Primaluna Prologue 2 Upgrades

Not parts, but I rolled tubes and the improvements were fantastic. I used all NOS made in UK around 50's Mullards / Brimars in pre and driver sections plus UK made NOS GEC KT88.
The tonality of amp become miles ahead from stock tubes, its like day and night, thats all I can say.

Replace the original KT-88 power tubes with KT-120's if you do nothing else. You will get significant improvement in bass and detail. Prima Luna OK'd the 120's use in all their amps at the beginning of 2013

I preferred the EL34 in the PL2 and in fact ran a combo of winged c's and new sensor mullards.

I too rolled the input tubes to Mullard for the AX7's & some French 1956 military's from La Radiotechnique for the AU7's, as suggested by Kevin Deal . The AU7's were not as important as the AX7's .
These made a huge difference in the warmth and tonality of the sound . They did not affect the great top end extension but did increase the base a bit . It also responded favorably to the EL-34's by Electro Harmonic's . The people at Upscale Audio stated that a power chord upgrade did not do much and therefore did not recommend it .

These changes increased the warmth/tonality , which is what I wanted to do . I felt that the stock tubes tended to make it sound like a SS unit . To me it is better but not generally what someone is looking for when trying to upgrade parts . For that type of better I would just change amps all together . You did not state what type of change it is that you are looking for with the upgrade .

Good Luck

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.