One time back in the 60s or the 70s I was running a Heath D X 100.  I had it 
slid part way out of the cabinet doing something to it when I heard a pile 
up on CR9AH over in Macaw by China.  I had heard folks working him many 
times but could not hear him but after tuning around and finding him he was 
very loud. I slammed the T X back in the cabinet and had raised it up a 
little and broke the V F O [6au6] tube off.  I could have laid down and 
cried.  I pulled it back out and luckily had marked spare tubes with masking 
tape.  I put a new one in and carefully slid it back together.  Hooking all 
the cables up I could still hear the station so called and worked him. 
Afterwards  I could feel the front of my shirt which was wet with sweat 
going in and out with the beat of my heart.  Sorry for the long story but it 
was one more  highlight of my D X chasing days.
Ed K7UC