Primaluna Prologue 2 Upgrades

Thanks for the replies.

I have gone through the tube changes, have Mullard NOS input/driver tubes and Svetlana EL34 output tubes. As you say Saki70, it does make a difference to the performance character of the amp, much more preferable to my ears.

I was really asking if anyone had done any major component changes such as cap and resistor changes to, probably, better specified/quality components.

The Prologue 2 is such a great amp once the tubes are changed to other ones, I was wondering if anyone had taken it any further, or whether it is possible to improve the performance.

I recently put a pair of Psvane 12AX7 T IIs in a Jolida and they sound great...clear highs and tight bass, with an overall clean presentation without tubey artifice. There was nothing wrong with the Tubestore "Preferred" 7025s I had been using but was interested in a roll for my own amusement, and I am sold on these tubes. Note: get these from the Canadians as I had some issues with the Chinese Ebay dealers...resolved but took a while.

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.