Tube Layout, Replacing Tubes - Octave Phono Module Manual

4.6. Tube layout, Replacing tubes

Tube Layout:
3
Tube (ECC83, 12AX7) is the Input Tube. Please use Low Noise Tubes of high
quality with matched systems.
2
Tube (ECC81, 12AT7) is for the Main Amplification Stage.
Tube (ECC88, 6922, 6N23, 6N1,) is for the Output Buffer.
Replacing tubes
Before removing the top cover plate, make sure that the Unit is switched
OFF and that the Power Supply is disconnected from the mains!
Important! Changing tubes is a job for a qualified technician!
1. Unscrew the six TORX screws from the top cover plate and remove the plate.
2. Remove the old tubes. Carefully remove the tubes from their sockets, taking care not to
exert sideward pressure on the sockets.
3. Insert the new tubes.
Please ensure that the tube pins are all perfectly straight before inserting your new tubes.
Straighten any bent pins very carefully by hand if necessary. No adjustments are necessary
to your amplifier after fitting such with new tubes.
4. Cleaning tips
Cleaning agents and contact liquids are not recommended for tube sockets. Clean dirty
sockets with compressed air and carefully clean tarnished tube pins using a wire brush.
4. MAIN UNIT
2
ECC88
15
3
ECC81 ECC83