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quantum · 15th Sep 2006, 11:17 am

I also think that EL34s would be the most efficient for this purpose. In the May '64 issue of PW there is a circuit for a guitar amp using 807s which delivers 35W, but for that the mains transformer employer is a beast delivering 450-0-450 v at 250ma! Still, a 5U4 does the business as a rectifier.

15th Sep 2006, 11:17 am	#5
quantum Retired Dormant Member Join Date: Mar 2003 Location: Birmingham, West Midlands, UK. Posts: 785	Re: output valve choice I also think that EL34s would be the most efficient for this purpose. In the May '64 issue of PW there is a circuit for a guitar amp using 807s which delivers 35W, but for that the mains transformer employer is a beast delivering 450-0-450 v at 250ma! Still, a 5U4 does the business as a rectifier.