EL34 tubes- alternates to matched octet for Primaluna HP dialogue premium

I have an HP as well and have used those NOS Mullards (the 8136 variety?) on my front end as well. Huge difference. Worth the $$ IMO and we are talking $120 per tube.

Theoretically, you can put 8 different EL34s in there and due to the PL self-biasing, it should work fine. but even Upscale Audio (kevin deal part owner of PrimaLuna) doesn't recommend this at all. I dont know the specifics, but makes sense on a  common sense level.

@newbee makes a good point about trying modern production tubes  before the greater expense of a full Octet of NOS tubes. But sometimes I want to take my upgrade climb 2 levels, not just one. The new production tubes get you 1 level. NOS gets you 2-3 levels higher. 

To save some money and intermediary steps, consider going straight to NOS if you will be using that amp for years to come. If you get the 8 modern tubes, listen for a month, then desire to go up to the next level, then you've got 8 tubes on your hands to have to sell. 

IMO< any upgrades to the PL HP integrated helps the whole system. It think of it as a great foundation/blueprint to build on with tubes specific to your system and room. 

If I had your integrated I probably would be tempted to try the kt150s just based on all the favorable reviews. They will not work in my El34 amp. I have used old stock mullards and a few new production tubes. But the best has been the Gold Lion kt77s I purchased from Upscale Audio.

There are several references to the PL integrated.  I have the power amp version, running a separate preamp.  I assume the comments apply to the power amp version as well as the integrated.

to 1graber2- yes the 8136 mullards at 120 each.  Might be the best money I have ever spent for a sonic improvement, best bang for the buck.

Get you two matched quads of Shuguang 6CA7-Z 50 Year Treasure Tubes (Black Bottle) and just kick back and enjoy the music, have had great luck buying these from a couple different venders on Ebay, just remember to get their premium grade.

Matched modern power tubes are fine.  8 matched NOS power tubes would cost way too much, and besides, you won’t really find 8 matched tubes- there aren’t enough of them to sort and match them like they can new production.  The recommendation for 8 premium matched Shuguang Treasure tubes is a viable answer to your question, but is almost absurd; too expensive to put so many in a budget amp.   
   The small signal tubes make the most difference and the cost is justifiable (to an audiophile, hah!)
   If you must, Mesa can sell you a set of matched Siemens EL 34’s.