Hello to all, Finally got the Alpha 374A in the shack and slowly becoming accustomed to it's use. Noticed today that when I increase exciter drive, the amplifiers red TX lights begin to flicker at around 500w output. When i lower exciter power the lights stop flickering @ 400-450w yet the flickering returns as power is increased again. It was in CW mode running 1.6KV HV @ idle and dropping to about 1500-1550KV when transmitting. Plate current was around 200ma and grid was around 25ma, both well within specs. I was wondering if it was starving for input current but I do not notice the HV moving while the lights flicker. Any suggestions or known issues?