as mentioned. audio output tubes get HOT!
2 alike tubes.
https://frank.pocnet.net/sheets/049/6/6AQ5A.pdf 10w max gets up to 250c!
http://www.nj7p.org/Tubes/PDFs/Frank/127/6GK6.pdf 17w max no heat listed, but you can bet it also gets over 200c.
this is normal
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