Primaluna Prologue 2 Upgrades

EL34 NOS Tesla's were very good, but not at the level of NOS GEC KT88, so, before you do any change, I hope you have the funds to do that roll. KT88 are simply much better tubes, power and delicacy, where EL34 cant match.

I also tried NOS Tung Sols 6550 Smooth Black Plates and Sylvanias, but again, KT88 GEC's simply eats them for breakfast.

Looks like "Maxmad" acts as his screen name. GEC's are like a holy grail of tubes, probably about the same cost as the OP's amp in total... if you can find them. The Tung-sol KT-120's cost about $240 for a quad and blew away handily the Gold Lion KT-88's which I paid more for and in the past year.And while EL-34's sound sweet, I really can't live with a tube that snoozes on percussion.

A quad of new factory matched KT120s should cost around $175 unless cryoed or something...I bought my set from an Ebay store a year and a half ago and they're still working and sounding great with no audible sign of wear, bias drift, explosions, or fatigue (hell, I'm wearing out faster than these tubes)...a bargain as far as tubeage goes.

Thanks Davide256

Yes, I may sound Mad, but, this is end station in tube rolling and if the OP would like to know what to do to make it better, why not this option, even it sounds crazy. You can find them in UK, some NOS, some used, but good testing, price depends and will be around GBP100 each, maybe more. There are places where you can get them in US to, but I am not sure about the price these days, as I bought them in Europe.

There are EAT KT88 as well, but I dont know if they are worth that kind of money, never tried them, besides, EAT do not build them, probably KR does, as their 300B to.