There is an intermitent problem with my Hot Rod Deville 410, the amp is warmed up and operating fine at moderate volumes, suddenly there is what sounds like a chord short and the channel switch light on the amp starts flickering and there is a fairly loud whinning sound. Powering off the amp fgor 1 minute fixes the problem, and the amp will function ok until it randomly occurs again. This problem may occur more frequently at louder volumes. I visually checked the board - the input jacks are soldered securely, the only problem I found was that the middle 12AX7 tube has an audible whine whenthe amp is on
Music - Fender - Hot Rod Deluxe Guitar Combo Amplifier
Answers & Comments
Hi sjtdvm,
To isolate the problem try another guitar with the amp just to make sure if it's a guitar or amp issue. If the guitar is working properly you need to check the tubes to be sure that the connections are all seated into the slots completely. Sometimes the tubes will start loosing power that makes the sound fluctuate up and down. Please check the solder on the tube sockets if it has crack, often it caused variety of noise and wired sounds in the amp. Inspect the back of the amp on the tube pc board, it will reveal failing solder. You will usually find cracked solder on the tubes socket pins. And at the bottom center of the main board are two 5w resistors, usually 470 ohm or 330 ohm. Poke at them. Depending on how much use they have been played it may be a good suggestion to then replace your tube's. You will notice a big difference with newer tube. But remember the bias must be set correctly to match the new tubes so they won't over heat.
Hope it helps.
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