Revelation suddenly quit working

Dennis Detweiler · Post by **Dennis Detweiler** » 3 Jun 2023 9:38 pm

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?

Dennis Detweiler · Post by **Dennis Detweiler** » 4 Jun 2023 4:47 am

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.

Larry Dering · Post by **Larry Dering** » 5 Jun 2023 3:47 am

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.

Dennis Detweiler · Post by **Dennis Detweiler** » 6 Jun 2023 10:12 am

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.

Larry Dering · Post by **Larry Dering** » 6 Jun 2023 12:45 pm

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.

Donny Hinson · Post by **Donny Hinson** » 7 Jun 2023 5:49 am

Well, since you got a fancy new (tube) preamp, might be time to pony up for a (solid-state #47) bulb!

https://www.amazon.com/Ruiandsion-Bulbs ... TT61T?th=1

Dennis Detweiler · Post by **Dennis Detweiler** » 7 Jun 2023 6:11 am

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.