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Guitars, Gear, Tone!
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PostPosted: Wed, Nov 20, 2019 8:05pm 
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Plank Cranker Wanker
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Anyone else have this happen? Three tubes in a year have failed. Gigging the amp 2-3 times a month.


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PostPosted: Thu, Nov 21, 2019 7:09pm 
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Rock God
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It’s shitty tubes, not the amp.


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PostPosted: Thu, Nov 21, 2019 7:36pm 
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Rock God

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Take some voltage measurements on the tube pins and report back? Pins 4,5, and 9, meter set to AC voltage. Then pin 1 and pin 6 meter set to DC voltage. Ground your black meter probe. You can also place your ground on pin 9 and read from there to your hot probe on pin 4 or 5. Doesn't matter as they are jumpered anyway. When you read pin 1 and 6 ground your black probe to chassis. You know how to do this Mel. Bases on the measurements we can tell you if it's the amp or like Paul says shitty tubes. More probable it's shit tubes. It could be a plate resistance causing to much voltage through, but doubtful.

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PostPosted: Mon, Nov 25, 2019 10:24pm 
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Plank Cranker Wanker
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Thanks for the replies. I’ll try taking the suggested readings and report back.


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PostPosted: Mon, Dec 02, 2019 1:42am 
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Rack Systems Ltd.

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Jj preamp tubes die. Nothing strange with the amp..

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