Peter W. wrote:[quote="deepee99" >>Massive Snippage<<
Again, I assUme that high heat is Not A Good Thing. Tube amps reputedly can tolerate a dead short but I'm not gonna try it. Do that with a sand amp and kiss your house good-bye.
Heat is never a good thing outside of a cooking appliance, heating appliance or fireplace. And uncontrolled/unanticipated heat can do a great dea of harm in a rather short time. Further, even a bit of extra heat will contribute to early failure of many things.
I also keep a small 'heat gun', it is one of my work tools, and I have had it for almost 20 years now. Even then, it was less than $20 to purchase, and today is probably half of that. Other than checking discharge temperatures at HVAC diffusers, one of its best uses is detecting *differences* in temperature from one part to another. Keep in mind that if one has no effective basis on which to judge what is the proper temperature, a difference between two otherwise identical parts or locations may be significant.
So, what is the correct operating temperature of an OPT on the typical ST70?
Betcha it is going to be a range![/quote]
Peter W, massive snippage of my garrulous posts is frequently salutary. I used to have editors who did that for me, but newspapers have died.
While I cannot give you specifics on the heat generated by the OPTs on the ST70,my experience with tube gear is that it takes several hours to settle into what tug-boaters used to call the "company notch" -- that ideal balance between power and fuel efficiency. You can hear it when it gets there. I regard any measurements taken before she hits that notch as irrelevant. The exceptions of course are when you're checking out a new build or new tube/rectifier installation to expose any obvious wiring or equipment flukes (pun intended). Otherwise, I wouldn't take any measurements seriously until the critter's been on for a couple of hours.