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HOW TO PROPERLY USE THE EFFECTS LOOP 
 
Much confusion exists among musicians as to the proper use of the variable send/receive effects loop.  Follow-
ing these simple procedures will help you to set the levels for the best operation of your particular effects chain.  
 
1.
Set both “Send" and "Receive" controls at "5".  
2.
Insert your effect and activate it. If your effect has input/output levels, set them at "unity gain" - same level 
activated as bypassed. Use "instrument" level on rack effects. 
3.
While in the clean channel, play a few chords at normal volume and increase or decrease the "Send" level to 
a point where there is no distortion noticeable through the effect.  If your device has clipping indicators, set 
the "Send" level just below the clipping level. NOTE: For best S/N (Signal to Noise) ratio, it is important to 
have as "hot" a drive level as possible. The most common mistake made by musicians is to “send" too low a 
level to effects, and then "receive" with too "hot” a level.  All the noise present in the output circuitry of the 
effect and the connecting cords are then amplified. and the noise level is increased. Of course, nobody 
wants more noise than is absolutely necessary.  
4.
Set the receive level to match unity gain. (Effects device activated level bypassed level). Of course, if you 
want, it is permissible to increase receive gain above unity but noise will be the result as well as less head-
room for the power amp section.  
5.
A final check for effects loop matching vs. normal levels in your amp is to play a chord then quickly remove 
the "Effects In" plug and see if there is an increase or decrease in volume.  Then further adjust the receive 
gain to match the normal level within the amp to keep over-all headroom and power at optimum.  
6.
The use of multiple effect complicates the procedure greatly but the following rule also applies.  Simply think 
of the output of each effect as the “send" for the following unit. GENERAL RULE OF THUMB: "Send with as 
much level as you can without distorting the effect. "Receive" with the minimum level possible to reach unity 
gain with or without the effect activated.  
 
NOTE: When using some types of effects such as distortion or overdrives, it may be useful to increase the 
"Send" level above normal to cause more drive within the device.  It is unlikely that damage either to your amp or 
effects devices would ever occur within the range of levels possible in the effects loop. but the settings affect 
headroom. distortion level and S/N ratio.  — And. when all else seems to make no sense, USE YOUR EARS!!! 
(That's what designers and engineers ultimately rely on) 
 
WARRANTY 
 
Your MosValve combo amp is warranted for a period of ONE FULL YEAR against defects to the original regis -
tered owner provided he/she has returned a completely filled-out OWNER'S REGISTRATION CARD. This war-
ranty covers parts and labor only, shipping charges remain the sole responsibility of the owner.  Damage due to 
modification or abuse is excluded from this warranty. Before returning any unit for service, a RETURN MER-
CHANDISE AUTHORIZATION NUMBER (RMA#) must be obtained by calling 480-941-0705.  
 
WARNING !!! 
 
As indicated on the rear panel of the MosValve Combo, the following are additional warnings:  
 
The use and operation of this device constitutes an agreement of full release of any and all liability con-
nected with such use. Only personnel familiar with high-power audio equipment should attempt to operate 
this device.  
 
In addition, by the use of this device, the user agrees to hold Tube Works, its designers, sales agents and all 
other affiliates and related parties harmless in the event of any accident, injury, damage or loss resulting 
from such use.  
 
Manufacturer's sole responsibility is to provide a warranty on the specified performance of the product under 
normal conditions for a one-year period.   
A division of Genz Benz Enclosures, Inc.  
 
7811 E. Pierce St.  ¿  Scottsdale, AZ 85257 
Ph: 480-941-0705   Fax: 480-946-2412 
www.genzbenz.com