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I’ve not tested one before but I think you would need a high voltage/high frequency scope to test the output with a good hf tube fitted
Yes, it's looking more likely that I'm not going to be something I can do in my shed.
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I’ve not tested one before but I think you would need a high voltage/high frequency scope to test the output with a good hf tube fitted
am I being dumb here? power up both the new and old ballasts,
try a new tube in each in turn. note result
try a suspect tube in each. note result.
there are no serviceable parts inside the ballast so you are really only trying to find out if they work?
Know by hot or cold if goosed
By definition, if the old ballast won't drive new good tubes, it's faulty. That much you will already know before it reaches the bench. What you really want to find out is why they failed, which can normally only be done by internal examination and possibly detective work. External tests probably won't reveal anything.
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