The Audio Voice Newsletter Sign up « BackShare triode valves tube preamplifier tube preamp Pete Millett constant-current source EL34 Show more (7) Show less by Pete Millett on Project Articles Article « BackShare related items Borbely RIAA Preamp With Tubes - A Project Remembered and Revisited Read more... A Single-Ended “E-Linear” Power Amplifier Read more... A Double-Ended Two-Channel Amp Read more... High Power SE 6C33C Amp Read more...