Tube Replacement - Komet Aero 33 Owner's Manual

Please note: your amplifier produces heat. Prolonged gigs, outdoor or non-climate controlled
venues, only multiply that factor. We suggest after extended play - that you allow for a sufficient
amount of time to pass - so as to let your amplifier cool down prior to moving or loading. This
will help protect and extend the lifespan of the audio tubes and internal components from
excessive vibration or damage.
Please pay close attention when extracting and installing the power and pre amp tubes. The pins
must align perfectly into the tube's socket. Bent tube pins, especially when forced into a tube
socket, can cause serious damage to an amplifier's tube socket pin inserts. This results 99% of
the time with the tube socket needing replacement. To avoid this contingency, we recommend
that you purchase a miniature pinned, nine hole, pre amp tube pin straightener. These can be
found on line from many vintage tube retailers. This easy to use device guarantees that your pre
amp tube and EL84 power tube pins will be straight and aligned for socket insertion.
Amplification's warranty will not cover damage done to a tube socket's insertion pins
Komet

from forced or accidental mis-alignment / and or bent / crimped insertion pins.

TUBE REPLACEMENT

A noticeable deterioration in your amplifier's overall sound is an indication of an imminent tube
replacement. You may notice symptoms such as
tightness or punch , a weak sounding treble and bass, and loss of certain sonic frequencies or
" "
bloom . We suggest that you first start by replacing your power tubes. Pre amp tubes can
note " "
last a very long time, and do not necessarily need to be replaced as often as the power tubes.
However, we do recommend that you have both the pre amp and power tubes properly tested by
a technician between servicing.
BIASING THE AERO
is a cathode biased amplifier. An internal resistor sets the amplifier's power tube
The Aero 
33
bias. A bias adjustment should not be necessary. To guarantee your amplifier will operate
properly in conjunction with the supplied voltages and the current draw of the Aero
recommend that when you replace your power tubes, that you purchase a matched set of
EL84/6BQ5 labeled by the manufacturer with a low IP number
s
or grade and labeled as well with a transconductance
draw number)
Having matched power tubes ensures that all of the power tubes will operate and react equally
within the amplifier. Matched power tubes will also guarantee better harmonics, sonic
performance and extended tube life. Most reliable and reputable audio tube vendors and n.o.s.
tube dealers sell their power tubes in matched, output power or plate current draw, numerically
rated sets. You should be able to request a certain
from your tube vendor.
(continued)
Copyright 1999-2017, KometAmplification. Group, L.L.C. May not be reproduced in any form without express written consent from KometAmplification.
muddy
"
33

IP (plate voltage /current draw)
or saggy power chords, a loss of
" " "
(or a low plate voltage / current
matching numbers.
(Gm)
Please note:
 , we
33
grade or range