7
startup. If the break is very much longer than that, both switches should be in the down position.
If nothing else, just to conserve energy. Tube life is also extended if the amp is allowed to warm
up at least a minute, before turning the standby switch to the "On" position. This is less of a
strain on the tubes, as well as the rest of the amp.
As for the Purple pilot light, this is an old tradition of mine that dates back to the late
70’s. I used to get a lot of these old Kustom amps in the shop. You know, the cool padded ones
you could sit on during those long boring practices. (I still think that was a stroke of genius)
They had the cool purple lights, which also happened to fit my old Fender amps perfectly. After
that, every time I did any "Custom" work on a Fender amp, I would grace it with a "Kustom"
purple jewel. Some years later on a parts run down in Detroit, I came across several hundred of
them, and that cemented the tradition. By the time the 90’s rolled around, they were once again
popular and back in production, and so there was never any decision as to which kind of pilot
light we should use on the GT-100.
The GT-100 now comes stock with the ability to travel internationally. The back panel is
outfitted with a fused Primary voltage selector switch, which is built in to the IEC connector. To
adjust for different countries, use a small screwdriver to pry out the square voltage selector cap
(shown below) socket. Simply, install the proper fuse rating for your voltage requirements, and
rotate the cap until the correct voltage lines up to the triangle marker on the right.
There are a total of three user accessible fuses for the GT100 for extra protection and safety.
IMPORTANT!
For domestic USA amps there are two (5 AMP SLO-BLO) fuses, one is under the
voltage selector cap, and the other is located in the fuse holder marked 5 AMP SLO-BLO. BOTH
IMPEDANCE
SELECTOR
8
GUYTRON L.L.C.
MADE IN U.S.A MODEL: GT-100
BROOKINGS, OR PATENT PENDING SERIAL:
5 AMP SLO-BLO
1 AMP FAST-BLO
100/120VAC ~ 5.0A SLO-BLO
220/240VAC ~ 2.5A SLO-BLO
50/60 HZ — 650 WATTS
NO USER SERVICABLE PARTS
INSIDE.
!
WARNING! SHOCK HAZARD!
SPEAKER
120
Voltage selector cap
(Shown set for 120VAC)
Impedance Selector Switch
(shown set for eight ohms)