I don’t have time to type right now, but here are the images from the analysis for a 2 Channel Orange, 3 Channel Vintage on ch 2, and 3 Channel Vintage on ch 3. The responses of the 2 Channel Orange and 3 Channel Vintage on ch 2 are very close. Other factors could influence the differences between them.
Archive for July, 2016
Tags: amp, Boogie, Dual Rectifier, filter, Mesa, Presence, Settings, Tone, Vintage
Tags: amp, Boogie, design, Dual Rectifier, engineering, filter, Mesa, Presence, Vintage
I very quickly drew the negative feedback filter controlled by the presence control when using Vintage mode on a 2001 3 Channel Dual Rectifier. The red line represents the -3 dB half boost mark from the point of the most filtering. I tried drawing the entire phase inverter, but it didn’t make a difference on the plots, so I removed it and kept it simple.
R2 is being instructed to act as a variable resistor with 11 points to represent each 30 degrees of travel from 0 -10 on the control. Anytime a part of the plot goes below the red line, the feedback is lessened by quite a bit and those frequencies pass the phase inverter more easily. The maroon line on each picture is representing the control being at maximum and a massive amount of the frequency band is passing easily. (more…)
Tags: boost, Dual Rectifier, pedal
Update: This is the final version of the DR Booster:
The R10 is actually a pot, not a resistor. With R10 at 10k, the boost is 19.1 dB; At 0 it is 3.5 dB. The frequency band is 33 Hz – 2.9 kHz, with 330 Hz as the center. (more…)