....so many records to listen to then the amplifier died!
Actually not fatal, just one channel out.
Got out the meter and discovered a shorted coupling capacitor.
But, that involves ordering a replacement which will no doubt take a week.
Fortunately the amplifier design incorporates protection for the 300B triodes. When I went over to check why one channel went out, the grid in the 300B was already red hot. In an instant, the protection disabled the filament protecting the 300B.
So, it will be a quiet few days until the replacement capacitor (Jupiter if anyone is curious) arrives.