Amp Lights Up
,
- No Sound
- check / test / replace - the 1/2 amp
H
.
T
.
fuse for continuity with a digital Ohm meter. It
may be blown. Check the speaker connection at back of amp and at the input of cabinet.
- bypass all pedals and effects and plug your guitar into only the amplifier.
- check your guitar cable.
- check the power and the pre amp tubes and make sure that they are installed correctly and
that the filaments within each tube are lit. Sometimes they can look operational -
(with the
filaments lit)
- but be defective in not passing signal. This is rare, but can occur.
Amp is making a
"
Humming
",
"
Hissing
",
"
Feedback
"
or
"
Crackling
"
- sound
This is most likely a bad pre amp tube. Pre amp tubes can develop problems over their life
span. They may be operating flawlessly, and they may also test fine on a tube tester, but for
what appears like for no reason, can suddenly begin to make a "
hissing
" or a "
crackling
"
sound. They can begin to feedback or have microphonic or "
ringing
"
symptoms. (
See previous
section titled: ECC 83, 12AX7, 7025, and CV4004
), or develop filament "
humming
" - which is a
low background hum, often mistaken for a problematic filter cap.
Filament "
humming
" is much more common with newer - modern available pre amp tubes.
Unfortunately, you will most likely have to replace one of more of your pre amp tubes with
any of these problems. This is another reason we stress purchasing n.o.s. tubes – they are less
likely to "go bad ". Fluorescent and neon lights, rheostat wall dimmers, and some
appliances may alos cause your amp to contain a "
hum
" or "
buzz
" sound. Also, check your
guitar cable if you discover that the problem is not a pre amp tube.
Over time, the input jack may occasionally make a
"
crackle
"
sound when you extract your
instrument cable from the front panel of your amp. This is usually due to a dust / contaminate
build up on the input jack’s ground shunt. This would require that the inside of the input jack
be cleaned professionally. We recommend using
DeoxIT
®
Gold
G5.
SERVICING THE KOMET
SONGWRITER
30
We are very confident that your Komet
amplifier is one of the most reliable amplifiers ever
built. A combined experience of many decades of design and service has been applied to the
construction of all Komet
amplifier models. We have been inside thousands of amps and we
have seen every type of problem that can occur. Great care has been taken to anticipate and
prevent such problems in your Komet
amplifier. Every part and component in this amp is
carefully chosen for its specific performance.
(continued)
Copyright 1999-2017, Komet
Amplification. Group, L.L.C. May not be reproduced in any form without express written consent from Komet
Amplification.
