HOW TO IDENTIFY A BAD TUBE

For reference if you are looking at the amp, draw a line in your mind down the center. Tubes on the left side are the left channel, tunes on the right side are the right channel.

Visually Inspect all the tubes:

• If there is signs of damage internally, broken glass, or any other obvious sign of damage then replace the tube before moving further.

SIGNAL TUBE TROUBLESHOOTING:

1. Swap Both Tubes:

• Switch the small signal tubes left for right and check if the problem moves to the other channel.

• If the issue moves, one of these tubes is faulty.

• If the issue stays, the problem is elsewhere.

2. Isolate the Faulty Tube:

• Swap one tube from left to right.

• If the problem moves, that specific tube is bad.

• If the problem stays in the same channel, then the tube that was not moved is the bad one.

POWER TUBE TROUBLESHOOTING

1. Swap Both Power Tubes:

• Move the two left-side power tubes to the right side.

• If the problem moves to the opposite channel, one of these tubes is faulty.

2. Identify the Bad Tube:

• Swap one tube from left to right.

• If the problem moves, that specific tube is bad.

• If the problem stays, the tube that was not moved is bad.

3. Check for Multiple Failures:

• If both channels now have the issue, both the tube just moved and the tube that was not moved must be replaced.

NEXT STEPS:

• Once you've identified the faulty tube(s), replace them accordingly.

• If you do not find a bad tube, but have static/noise please check and tighten your tube sockets. You can find the guide HERE.