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PrimaLuna©ProLogue Eight
Troubleshooting
No output. Power is on, but power LED is off and tubes do not light up.
Mains fuse is out. Replace fuse per instructions on page 9.
No output. Power LED is on and tubes do light up normally.
The CD player stays muted for 30 seconds when powered on. Check to make sure
all interconnects are securely connected. If all seems to be OK check other
equipment in use.
Remote control does not respond.
Batteries are low and have to be replaced. Strong (sun)light may also disturb
the remote control signal. Make sure there are obstacles between remote control
and CD player.
Noise coming from one channel.
Noisy tube. First swap the 12AX7 tubes left to right. If noise follows tube swap,
than you have found the problem tube. If noise does not follow, swap the 12AU7
tubes left to right. If noise still persists, contact your dealer.
Hum coming from one channel.
Check 5AR4 tubes to make sure they are seated properly. Swap L to R , If hum
follows tube then replace faulty tube.
Noise/distortion coming from both channels.
Tubes may be in need of replacement. Read page 9 for tube basics and
replacement options.
Please also check the other equipment in use for failure or improper connections.
If you try these possible solutions and problems persist, contact your local distributor for
further investigation.
Tube Selection
While matched tubes are not a requirement, they’re still recommended if you want to get
superior results. You can get the very best in replacement tubes as well as rare vintage NOS
(New Old Stock) from us and other parties if you wish to upgrade. In the USA, Upscale
Audio’s inventory of New Old Stock tubes is the largest you can nd. Elsewhere, indepen-
dent suppliers can assist you in making the best choice