MX40 RADIOFOTOS GRAMMONT YEARS 1930 TUBE TESTED U61 À LA CHAULME

MX40 RADIOFOTOS GRAMMONT  MX40 = RE074D = DG407/0 YEARS 1930 In perfect working condition Tested Good on U61B laboratory tester for: shorts grid emission Leakage gas mutual conductance Results tube: Ia 2,6 mA Gm 0,6 mA/V no shorts; no gas;  no noise if shaken (100% = Ia 2,4 mA and Gm 0,8 mA/V for Vg1 = -1,5V; Vg2 = 16V; Va = 16V; Vf = 4V) tube GOOD What you see in the picture will be what you receive. Please look at all pictures as they are part of the description. Contact me if you have any question regarding this item. Payment by Paypal