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BYPASS and ENGAGE Volume LevelsYWhile playing guitar, turn S E N Dand RETURN up together* to
Use the SEND and RETURN level controls to normalize (makematch the bypass levelset above (or to any alternate volume
level). This is your engage level.
equal) the ENGAGE and BYPASS volume levels. Or, set the
two levels unequal to create a preset alternate volume level,YBy quickly switching between B Y PA S Sand E N G A G Ew h i l e
selectable from the Footswitch. Note: The alternate volumeplaying, you can fine tune these settings.
level will function with or withouteffects devices plugged into
the loop jacks.*Hear unwanted distortion?Turning SEND and RETURN up at
Setting effects loop levels.the same rate is usually a good way of setting levels quickly
YTu rn S E N Dand RETURN knobs down to O1.�that will work with an external effects device. But with multiple
effects devices or with devices having their own level controls,
YB Y PASS the effects loop from the rear panel or the Footswitch.
unwanted distortion may develop. Try reducing the SEND
YConnect effects device(s) to the rear panel S E N Da n dlevel or the level controls on individual effects devices,
R E T U R N jacks (optional for alternate volume level setting).
(increasing RETURN or MASTER will restore the overall
YPlay guitar and set the amp and instrument levels as pre f e r re d .volume level). Listen for improvement after each change.
This is your bypass level.Experiment to find the right settings.
YENGAGE the effects loop.
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E E . V9 & V11 T ROUBLE LED* - Functional only withOUTPUT TUBE BIAS & BALANCE ADJUSTMENTS.
the S TAND BY switch in the UP p o s i t i o n . This LED
glows re d when either the V9 or V11 tube has failed.1.Warm up the Pro-Tubeamp for 2 minutes with STAND
F F. FUSE V9 & V11 (F1)** - Protects the amplifier fro mBY switch DOWN and OUTPUT POWER set to FULL.
damage if the V 9 or V 1 1 tube were to fail. If this fuseSet SPEED and INTENSITY to O1O and toggle TREMOLO
fails, replace the tubes in locations V 9 & V11, this fuse,OFF. Put the STAND BY switch in the UP position.
then set the BIAS and B A L A N C E.2.Remove the bias controls cover box.
GG. BIAS ADJUSTMENT - Trim adjustment used in
conjunction with BIAS test points to set the proper
3.Set BIAS: With a DC voltmeter, measure VDC between
tube BIAS.the OGND� and OV9,V10� test points. Adjust BIAS for .06
HH. BIAS TEST POINTS - Test points used to measure
output tube BIAS.VDC (60mVDC).
II. BALANCE TEST POINTS - Test points used to4.Set BALANCE: With a DC voltmeter, measure VDC
m e a s u re the B A L A N C E between power tubebetween the OV9,V10� and OV11,V12� test points. Adjust
sections.BALANCE for zero (0) VDC.
JJ. BALANCE ADJUSTMENT - Trim adjustment used
in conjunction with the BALANCE test points to set5.Replace the bias controls cover box.
the proper tube BALANCE.
K K . V10 & V12 FUSE (F2)** - Protects the amplifier fro m
damage if the V 1 0 or V 1 2 tube were to fail. If this fuse
fails, replace the tubes in locations V 1 0 & V12, t h i s
fuse, then set the BIAS and B A L A N C E.
LL. V10 & V12 TROUBLE LED* - Functional only with
the S TAND BY switch in the UP p o s i t i o n . This LED
glows re d when either the V10 or V12 tube has failed.
*The TROUBLE LEDs do not indicate tube wear.
Tubes may be Oworn� and sound weak even when
the TROUBLE LED still glows green. DO NOT WAITIMPORTANT
FOR TUBE FAILURE TO REPLACE TUBES, (see1.Make BIAS and BALANCE adjustments only when
OTube Replacement� on the next page).necessary. Take your Pro-Tube amp to the nearest
authorized Fender Service Center if you are not sure
**Only replace a failed fuse with the proper type asabout the settings.
indicated under OSpecifications� on the next page.
The fuse item F1 & F2 are used for tube failure2.Always set BIAS first, then BALANCE.
protection. If a fuse repeatedly fails, consult with an3.If the output tubes (6L6GCOs) cannot be BALANCED,
authorized Fender service technician.replace the output tubes (V9, V10, V11, V12), then set
BIAS and BALANCE.
Visit Fender online at:
w w w . f e n d e r . c o m
w w w . m r g e a r h e a d . n e t
www.fender.com 6 www.mrgearhead.net |
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