User manual

ca11 Troubleshooting

Some tips:

• No output. Power is on, but power LED is o and tubes do not light up.

AC cable makes bad connection in IEC connector. Please check.

• No output. Power is on, but power LED is o and tubes do not light up.

Mains fuse is out. Replace fuse as per instructions on page 5.

• No output. Power is on, but power LED is o and tubes do not light up.

Mains fuse is not out. Thermal protection may have switched oﬀ power transformer. If so, the preampliﬁer

will switch on again after internal temperature of power transformer returns to normal. Overheating might

be caused by higher environment temperature than normal or heavy use.

• No output. Power LED is on and tubes do light up normally.

Check input selector setting, input and output wiring; if all seems to be OK check power ampliﬁer.

• Hum or noise coming from one channel.

Noisy tube. First swap the 6SN7 tubes left to right. If noise follows tube swap, then you have found the

problem tubeset. Now swap one by one from left to right. If noise follows, you have found the problematic

tube.

• Hum or noise coming from one channel or two channels.

Check rectiﬁer tube 5AR4: swap with new 5AR4 tube, if hum disappears then replace faulty 5AR4 tube.

• Noise/distortion coming from both channels.

Tubes may be in need of replacement. Read page 6 for tube basics and replacement options.

Maintaining tube equipment can be easy if you have spare tubes. At least one tube of each type.

If you try these possible solutions and problems persist, contact us or your local distributor for further

investigation.

Mystère