Pass Labs INT 60 VS. Primaluna Dialogue Premium HP VS. Arcam A49

http://http//www.stereophile.com/content/arcam-fmj-p49-power-amplifier#xOPVkVORGFOUHhdF.97

I agree with unsound, tls49 and almarg. You might want to check out this review of the Arcam P49, which is the power amp portion of your A49. JA compares it to the Pass XA60.5

That might help you get a handle on the sonic differences of Arcam and Pass.

Cheers,

Scott

The Pass Labs is a beast and should pair very well with your Sashas and this from a tube lover. 

Kenepeters,
On paper I’d agree with those who strongly suggest a SS amplifier given the load characteristics of the Sasha. However there’s usually more to the story. Some speakers are designed with the expectation that they’ll be driven by a transistor amplifier.

Will you be able to hear either amplifier prior to buying? Listening to an amplifier paired with the speaker of choice will answer all questions. The P.L. Premium HP is noted for high level built quality and excellent transformers. As some others have posted here I also find tube power amplifiers "generally" sound more musical, natural and realistic (with a suitable speaker match). My gut leans towards the Primaluna (Particularly with the KT 150 tubes). Without an audition the Sasha’s specifications suggest the Pass Labs amp the safer bet. Anecdotally I've heard the larger Wilson speakers with tube amplifiers and the sound was very good. 
Charles

Kenepeters,
Earlier this year someone named orionpcgames who owns Sasha speakers had a similar thread. His dilemma was Pass Labs 250s or Cary 211c push pull tube amplifier. He ultimately chose the Carys and he was "ecstatic "(his word of description )) with the results. He was suitably cautioned about this choice but did so anyway.

He may have been as happy with the Pass Labs if he’d went that route (who knows?). Just an example of listening results that are contrary to well reasoned caution based on known specifications.
Good luck,
Charles

As almarg mentioned, the high output impedance of some tube amps is what would concern me. 

One one of my biggest audio disappointments was getting a 60 watt tube integrated that I came to find out had on unusually high output impedance. My speakers had 12" woofers and a low impedance of 3.2ohms. The amp could not do anything with that woofer. I had nothing but mids and highs and very weak lower mids and bass.

Now, I had a sixteen watt SET 845 tube amp from Art Audio that ran those same speakers beautifully; some of the best sound I have had. To this day I can't get the sound of that amp out of my head. It was fantastic and I wish I still had it.

I guess the takeaway from this would be try before you buy if you can. It could be fantastic or it could break your heart.

Cheers,

Scott