For guitar and musician's hobbyist efforts when you're ready to move up to the higher voltages of vacuum tubes there's AX84: http://www.ax84.com http://www.ax8

For guitar and musician's hobbyist efforts when you're ready to move up to the higher voltages of vacuum tubes there's AX84: http://www.ax84.com http://www.ax84.com Read their high voltage warning. Remember at one time almost everything was high voltage compared to today.