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Questions about tubes and gear that glows. FAQ

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Re: Newbee ST-70 questions

Posted by Steve O on January 28, 2004 at 16:34:59:
You queried: "...but I'm wondering: can I damage the amp by running it in the meantime?"
The answer is yes and no. Red plate output tubes are an indication that something is seriously wrong. Although there are numerous causes, some already discussed, the net result is that the glowing tube(s) is drawing far too much current. This condition may very quickly damage the glowing tube and may also damage the rectifier, OPT and PT if allowed to continue.
If you feel compelled to operate the amp w/o determining and fixing the cause, as long as there are no glowing tubes or popped fuses you're probably OK doing this. You must literally keep an eye on the amp when powered up so that you can shut it down if the problem occurs again. Do not do an unattended warm-up.
If this were my amp (even considering that it's just an ST70), I would wait and get the new parts and be sure that it's fixed before anything other than diagnostic operation.