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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: 6550/KT88. Your 539C is not going to be able to put 85 watts on the plate (nt) posted by 6bq5 on November 18, 2024 at 20:27:49:
Just an excerpt from my FAQ here on the Tubes Asylum:
Most tube testers do not test power or other high voltage/high current tubes at a high enough voltage to be very meaningful. And matching of current is pretty much out of the question for all but the few "lab grade" testers that can apply high voltages at reasonable current levels to the tube. What your tube tester says with 150 volts on the plate will differ significantly from what my rig says at 465 volts! ... Remember - a tube's test results depends on the conditions under which it is tested!
So even if you have a good mutual conductance tester there are significant limitations to the testing you can do with it. And those limitations are even more significant when you have tubes like the KT170 that are higher power/current/voltage handling than the KT88/6550 tubes that were pretty much the highest rated power tubes of the day back when most vintage testers were developed.
My guess is (I have not tried it) you can get some info testing it using the KT88 or 6550 settings as long as the tester can provide adequate heater current. One way to determine that is to see if your tester will test a 6AS7 or 6080 - both draw more heater current than the KT170.
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Follow Ups
- RE: 6550/KT88. Your 539C is not going to be able to put 85 watts on the plate (nt) - Jim McShane 10:30:45 11/19/24 (1)
- RE: 6550/KT88. Your 539C is not going to be able to put 85 watts on the plate (nt) - John PA 07:20:06 11/20/24 (0)
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