Carr Rambler Amp Manuel d'utilisateur télécharger pdf (Page 4)

CF COMP

– Controls the amount of preamp compression and sets the

compression threshold of the cathode follower. Many models default to zero as

they do not have measureable compression.

CRUNCH – Makes things more crunchy. It controls the distortion texture when

you hit a note or chord.

DYNAMICS – Controls a dynamics processor that can be used to alter the

dynamic response of the amp algorithms. When set below zero the amp

compresses resulting in a smoother, less dynamic sound. When set greater than

zero the amp expands resulting in a punchier, crunchier and more dynamic

sound. Note that extreme values can have undesirable side-eects such as

pumping and clipping.

OUTPUT COMP – Leveling compressor (think LA-2A) specically tailored to

reduce the output dynamic range of the Amp block. It can also be used to

simulate the compression you get from a dynamic microphone and/or some

mic preamps. The parameter value is the compression ratio, which equals 1 + 3

* comp / 10. Attack and release are xed.

COMP THRESHOLD – Sets the level at which OUTPUT COMP reduces the

amplitude of the audio signal when that level is exceeded.

BIAS EXCURSION – Grid modeling parameter that controls how much the

power tube grid voltage droops when the grids conduct.

EXCURSION/RECOVERY TIME – Grid modeling parameter that controls the time

constants associated with BIAS EXCURSION.

SUPPLY SAG – Controls power supply impedance. Higher settings simulate

higher power supply impedance, causing greater tube plate voltage (B+)

“droop” and giving a more compressed, spongy and looser feel. Sag interacts

with the MASTER: as the power amp is pushed and draws more current from its

power supply, Sag has more eect. Sag values around 2 simulate a solid-state

rectier, 4-6 a tube rectier.

PREAMP SAG – OFF replicates the behavior of separate preamp and power

amp. ON replicates the behavior of an integrated tube head or combo amp.

B+ TIME CONSTANT – Associated with SUPPLY SAG. Controls rate of change in

power tube plate supply. “B+” refers to one of the high voltage “taps” or outputs

of the main power transformer. Lower values give a bouncier feel, while higher

values give a tighter, more aggressive feel. The eect of lower B+ is equivalent

to increasing XFORMER MATCH. A lower B+ means the plates clip sooner which

is the same as increasing the turns ratio on the transformer. This is assuming

that you rebias since typically lower the B+ aects the bias.

PREAMP BIAS – Controls the bias point of the last triode (cathode follower not

counted) in the preamp. Depending on the bias points of the previous stages

increasing or decreasing this value can alter both the harmonic content (the

ratio of even/odd harmonics) and the attack characteristics. The further you

move away from (roughly) zero the more even harmonics are introduced. It’s

an asymmetric transfer function so you have to experiment. Typically, if the

previous stage has a negative bias then increasing this value will be more

noticeable and vice-versa. Use with PREAMP HARDNESS.

PREAMP HARDNESS (was TRIODE HARDNESS) – Controls how sharply the

triodes enter saturation and can be used to simulate softer/harder tubes. The

eect is subtle and most apparent at edge of breakup. Lower values give softer

saturation and will sound softer (naturally) but have less note separation. Triode

Hardness at zero gives a smoother distortion with reduced upper harmonics.

Higher values give a more aggressive breakup and better note separation.

Defaults to an appropriate value when an amp model is selected.

PICK ATTACK – Controls a sophisticated dynamic range processor that operates

on leading edge transients. Negative values reduce pick attack while positive

values enhance it.

CATHODE TIME

– Sets the attack time of the compressor.

CATHODE RATIO

– Sets the maximum amount of compression, with lower

values giving more compression.

The cathode “squish” modeling algorithm improves the feel of cathode-biased

power amp models (Class-A, Mr Z, etc.) It has two adjustable parameters:

CATHODE SQUISH – Sets the amount of bias shift due to cathode voltage rise.

(Zero defeats the cathode squish modeling.)

SQUISH TIME – Sets the time constant of the cathode network.

cathode follower algorithm parameter

Amp Block

In general, the more heavily driven the power amp section is, the more eect

the SUPPLY SAG has. Setting SUPPLY SAG to 0 disables the power amp and

turns the MASTER into a simple level control with a 40 dB range.

Ghost notes are the result of a 120Hz signal plus harmonics getting past the

power supply ltering. High SUPPLY SAG along with low B+ TIME CONSTANT

can cause “ghost notes” when POWER SUPPLY TYPE is AC (as in a real amp).

Lower B+ Time Constant values will make the amp feel “faster” but too low

can cause ghost notes.

To hear what ghosts notes sound like, try the following: take an amp like

Plexi 100W, turn the SAG up and the B+ TIME CONSTANT down, then play

single notes around the 5th fret on the G string. You should hear a tone

unrelated to the pitched note.

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Carr Rambler Amp Manuel d'utilisateur Page 4

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