One - Excellent ZENITH 6T8 6T8A Tube. Diodes : 49,47,48 The Hickok Minimum for a 6T8 Triode/Diode/Diode/Diode is 30/40/40/40. Fully Tested on Triode and All Three Diodes. Triode : 45. GE Mfg. ZENITH Lettering & Tube Box.
