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It is OK and normal for the bias reading to fluctuate a little bit and may not be
exactly 80mA but as close as possible.
IMPORTANT: Set your meter to DC Current, your meter should read (mA)
Good Bias
STEP 12
Power down Steps:
1. Turn OFF the amp
2. Disconnect the meter leads.
3. Unplug your AC cord and wait for the tubes to cool down, so that you can put
back the bottom lid.
IMPORTANT: During biasing and normal amp operation if there is a burning smell
or loud crackling noise that comes from the speaker, you should turn off the amp as
your may have a bad tube. The same is true if your meter reads higher that 150mA
or goes into overload. The tubes should never glow RED on the gray plate material,
the largest metal part inside the tube. This indicates a major problem and extremely
unsafe condition. If this happens turn off the amp immediately!
IMPORTANT: The tubes get very hot! Don’t touch them, you will burn your
skin if you do. If the amp is ON the tubes will get hot, even if you are not
playing the amp, wait 30 minutes before handling the unit to ensure the amp
cooled down.
IMPORTANT: This is not the only way to set the bias on this amp, this is the
Carvin Approved method which is used on the Production line in the San Diego,
California Factory.
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