MC240 buzz, please advise

[mauisurfer]

My MC240 started intermittent buzz on one channel only. Usually fine, just occasional,
and always good when it starts.
I notice tube v8 has only one light. It is 12BH7 tube.
There is no place on Maui to get a tube checked.
Should I swap with tube v3?
Should I buy a new tube and replace?
I have had this amp for only a year or two, and it was thoroughly serviced by Mike Zuccaro
in San Diego before I bought it. And I love it.
Suggestions appreciated.

 

[c_dk]

I think that anyone who runs a tube system should have a backup set of known good tubes........kind of like having a backup car so you don't have to rely on your British sports car.

 

[mauisurfer]

I think that anyone who runs a tube system should have a backup set of known good tubes........kind of like having a backup car so you don't have to rely on your British sports car.