Members ksl Posted June 16, 2021 Members Share Posted June 16, 2021 hi all~ I get it, & you can't simply swap them around w/o some knowledgeable surrounding value changes, but I have an modded Bell & Howell amp the uses 2x6V6, a 6SC7, a 6J7, & a 5Z4 that you could cook a steak on, & the tranny seems to get real toasty as well, & I was thinking of the potato masher 5R4 WGA/WGB rectos, especially due to their over-built-ness,,,, I know that 5U4's are not so easily swapoed due to some electronic config or another, BUT sound & gainwise, what changes could I expect using that particular 5R4 or any other trusty JAN tube or a 5AR4, or whatever,, For whatever it's worth, I'd like to nudge just a touch more gain out of the amp, and temper all that excess heat.. Thoughts & experiences! thnx in advance!! Quote Link to comment Share on other sites More sharing options...
Moderators daddymack Posted June 16, 2021 Moderators Share Posted June 16, 2021 looking at my GE tube sheets ...no direct substitute for a 5Z4 listed...try a search for '5z4 tube equivalent' Quote Link to comment Share on other sites More sharing options...
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