Jono43 from the UK
Hi Guys, valve (UK) or tube (USA) amps are great for kicking ass. The tubes do 'burn out' after some time and then they will have the appearance of an old dim light bulb, i.e, blackened inside the glass envelope. This is caused by the 'element' getting very hot and depositing some of itself on the glass. So do a quick visual check of a tube / valve - if it is blackened inside then it is a time to change it as it is degraded. This is how we checked out the early UK valve radios before transistors came along. Be safe and play hard!
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