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Biggest noval dual triode?

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6463 : Pav = 4,4 Watt ( 7,7 Watt max. in all)
 

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For a cathode follower I would look at the 7044 or the E182CC/7119. They both have high cathode current ratings, and even higher peak current ratings. 4.5 watts plate dissipation per triode, 8 watts total. Both are very linear despite their original use as "computer tubes". The 7044 was used by Audio Note in their Ankoru design, and the 7119 has been diy'ed many times. I have used both succesfully. Beware the non standard pinout!
 
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