Pro Audio Asylum

Ampeg SVT4 pro hum

71.225.140.144

A friend of mine has an Ampeg SVT 4 bass head. He was telling me it has a hum. Constant low level hum. sounds like a 60hz hum.
Do you guys think it could be from a microphonic tube?
That was my first guess.
Thanks

Edits: 08/06/09

Follow Ups:

RE: Ampeg SVT4 pro hum - FenderLover 07:41:58 09/01/09 (0)
RE: Ampeg SVT4 pro hum - Dman 07:00:25 08/14/09 (0)
RE: Ampeg SVT4 pro hum - Pro Sound Guy 11:00:27 08/07/09 (3)
- RE: Ampeg SVT4 pro hum - FenderLover 05:37:25 08/08/09 (2)
  - RE: Ampeg SVT4 pro hum - Pro Sound Guy 12:57:15 08/10/09 (1)
    - RE: Ampeg SVT4 pro hum - FenderLover 04:40:41 08/14/09 (0)

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