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Primaluna Prologue One power tube rolling

I've tried some EH 6CA7s as well as the stock tubes and JJs. I was curious about trying KT77s since they're another EL34 variant ... and then I got to thinking, what about KT88s.

It has adaptive auto bias so I figured it should work just like the Prologue two, correct? I konw the extra cost of the 2 buys you the upgraded caps, diodes, and KT88s ... but does that mean you CAN'T use KT88s with the 1??
gnugear

Showing 2 responses by nsgarch

nsgarch's avatar
nsgarch
2,524 posts
 
Always check w/ the manufacturer first! There may be other issues that are not obvious.
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nsgarch's avatar
nsgarch
2,524 posts
 
I was going to suggest you try Telefunken 12AX7's but the Amperex are very similar (BTW, you don't HAVE to buy "Bugle Boys". All the Amperex/Holland tubes are the same, and they made them for a multitude of other brands/manufacturers: Hewlett Packard, Eico, Fisher, Electrohome, even Mullard -- if you look on Ebay, you'll see what I mean)

If you really want a big (and pleasant) surprise get some NOS (ca. 1958) RCA longplate, blackplates. The best 12AX7 I've heard, and maybe the best 12AX7 ever made (see discussions on AA.)
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