Seems like Fender always put more than 150 mA through a 5U4 when feeding 4 - 6L6GB tubes with about 80 to 100 watts or more of audio out. Assume 65% efficiency and 500 volts on the plate supply and do the math... It's gotta be well over 150 mA.
Best regards - Bry Carling > On May 24, 2014, at 2:32 PM, Garey Barrell <[email protected]> wrote: > > Bob - > > Depends upon how much DC current is drawn. Roughly speaking, the 5U4GB is > about 150 mA of DC current supply, and the 5Y3GT is only about half that. > All sorts of limitations/variations on both depending upon cap or choke input > filter, DC voltage, etc..... > > Tube data book covers all that stuff. Bases are the same. 5Y3 draws LESS > filament current, so no problem there. > > But as long as the DC current drawn is less that about 80 mA you can safely > sub a 5Y3 for a 5U4, at least long enough for test. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line > and TR-4/C Service Supplement CDs > <www.k4oah.com> > > Bob Jackson wrote: >> Can a 5Y3 be subbed for a 5U4 for testing purposes? >> >> Bob > > _______________________________________________ > Boatanchors mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/boatanchors _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors
