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Got a bunch of tested vintage tubes from sellers with excellent feedback on that auction site...I just hope they actually DO test them and they don't fry my new Cornet. But I figured I would double-check before actually trying to use them. The one audio repair place near me in town that I called to ask to test my tubes actually sneered at me over the phone--"waste of time to test small tubes; just plug them in and see if they work". Hm. Really? Sounds pretty fishy to me, but this is my first go-round with valves, so what do I know?
Should I first try the Telefunken and Mullard 12au7s with the new "stock" 12ax7s and see if I can hear a noticeable difference? Try two 12ax7s and leave the stock Electro-Harmonix 12au7 to see what THAT does? Swap all three? It is enough to drive one batty. Which tube does what in the circuit, and what is going to have the greatest effect?