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Valve (Tube) Care
VALVE REPLACEMENT
WARNING! Output valves reach high temperatures. Please do not handle hot valves.
Always power down the amplifier and unplug from the mains outlet before changing
valves. If the amp has been operating, allow at least thirty (30) minutes for the valves to
cool down.
NOTE: Artist 20 models are cathode-biased and therefore do not need to be
biased.
OUTPUT VALVE BIASING (ARTIST 60+RT MODELS ONLY)
With the amplifier turned off:
•
Turn the SET control fully anti-clockwise.
•
Turn the BALANCE control to 12 o'clock (slot vertical).
•
Connect a test meter between the V5 RED test point and the 0V BLACK test point.
•
Set the test meter to read voltage (if the meter is not auto-range select the best
voltage range to be able to read up to 500mV = 0.5V).
•
Place the MUTE switch in the up position and turn the amplifier on. Allow it to warm up
for 5 minutes.
NOTE: Watch the test meter and if the reading exceeds 300mV (0.3V) switch
the amplifier off immediately.
•
Rotate the SET control slowly clockwise to get a meter reading of approximately
400mV (0.4V).
•
Move the test lead from the V5 RED test point to the V4 RED test point. Adjust the
BALNCE control to get a meter reading of approximately 400mV – clockwise to
increase, anticlockwise to decrease. Recheck the V5 RED reading as there is slight
interaction between these two controls.
•
After about 20 minutes, recheck and adjust if necessary.
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