Sounds like it is only present when you are sending signal to the amp. Sounded quiet between notes. Pull the back cover and tap on your preamp tubes with a chop sticks or something similar. If one amplifies your tapping it is microphonic and needs replacement.
Other things to check
Cables
Filter caps
Input connectors
Output connectors
Microphonic ceramic cap
Speaker cone damage
Check all the easy stuff first. A microphonic tube is likely the culprit.
Other things to check
Cables
Filter caps
Input connectors
Output connectors
Microphonic ceramic cap
Speaker cone damage
Check all the easy stuff first. A microphonic tube is likely the culprit.
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