Can using a bad tube hurt an amplifier?


If you're using a tube for a while, and everything's fine, and then voltage changes over time gradually, and then it damages an amplifier? are amps Built with controls to prevent that from happening?

How can you trust using a tube if it potentially could harm an amplifier?

Assuming You're using the correct tube in the slot provided.

 

emergingsoul

Just had Fedex drop off the replacement Gold Lion 300b, inserted it in the amp, and voila, music is playing again. 

Just one $5 220uf Rubycon capacitor was all that needed replacing. 

Lucky the cap went first, and not after various other parts as in this component:

https://www.youtube.com/watch?v=ZaEiO_9qMwY

 

My 1948 Capehart has a main power supply in which the xmfr winding for the rectifier tubes is fused to prevent catastrophe.