Version 3.2
Page: 63
More Tips for fine tuning your amp
Reprinted with permission from Aron from diystompboxes.com
These are very simplistic modifications you can do to your amp, let your ears be your guide:
•
Change coupling caps; changing to smaller values reduces bass, changing to larger values adds
more bass. Reducing the value of coupling caps can help eliminate "flabby" bass syndrome.
•
Change cathode bypass caps. Adding a cathode bypass cap to a stage that doesn't have one will
let the stage have more gain. Just like coupling caps, making the value larger adds bass -
generally 25uF allows almost all bass through, .68uF are used in some Marshalls for a more
midrange boost and 1uF and 5uF are used in some high end fusion type amps. Again, smaller
values can help reduce "flabby" bass.
•
Change cathode resistors - larger values reduce gain, smaller values give more gain. A "trick" is
to connect a 5K+pot wired as a variable resistor instead of the standard cathode resistor - now
you can turn the pot and dial in the perfect tone. After dialing the sound, remove the resistor
and pot and measure it. Substitute the nearest standard value resistor in place of the pot plus a
resistor.
•
Add grid stopping resistors to help tame oscillation. If you have oscillation with your amp, you
can sometimes help it by installing grid stopping resistors. The grid stoppers can also subtly roll
off high end as well.
•
Add high frequency roll off caps in parallel with the plate resistor. This is sometimes used to
"mellow" out a stage (reduces highs).
•
Adjust the grid leak resistor. Reduce the value to attenuate the signal into the stage to control
the gain.
•
Use a shielded cable from your input jack to the first gain stage. This can reduce RF, buzz and
general reduce noise.
•
Replace all plate resistors with metal film types. This can help reduce hiss..
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