Anything lower settings will not harm the tubes, but anything higher than:
•
43mV and up per tube for EL34s
•
52mV and up for 6L6s
•
61mV and up for KT88s
will lead to shortened output tube life or imminent failure.
Fuses
WARNING: Only check/change fuses with amplifier unplugged from the
wall socket!
Fuses are user-replaceable, and if a fuse needs replacement, always replace with the correct
"T" type and rating. The "T" stands for "Time delay" also known as "Slow Blow." Also be sure to
use the correct amperage rating (Ex. 1A = 1 Amp). These fuses are the 3AG type and are
commonly available. The correct fuse values are located on the back panel of the amplifier.
If a fuse blows, it's a good thing! Fuses are put in place for safety and to protect the most
expensive parts of the amplifier. Fuses can blow for various reasons, however the most
common is a output tube failure. To check if a fuse is blown, push and twist counter-clockwise
to remove the fuse holder and see if the small wire inside the glass is broken. There may also
be a burnt area the inside of the glass.
If you replace a fuse, and it blows again, there is likely a more serious problem. Please contact
us before changing the fuse again at
so we can further assist you with
the trouble-shooting.
Safety
•
Always use a 3-prong cable into a grounded outlet. This makes sure the amplifier is
always grounded and safe in the rare occurrence the chassis should become "live"
(electrified).
•
Tubes become very hot during normal operation. Allow them to cool before handling
to prevent burns.
•
Never change tubes with the amplifier ON.
9
Summary of Contents for Sister
Page 1: ...1...
