And the PrimaLuna DiaLogue Premium Integrated Amplifier is the first from the PrimaLuna family which has our 100% approval to use the new KT120 power tubes. We have users in the field reporting about favorable results with these tubes in other PrimaLuna models, but we did not actually prepare any of these models for this tube. The power section for the PrimaLuna DiaLogue Premium Integrated Amplifier has been prepared for KT120. The amplifier bias switch position for KT88 and KT120 is the same.
Since many years we are using again a Russian tube in our PrimaLuna products. We used Sovtek 5AR4 in the beginning for our ProLogue Three preamplifier and ProLogue Eight cd player and Electro Harmonix AU12AX7 in these same PrimaLuna models. As these Russian tubes were too “fragile” we switched to Chinese tubes and found these to be more reliable in the long term.
I see some noses moving if I write Chinese tubes. We have however a special arrangement with the manufacturer as we are buying so many of their tubes. We call this the PTS – Premium Tube Selection:
After we receive the tubes from the manufacturer (who quality-controlled them to be within his specs), these tubes are re-selected by us following our simple 60 out of 100 rule (PTS™ – Premium Tube Selection).The best 60 pieces get the PrimaLuna label, the rest goes back to the manufacturer and are sold elsewhere. These 40 are good, but not the best. While matched tubes are not a requirement, it is still recommended if you want to get the very best results.
If you want to go N.O.S. (which we cannot due to the limited availability), several other parties offer these, if you wish to upgrade.
KT120 tubes are bought by us as matched Quads and after we receive the tubes we re-test them to be sure nothing went wrong in transport or during the matching process. If specs are met, a PrimaLuna label is added.