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RE: Ahhhh, you want the magic of tube hype

You need to buy a better (much bigger) 1:1 interstage. Your measurements only show that the transformer you used in the past was not designed to allow the swing you need.
Lundahl says max is 145Vrms @30Hz for the ll1677 and i know this is a correct value. At low frequencies the interstage has more limitations then at 1kHz. Lundahl at 20Hz will be even worse then 145Vrms.




Edits: 12/25/23

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