Piezo: Glad to see that you're efforts paid off. Elbow grease can go a lot further than money if properly applied. With that in mind though, i would check the bias on your tubes again in a short period of time. It is not abnormal for circuits that were adjusted after being out of adjustment for a long time to need follow-up work. A small amount of tweaking after further settling takes place in a day or two ( if you use your system every day ) should set things straight until something else comes up. As you mentioned, if one tube was way out of whack from the others, that one may be getting ready to let loose. If it has drifted off quite a bit when you re-check the others, you might want to replace it before something bad and costly happens. Sean
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