|
evolve already
I suggest you get out of your dream world and use a 21FBP22 Rare earth in those relics. 315C is not a critical temperture where tube faceplates fracture during processing.
Usually tubes that fail during the up "ramp" cycle have been exposed to rough handling in the past.
6 hours for a bakeout is too long, unless he is using a 350C peak temp for the metal tubes.
4 hour bakeouts with a peak of 385c for 15 minutes is good.
Tubes don't like it when they are in the oven, and you have a garage door open, even a small gust of wind will make them pop.
|