You could use 6J6 as V1 if you adjust the CCS for a suitable operating point. You will have to find tubes with well matched halves since you cannot balance with the pot anymore.
6GU7 can be used almost straight in, maybe a small tweak to keep 260V plate at 120V grid.
If I were you I would use 6GU7 in both positions. 6J6 isn't the most linear tube I've seen.
Either way, you need to tweak the phase compensation net a little.
Another idea is to use two 6J6 as V1 with the halves paralleled.
6GU7 can be used almost straight in, maybe a small tweak to keep 260V plate at 120V grid.
If I were you I would use 6GU7 in both positions. 6J6 isn't the most linear tube I've seen.
Either way, you need to tweak the phase compensation net a little.
Another idea is to use two 6J6 as V1 with the halves paralleled.
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