For external anode tubes, I use aircraft grade red silicone baffle material. It
comes in 9 foot rolls x 3 inches wide and is 1/8 in thick. It can handle up to
550 degrees F. Current price is $32.95 per roll from suppliers like Wag Aero,
Chief Aircraft, etc. Sometimes you can buy it by the foot at a local aircraft
repair station.
It works great for my 8877 amps. I don't glue it but make a tight friction
fit over the anode and staple it together and cover the staples with high
temperature tape.
73, Dennis W0JX/8
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