Telsa's, not JJ, but the real one from 1970-80's, and I expect some nice changes from already brilliant NOS GEC KT88.
I run it with Sonus Faber monitors, great match, but my surround Canton CD100 speakers become a huge surprise as well, just don't believe they sound that good.