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Topic: BX500Tube |
Jack Stoner
From:
Kansas City, MO
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Posted 6 Feb 2016 5:56 am |
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The tube went bad in my BX500 after about a year of use. As an ex amp tech the tube can go bad anytime so I don't consider this a negative on the amp. Its the best steel amp I've had and plan on keeping it for a long time.
The symptom was I had a somewhat thin sound last night at a gig, sort of like what happens when the AC line voltage is low. I didn't think to bypass the tube (dummy) to see how it sounded, I just assumed it was the AC power voltage as we had several amps and the PA head plugged into the same power strip. This morning I tried it with the tube and the tube bypass. It was still bad (with good AC power voltage) on tube and OK in bypass. I replaced the 12AX7 tube with a NOS RCA 12AX7 and it restored the MB500's great tone. I don't know what the original 12AX7 was as there are no markings on the tube.
Last edited by Jack Stoner on 6 Feb 2016 3:38 pm; edited 2 times in total |
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Micheal Harvey
From:
Palm City, Florida, USA
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Posted 6 Feb 2016 8:03 am Mb500
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| Hello Jack do you prefer the MB500 over the Carvin. Please explain the differences. Thinking of going that route instead of a new amp |
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George Macdonald
From:
Vancouver Island BC Canada
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Posted 6 Feb 2016 9:20 am Mb500
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| Jack, Did you mean to say BX500? |
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Jack Stoner
From:
Kansas City, MO
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Posted 6 Feb 2016 11:04 am
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I meant BX500. I wasn't awake when I posted.
Sorry for the confusion. |
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