08-17-2008, 03:27 AM
The price of #45 tubes are outrageous! In several cases, I have "subbed" #47s tubes in place of the 45s by making socket changes from 4-pin types to 5 pin types, and rewiring sockets accordingly. Both tubes are close electronically speaking if you check the tube manual. Ive never had a prob in this conversion to escape the extra-expense, and no noticable sound quality difference that I could hear.