I have been enjoying the Firebottle KT88 with 6v6 tubes. I have gone back to my old standby of the tall bottle 7n7. I had been running it with an RCA 5u4g but the other night I noticed a dull orange glow on the plates. Yikes! I have since started using a 5Y3 rectifier and that has taken care of the glowing plates. I haven't noticed a difference in the sound either. Listening in the dark is also a good diagnostic for amp operation!
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