Once they break in they have a very musically NEUTRAL sound. That term has been wildly overused in out hobby, but the PFF-100s are as neutral tube amps as you going to get. However, the texture of the harmonics is very "proper". They are different from the VTL MB 185 Mk3, and Jadis 120. IMHO of course. Jadis is very charming.
Interesting. Thank you!

Do you have any experience with Thomas Mayer's Elrog 845s in them?
 
Also, very important to check for the possible bias drift after a week after first turn on, and then in another couple of weeks, and then every couple of months thereafter.
Will do!
 
Interesting. Thank you!

Do you have any experience with Thomas Mayer's Elrog 845s in them?
No, by the time when Meyer bought that production line from Elrog, I had no longer had the PFF 100 in my system. I ve heard the Psvane upgraded tubes from Grant fidelity in the PFF 100 and those sounded very, very good. That was about 12 years ago or so, so cant comment on the present state of those premium 845. Having said that I have to say that the Shuguangs that came with these from factory have proven themselves to be exteremely reliable, as my dealer has been using the same quads in both units for the last 15 years or so, and not just for an hour a day. Nary a failure. However the bias check is a key.
 
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Out of the box impressions:

-- bright, thin, brittle, edgy (think bad, early solid-state) (tubes and capacitors are new)

-- noticeably more resolving than JA100s

On Jadis I don't think I ever heard the echo or decay (or whatever that is) on the very first drum hits (or whatever they are) at the very, very beginning of Lyle Lovett's "North Dakota." Now that echo is very obvious! And I have played that song many dozens of times.

I am very accustomed to the Jadis gauziness. This sounds more "professional."
Give them time, Ron. Counterintuitively, everything you explained as your out of the box experience is a sign of very good tube gear. Unfortunately, it takes time for top notch tube gear to lose that initial “zing” but the sound when they settle will more than make up for it.
 
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