Power Valve Issues?

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Based on your description, it sounds like your power tubes red-plated. While this ‘could’ have been tube failure and a fresh set ‘might’ bring the amp back to normal operating condition, it is equally possible that failure of a component in the amp sent the excess current to the power tubes such that a fresh set would suffer the same fate. If you have a reliable tech nearby, that sounds like the best course of action.
 
Possibly power tube arced and took out the HT fuse, if it has one (I googled a picture and I don’t see one accessible on the back, there may be one inside on the pcb).

Sounds like mains fuse is fine if tube heaters still light up and everything else works.

Replacing HT fuse and replacing the bad power tubes may fix your problem, unless something else was damaged before the fuse blew, like a screen grid resistor or something.
 
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It sounds like your Randall Diavlo RD100H is experiencing some issues with the power section. Here are a few troubleshooting steps you can take before sending it to a technician:

  1. Check the Power Tubes:
    • Since the power tubes (6L6) flashed and then stopped producing sound, they might have failed. It's a good idea to inspect them visually for any signs of damage, such as a white or milky appearance inside the tube, which indicates a vacuum leak.
    • If you have a spare set of matched power tubes, you can try replacing them. Be cautious and gentle during the swap. After replacing, power on the amp briefly to see if there's any change. Avoid playing through the amp for extended periods until it has been properly biased by a technician.
  2. Inspect the Tube Sockets:
    • Ensure the tube sockets are clean and making good contact with the tube pins. Sometimes, dirt or oxidation can cause poor connections, leading to issues. Gently wiggle the tubes in their sockets to see if the sound comes back or if there’s any change.
  3. Check for Loose Connections:
    • Look for any loose or disconnected cables, particularly around the power amp section. A loose speaker cable could cause the symptoms you're describing.
  4. Fuses:
    • Check the fuses in the amp. If a fuse has blown, it could indicate a problem with the power tubes or another component. Replace any blown fuses with the correct type and rating, as specified by the manufacturer.
  5. Isolation:
    • Since the pre-amp section is working (as confirmed by the XLR output via your computer interface), the issue seems isolated to the power amp section. This helps narrow down the troubleshooting.
Regarding your question about using new matched valves: Installing a new set of matched power tubes for a brief test is generally safe, but there is a slight risk if the underlying issue is more complex (such as a failing component in the power section). Ensure the amp is properly biased after installing new tubes to prevent any potential damage.

If these steps don't resolve the issue, it’s best to send the amp to a qualified technician for a thorough inspection and repair. Handling high-voltage components can be dangerous without the proper expertise and equipment.

Good luck, and I hope your amp gets back to rocking soon!
 
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