448 volts on the plates 398 on the screen grids bias at -17.91 volts. I don't have an easy way to check the current as the cathodes go to ground, but I plan on soldering in some 1 ohm resistors. This is in a Lafayette LA-350. Specs call for 7189A's which are hard to find. I have a new quad of GT EL84 tubes (no M) that I bought in the mid-90s. They have a 6 rating. I don't want to kill these new tubes, so what tube can take this beating? Thanks.