Testing an El84 Vacuum Tube with 9v Batteries

I have always been interested in vacuum tube amplifiers, however the high voltages from the mains has always kept me from experimenting with them. About a year ago I played with an low power tube the 1t4 in a regenerative receiver. The B+ was set to 45V powered from an array of 9v batteries. I … Continue reading “Testing an El84 Vacuum Tube with 9v Batteries”