Looking for great tube integrated for Martin Logan Summit X speakers

"crackle"

smills59-

Perhaps. imperfection of the recording. Just as you may hear exaggerated "S"
in others?

I notice this occasionally in my system. I have confirmed it being the recording, by playing suspect record at a show/dealer, at it’s heard on the "$$$SYSTEM"

The best systems seem to only distract you because of everything else being so good.

I’ve heard plenty of speakers with the PL.
ML’s to me,sound amazing to me. Same goes for horns, also many of the
usual suspects talked about here. It’s really a personal preference, since the PL will mate with just about every speaker on the market.

Notice I didn’t write ALL.

If you keep the PL, fine tuning is achieved thru the inner gain tubes, power tubes and power cable. The power cable thing is yet another contentious subject which
starts wars here.

smills59...if you decide to go w/ the Sanders ESL, I am getting ready to sell a Parasound P3 pre.  It will definitely not bust your budget.

"T"  "C"  "S" are all sibilant sounds, as I said in a link  above the hard areas for an with the Summits are 5khz to 20khz (the sibilance area)  and again 3.5khz (presence area of the mids).
And the Prima Luna has a very odd high frequency boost in the top end which I believe to be output transformer oscillation which could very well exaggerate "sibilance".
https://www.stereophile.com/images/1214PLDPIfig01.jpg

Cheers George
 

Here is a review of the Summit X by Absolute Sound's Noel Keywood.  In the measured Performance section he states, " Valve amps with a 4 ohm output tap are a good choice..."
https://www.absolutesounds.com/pdf/main/press/ML_SummitX_HFW.pdf

Here is a review of the PL Dialogue HP Integrated by Stereophile's Robert Deutsch.  He states, " Ever since I reviewed PrimaLuna's ProLogue Premium, for the June 2012 issue, it has been the model I would turn to when I wanted a moderately priced integrated amplifier to try with a new speaker. It never disappointed me, and never seemed outclassed, even when the speaker was the Martin Logan Montis ($10,000/pair)."   The Montis has an impedance of .5 ohom at 20khz.  And the HP version has more output transformers that the standard Premium model. 
https://www.stereophile.com/content/primaluna-dialogue-premium-hp-integrated-amplifier

Here is the Montis impedance chart:
https://www.stereophile.com/content/martinlogan-montis-loudspeaker-measurements

Listening to the amp with my Summit X speakers, it is indeed very nice.  

The only problem you say your getting, is with "T" "C" "S" sounds

I have a friends with Summits, both series 1 and 2 "X" None of them experience any sibilance at all, in fact they are all very transparent and delicate in the highs, as are my own Monolith III’s with the newer Neolith panels. If I ever had to get rid of the huge Monoliths, the Summit’s are what I would get instead. the speaker is innocent, look at what driving them.

Here is what John Atkinson said about the strange HF peak which starts it's rise at 8khz in the measurements.
" Note the peak between 30 and 50kHz in fig.1. This peak was at its highest from both taps into 8 ohms and higher impedances, but disappeared when the load impedance was well below the nominal transformer-tap value. But with the tap matched to the load, this peak was associated with a significant amount of overshoot on a 1kHz squarewave (fig.2), though a 10kHz squarewave revealed that the consequent ringing was critically damped (fig.3), the amplifier maintaining its stability."

Cheers George