[Amps] Ten-Tec Centurion Mod. 422 Tubes Look Biased on at Turn on

[Roy Koeppe]

Likely intermittent fil to grid short. Remove one tube at a time.  Bet 
they're Eimac.

Luck & 73,   Roy




"In standby at power on, reading the front panel meters

Plate current reads about 50 mA should be zero

Plate voltage about 2400 or 2500V should be 3100

Ig goes negative about 40 mils

Four five minutes amp is trying for space heater status - plates get red
and exhaust is hot."