These selected sets by TAD are indeed lovely tubes , I bought a matched set of 4 and on each set TAD specify a Plate Current number (PC) which varies between 26 and 35 (I believe) I messaged Thomann to ask if they maybe had a set reading around 27 as I had some other tubes with a PC of 27 and it would save me re-biasing my amp .
These tubes are really good replacements for any amp that can run on EL34s. The ENGL Invader head of a friend was in desperate need for a new set of tubes. We installed these TADs in and the amp runs cooler (temp-wise) but the tone is rounder and the OD channels sound smoother with less sizzling, paper-shredding-like treble without replacing the preamp tubes! That's a big bonus!
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