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Rolling KT150s in Primaluna hp integrated

I’m a mere five hours into these.  This is an alive and kicking tube.  It’s like it had a double espresso before the music starts.  I’m hearing big and strong delivery, but that’s so overwhelming that I cannot focus on midrange.  It’s clear I need some time with these. 
jbhiller
georgehifi's avatar
georgehifi
4,966 posts
 
1graber2111 posts03-10-2018 5:44am@georgehifi as you said, the bias can change the heat.

Ah no, I said the main source of heat from tube amps is from the heaters/filament it's circuit/transformer, the bias whatever it is, contributes a small amount compared to that.
Cheers George
georgesallit325's avatar
georgesallit325
8 posts
 
Guys, FYI, Christiaan Punter did a review of fitting KT150s to a PrimaLuna and then compared it to other amplifiers including the ARC Ref 75SE.  Interesting outcome.

http://www.hifi-advice.com/blog/review/analog-reviews/amplifier-reviews/primaluna-dialogue-premium-t...
georgehifi's avatar
georgehifi
4,966 posts
 

They used the Wilson Watt/Puppy 8"s for this review.
This statement by the reviewer is wishful thinking.
" Although neither the Wilsons nor the Franco Serblin Accordo’s are particularly power-hungry"

Stereophile test on the WP8’s:
"However, and also like its predecessors, the WATT/Puppy 8’s impedance characteristic demands the use of an amplifier that can deliver generous amounts of current. There is a drop to 2.2 ohms at 77Hz where the most power is needed. (fig.1)"
https://www.stereophile.com/images/archivesart/607WILFIG01.jpg

Combine that 2.2ohm with the -phase angle, and it could go down even below 2ohms. And with the PL’s you’ve only got 2 tubes to drive each speaker.

Cheers George
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