As Frogman stated earlier, and I'm paraphrasing, the tube compliment you find most pleasing will be according to your own tastes, preferences and components/set-up. I've tried a few,( no where near most of you) and the Sylvania black plate, steel pin, 5751s were a let down in multiple configurations. While I'm not yet finished listening to different tubes, my current favorite set-up is V1 Telefunken smooth plate, V2 Mullard CV 4004, V3 60's Seimens. That's just me.
Mine has no internal mods. Replaced the stock RCAs with chassis mount WBT knock-offs. IMO, aftermarket power cord and isolation makes a substantial difference for the better.
Mine has no internal mods. Replaced the stock RCAs with chassis mount WBT knock-offs. IMO, aftermarket power cord and isolation makes a substantial difference for the better.