8
of these two fuses MUST get changed to 2 1/2 AMP SLO-BLO for any voltages higher than
120VAC.
The 1 AMP FAST-BLO fuse remains the same value regardless of input voltage.
The speaker Impedance switch is shown adjusted for 8 ohms, which the standard setting
for a single Guytron GT-212 cabinet. Use a penny to adjust it to the correct impedance for your
application. For (2) Guytron GT-212 cabinets, the correct setting is 4 ohms. The speaker jacks
are in parallel, so the selector should reflect the total parallel impedance for whatever is plugged
into the two speaker jacks. I do know of people deliberately mismatching the amp and cabs, for
tonal reasons. An impedance mismatch will cause different harmonic overtones in the output
section. It will also lower the power efficiency of the output section. I have endeavored to make
the transformers as tough as possible, and I have not seen any come back blown yet. However, It
is still a practice that would void your warranty.
About the Sample Settings:
These sample settings are provided as a starting point that steers you towards a certain
character of tone, not as proof and comparison study. They were never intended to be exact
copies, only functional equivalents. In addition, many things make for an old amps character, old
and worn, or even damaged parts sometimes add to the uniqueness of tone. That’s what old amps
are for!
These sample settings were done with a maple neck Telecaster, it was chosen for it’s
excellent blend of clarity and sustain. It has a light ash body, stock vintage VanZandt pickups,
stock wiring with volume and tone were kept full up (to eliminate coloration). We also used, .010
gauge GHS boomers, 18.6’ pro-co lifeline guitar cord, and matching Guytron 2 x 12 cabinet. (I
mention all these things because they are important factors, and I have found that all things
involved influence the production of tone) During the sampling the master tone settings were all
at twelve o’clock and it’s a good idea to always start there when looking for your tone. The level
settings are primarily for relative channel levels but do make a slight difference in tone. The
recommended starting point is straight up. Obviously, physics dictate that these can only be an
approximation, but in terms of usable tone I believe you’ll find that it’s like splitting hairs. Only
much more fun!
CHANNEL A SAMPLE SETTINGS
SETTING
GAIN
TONE
LEVEL
DESCRIPTION