Hum Trackdown

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Hi, I have a McShaned Citation V that has some hum, I'm sure that it's my fault, at the outputs that I dig out and try to figure out every great while without success so far.

Anyway, I finally acquired an oscilloscope, a Tektronicx 2225, and was wondering if you guys had any tips on how to use it to figure out the area most likely responsible for the noise.

I'm guessing that I install a dummy load on the outputs, ground the probe to the amp's ground bus and trace my way backwards starting at the speaker output. What pattern on the scope am I looking for and what should it be set to?

Thanks.

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Topic - Hum Trackdown - DannyR 18:29:32 07/05/16 (6)

RE: Hum Trackdown - Chip647 19:34:37 07/05/16 (5)

RE: Hum Trackdown - DannyR 19:43:07 07/05/16 (4)

When the inputs are shorted the amp is dead silent. (great!) - Chip647 06:03:59 07/06/16 (3)

RE: When the inputs are shorted the amp is dead silent. (great!) - DannyR 12:56:00 07/06/16 (2)

"I've tried countless sources." - Triode_Kingdom 13:10:05 07/10/16 (1)

RE: "I've tried countless sources." - DannyR 22:54:42 07/11/16 (0)

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