Richard

I've seen 3-500Z where the solder had melted out of the filament pins.

I have some 811 from my 30L-1 that have holes in the plates, they still work
quite well. It's been 15 years since I recall finding the holes in the
plate sides and replacing. In additon I can't recall the reason for the
holes but it had to be either
1. overdriving (which I don't think I did, 100 watt Icom)
2. high swr which I know has been over 10 to 1, but I can't see how that
could do it..
3. Light loading

But in any event for something to melt we need dissipation and only
resistance can do that!

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73
Hank WD5JFR
Still learning, un-learning and re-learning