Module Preamp Tubes
The 1 2AX7 Tungsram tubes will give you the least amount of noise and the
sweetest tone. However, they can
develop a micro phonic ringing when subjected
to a lot of bumps from traveling. Here are some ways eliminate micro phonics.
1. Polish 1 2AX7 tubes are constructed differently than the Tungsrams. Although
Polish tubes are noisier and harder sounding, they are less subject to micro
phonics. Radio Shack and other companies offer Polish tubes. "Made in Poland"
is stamped directly on those tubes so you can be sure where they come from.
2. Try using a FET or IC module. Because neither of these are tube designs,
you'll get no micro phonics. For a warmer tube sound, use an FET module. If you
are after a harder solid-state sound, use an IC module.
If you're involved in a touring schedule and you want to avoid tube related
problems, bring some extra tubes with you for all your equipment.
TROUBLESHOOTING
The following table should enable you, with little or no knowledge of electronics,
to isolate the cause of some problems you may experience with your amplifier
and the steps required for repair. Most causes of impaired amplifier performance
are due to minor problems or irregularities, which can be easily corrected by you.
However, if you cannot identify the cause of the problem using the table below,
or if it indicates your amplifier to be defective and in need of repair, return the unit
to your authorized Seymour Duncan Service Center or call
(805) 964-9610
for a
Return Authorization number.
Symptom
Probable Cause
Remedy
Amplifier does not come
on when power switch is
"ON".
1) Power not connected
1) Ensure power cord is
plugged into power outlet
2) Blown amp fuse
2) Check amp fuse;
replace if blown with
250VAC 3.15
amp
SLO-BLOW
