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1) Power Cord Receptacle/Fuse Holder: Insert the AC cord (provided) rmly into the
AC connector. NOTE: Replace the AC power cord if protective jacket is damaged or
ground pin is damaged or removed. The fuse is located in a housing just below the re-
ceptacle. Replace only with same type and size. To remove the fuse, remove AC power
cord and pull out on the tab above the fuse symbol located on the fuse carriage. Place
the new fuse in the carriage clip and re-insert. NOTE: To prevent an electrical hazard,
DO NOT replace fuse without using the fuse carriage. Replace the fuse carriage if lost
or damaged before re-inserting the AC power cord.
2 & 3) Speaker Outputs—These 1⁄4” jacks are provided to connect the internal and/or
external speakers to the V100 amplier. The V100 amplier should never be operated
without a speaker plugged into a speaker jack.
4) Impedance Selector—This switch is used to select the appropriate impedance,
and is important in achieving the desired results from the V100 ampliers. The correct
impedance should be selected using the Impedance Selector Switch as follows:
a. Internal speaker only: 16 ohm setting
b. Internal speaker + external 16 ohm speaker: 8 ohm setting
c. Internal speaker + external 8 ohm speaker: 4 ohm setting, although it’s not matched
d. External 16 ohm speaker alone: 16 ohm setting
Incorrectly “mismatching” the amp to the speaker should not damage the amplier, but
would result in lower output powers, and could result in shorter output tube life.
5) EL34 Output Tubes—These power tubes were selected to provide the best com-
bination of performance and tube life, and shouldn’t require adjustment to their bias.
The amp uses a mixed-bias system which is a combination of xed and self-bias tech-
niques to give the user the best of both worlds. The result is that the amp will control its
own bias to a certain point, but without the typical reduction in power associated with
normal self-biased amp designs. The V100 uses four EL34s in a “push-pull” amplier
conguration.
6) Phase Inverter Tube—The phase inverter tube uses a single 12AX7 in what’s called
a long-tail pair conguration. This results in the most signal swing possible for driving
a power amp, and the most symmetrical drive capability, as well.
7) Effects Loop/Boost Tube—The Defender ampliers use an all-tube effects loop to
preserve the tube sound through the signal path. This single tube is used for both the
Effects Loop Send/Return and the footswitchable Volume Boost circuit.
8) Preamp Tube 2—This 12AX7 is used on both channels, but has the biggest impact
to the lead channel since it has the additional stage required for the very large amount
of gain.
9) Preamp Tube 1—This 12AX7 is the input tube, and as such, is the most likely to
cause microphonic problems, especially in the lead channel, and it is also shared by
both channels. If tube feedback occurs, it can usually be corrected by swapping this
1st tube with one of the other tube locations, since they have less gain following them
and are less prone to feedback. The rst tube also has the greatest affect on the
“cleaned up” tone of the amp, i.e. the tone when the guitar is turned down.
V100 Bottom
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