I don't think you really need a tester. I own an Amplitrex, but, it is on loan to a friend who owns many more amps than I do, does repair work on the side for fun and can put that beast to better use. Others, above, have given great advice about swapping tubes to determine which one, if any, are at fault, and good advice on buying reserve tubes; if something sounds off, just switch in reserve tubes to see if that resolves the problem.
Tube Tester
After a lifetime of solid state equipment I have switched to tubes, my first choice in sound but had not wanted to deal with the extra upkeep in the past. What do I need in a tube tester and any recommendations for something around $150 with shipping? I am using a Unison Research Triode 25 Integrated Amp with a Black Ice Audio DSD Wifi Dac, so the tester will need to be able to test EL34. 12AU7 and 12AX7 tubes.
Thanks
Thanks