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Topic: Revelation suddenly quit working |
Dennis Detweiler
From:
Solon, Iowa, US
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Posted 3 Jun 2023 9:38 pm |
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I warmed up the Rev, tuned up and noodled around before shutting it off for two hours before the gig. When I turned it on the pilot light lit up for a second, then went off. The fuse is ok. The tubes don't light, but I can hear the faint hum of the transformer. I installed 3 new JJ 12AX7mg tubes 3 months ago. Is there another fuse inside that could have blown as a result of a shorted tube or other component?
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
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Dennis Detweiler
From:
Solon, Iowa, US
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Posted 4 Jun 2023 4:47 am
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I opened it this morning. No bulging caps. Other components look normal. Nothing burnt. I plugged it in and still nothing except for the mild transformer hum. Tubes don't light. I'll likely have to send it to Brad.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
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Larry Dering
From:
Missouri, USA
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Posted 5 Jun 2023 3:47 am
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| That's a rare situation. I contacted Brad a few years back on a minor hum in mine. He was most helpful. No schematic can be found or offered. Only option is sending for repair. |
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Dennis Detweiler
From:
Solon, Iowa, US
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Posted 6 Jun 2023 10:12 am
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It was only the pilot light that burned out. The outside visual of the 12AX7MG tubes don't glow as bright as most, so I thought they weren't lighting. In a panic with 5 minutes before gig start time, I just switched out the Rev with a backup rack system.  So, the Rev is back to work with a new #47 bulb.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
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Larry Dering
From:
Missouri, USA
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Posted 6 Jun 2023 12:45 pm
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| Ha! I replaced the bulb in mine because it was intermittent. I replaced tubes and the on off switch as well. Nothing wrong with the tubes or switch but I was chasing a hum coming out my amp. |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Dennis Detweiler
From:
Solon, Iowa, US
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Posted 7 Jun 2023 6:11 am
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I wouldn't like being the one to install that tiny led inside that glass bulb any more than I would like to work in a cigarette factory putting cigarettes inside a pack of cigarettes.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
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