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Exactly. With a meter to measure leakage current, you can start to see it at the microamp level. With only an LED, you are well into the milliamp range before you can start to detect leakage. While that's fine for tubes, more sensitive components like capacitors, can have their insulation damaged with higher current flowing. I also have to wonder how hard it could have been to stop the LED from burning out. Some 1N400X diodes to limit voltage drop and a resistor to limit current from there? It's the same thing we do with the IR LED in an optocoupler, to prevent it from burning out in a fault condition.

[QUOTE="Shockwave, post: 762803, member: 10882"] Exactly. With a meter to measure leakage current, you can start to see it at the microamp level. With only an LED, you are well into the milliamp range before you can start to detect leakage. While that's fine for tubes, more sensitive components like capacitors, can have their insulation damaged with higher current flowing. I also have to wonder how hard it could have been to stop the LED from burning out. Some 1N400X diodes to limit voltage drop and a resistor to limit current from there? It's the same thing we do with the IR LED in an optocoupler, to prevent it from burning out in a fault condition. [/QUOTE]

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