LOAD RESISTOR PLUG VALUES AND SOUND EFFECTS
The Front Panel Section, under the paragraph describing the Load Resistor Input,
includes suggestions for altering the amplifier input impedance to match the impedance
of the pickup(s) in your instrument. The information in the chart below and the
instructions that follow have been provided to enable you to further customize your
sound by making your own load plugs using capacitors, resistors, and RCA input plugs
available at most hardware or electronics stores. Various capacitance and resistance
values are given, with a description of their overall effect on your sound.
With each Seymour Duncan Convertible Combo amp YOU receive the following two (2)
load resistor plugs:
Load Input
Value at 1 kHz
500k
Capacitance
(in picofarads)
3300pf
Resistance
(in ohms)
10k
Sound Effect
Use with acoustic
pickup to enrich
tone
1 meg
-0-
1 meg
Will make tone
slightly smoother
sounding
Other plugs that you can build yourself include:
Load Input
Value at 1 kHz
26k
Capacitance
(in picofarads)
.01
Resistance
(in ohms)
10k
Sound Effect
Slightly rolled off
high-end. Use in
bright sounding
room or with
pickups that are too
bright
11.5 k
.1
10k
For mellow, smooth
jazz sounds
10k
-0-
10k
Quietest operation
when using
Low
Impedance pickups
How to make a load resistor plug:
Purchase raw RCA plugs and resistors at an electronics hardware store. Using a single
resistor with a value of 1-ohm - 4.7 meg ohm, 1/8 watt or 1/4 watt, simply solder it to the
hot (pin) and to the ground (crown). You can also try different value capacitors with
physical size being your only limitation. For reference, you may want to examine one of
the supplied load plugs and compare.
