Going to start a thread to track my tube rolling on my Torii Jr. I am limiting my permutations just to stay sane in the process.

The objective is to stay below $50 / tube if possible.

Input Tubes: 6N1P / 6N5P / 6N23P
Power Tubes: EL34 / KT66
Regulation: 0A3
Rectification: 5U4 / 5AR4 (GZ34)

# Input Tubes

• Reflector 6N23P-EV - $30
• Voshod 6N1P-EV Gold Grid - $22
• (Steve) 6N5P - $16

# Power Tubes

• Gold Lion KT66 (New Production) - $40
• Tung-Sol KT66 (New Production) - $35
• Tung-Sol EL34 (New Production) - $25
• Mullard EL34 (New Production) - $25

# Rectifier

• Mullard GZ34 (New Production) - $35
• Gold Lion GZ34 (New Production) - $40
• Winged =C= SED 5U4-G / 5U3C (NOS) - $50
• 5U4G blackplate RCA, ST shape (NOS) - $59

Well, if you run across a Sophia Electric Aqua 274B (I know it's out of your stated price range) don't hesitate to try it--it's similar to a 5U4 and it sounds sublime in all the components I've tried it in (CSP2+, CSP3-25, SE84UFO3-25 Monoblocks, Torii Mk II, Torii Mk III, Taboo Mk III, Taboo Mk IV).

And it's worth stepping out of the 5U4 field (and I think Steve would agree as he uses these in many amps) to try a Type 80 rectifier with adaptor, especially the globe type. Very interesting rectification that sounds wonderful in the components I list above.

How did the mullard el34 and gold lion kt77 compare to the Tung sol el34? I have the Tung sol’s in mine now and was considering the mullards or switching to kt77 with the gold lions. Any impressions would be appreciated!