AntennaWorks 8877 User Manual - page 16
16
Chapter 13. Tune and Operation Procedure
Keep it legal.
Your drive level is up to you. The amplifier is able to exceed output levels
regulated by the FCC. We build a product that is able to exceed legal limit
so it will work well at legal duty cycles. If you exceed these levels,
premature tube wear will occur, so keep it within a drive of 75 watts or less
so it will last a long, long time.
Remember the amplifier is set up at the shop here, so only tuning of the front
tune knob should be necessary. If you adjust the plate loading in the back,
loosen the plate loading screw, make a small adjustment and then re-tune the
front for max power out, while watching the grid current. A closer spacing
will lower the grid current. You want high power and reasonable grid
current. Never exceed 80 milliamp grid current.