Tone Stack Calculator For Mac
The 27k NFB resistor and 5K presence pot form a voltage divider for the NFB signal so cutting the presence resistance in half also cuts the NFB signal voltage in half which would thicken the clean tone and slow the already lazy transition from clean to dirty tone. This circuit change makes the difference in negative feedback levels between the 5F6A and the Marshall JTM45 even greater. The JTM45 has 2.8 times more negative feedback than the original 5F6A but has 5.6 times more NFB than a 5F6A with the 4.7k resistor across the Presence pot. Is another Late Semi-Active Tone Control The Resonance Control does for low frequencies what the Presence Control does for highs. The Resonance Control blocks the flow of low frequencies in the negative feedback circuit. Blocking low frequencies from the NFB circuit acts to boost those low frequencies at the speaker.
The feel and tone is totally different, but gain loss is what makes a passive tone stack work. This is a good LEARNING tool, and is fun even for veterans like myself to play around with, but in the end, everything needs to be dialed-in by ear and feel. Aug 01, 2014 I'm trying to find some graphs or depictions of how the EQ controls work on a typical Marshall Plexi. In my mind, I'm trying to depict the curve changing as the various knobs are turned.
The phase inverter balance pot (PI BAL 10K linear pot) is shown at center. Adding imbalance between the power tubes increases sweet sounding second order harmonic and intermodulation distortion.
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If you have not been trained to work with high voltage then have an amp technician service your amp. Never touch the amplifier chassis with one hand while probing with the other hand because a lethal shock can run between your arms through your heart. Use just one hand when working on a powered amp. The following voicing techniques are listed from early to late in the amplifier circuit: Table of Contents Don't forget about the earliest possible place to shape the guitar tone is on the guitar itself. Adjusting the guitar's tone control will affect the guitar audio signal's tone through the entire amplifier.
This tends to make an amp sound more round and tubey and less sterile. A smaller output transformer can help a modern amp sound more vintage. Most high gain amps do not use undersized transformers. A 'right sized' or oversized output transformer will let you get the maximum volume out of your amp and enhance dynamics, especially the low end. The amp's speaker has more affect on the amp's tone than any other component and a swap is usually an easy job. The problem is unless your amp is a known standard you never know quite what the amp will sound like with a new speaker until you try it.
This will never occur in the real amp and guitar. Also, turning the bass up, shows response down to 10Hz. The factors listed above will severely limit that. Of course the bass E string is around 80Hz, so response below that is superfluous (except for those drop D players of course ). So, in the case of the HR Deville (410) is it the same Marshall tone stack??? I am only guessing yes because of the extremely low mids. It quacks slightly when mids are turned up, but it doesn't border the same mid boost as say a Wah.
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The Resonance Control, like the Presence Control above, affects only the phase inverter and power tubes. Resonance Control blocks low frequencies from the negative feedback signal to boost low frequency output, add low freq harmonic distortion (add some hair) and loosen the bass response. As you turn the control clockwise (up) the wiper moves in the direction of the arrow on the schematic. This is a subtle, v ery late tone tweak that can be temporarily clipped o nto the negative feedback resistor to tweak to taste.
Once published, I will add a signal processor. This will allow the user to play into the mic, change the tone control and send the results to their PC speakers. This will be a very ambitious project.
The #1 Input Hi Jack is at upper left, the #2 Low Jack (-6dB) is on the right. R1 is a 1M input resistor and set's the amp's input impedance to 1 megaohm. R2 and R3 are 68k Grid Stopper resistors that remove frequencies above human hearing and also act as mixing resistors to prevent two instruments plugged in simultaneously from interacting with one another. For amps with Fender style 'High and Low' input jacks the Low jack not only cuts the guitar signal in half (-6dB) but it also offers up a very different input impedance (136k Low vs 1M High) which can interact with the guitar pickup coils to color the tone.
For more information on the TMB tone stack see. If you are considering modifying the tone stack I recommend you download the free so you can see graphically what the modifications do and how the Treble and Bass pots will react to the new component values. Duncan Amps Tone Stack Calculator After installing the Tone Stack Calculator, click on the Tone Stack Calculator's 'Fender' tab at upper left. By setting the Mid slider (bottom left) to 68% you get 6800 ohms to equal the Deluxe Reverb's fixed 6800 ohm Mid resistor. You can double-click any component in the tone stack schematic to change its value so it's easy to see what happens to the control movements when you change the 100k slope resistor to 56k or adjust the value of the Mid resistor. The frequency response graph on the right will change as you alter component values or move the Bass and Treble pot sliders (at bottom left).
A lower value Tone Slope resistor will give you more maximum bass and less maximum treble. A higher value will give you more maximum treble and less maximum bass. High gain amps typically use a higher value tone slope to help reduce bass freqs that can cause muddy overdrive lows and blocking distortion. A higher value tone slope resistor will also lighten the impedance load of the tone stack and therefore boost gain. 100k Tone Slope resistor on the left, 56k on the right. The effect is subtle but some prefer the 56k slope. Notice how the mid scoop is wider and the max bass and treble are balanced on the right with the 56k slope resistor.
The VOX Cut Control connects the power tube grids with a 250k audio pot and 4.7nF (.0047uF, 200v or higher) capacitor to allow variable high end cut. In a push-pull amp the guitar audio signals on the two power tube grids are 180 degrees out of phase with one another so mixing the two signals together nullifies the signal. I'm a big fan of this very late tone tweak because it pairs well with an early tone control or stack. Use the early tone control to get the overdrive tone and substance you want then use the Cut Control to fine tune the tone and trim fizz and ice pick highs. The Cut Control affects only the power tubes. Wire the cut pot as a variable resistor so that as you turn the knob up (clockwise) resistance increases. Up = more resistance = brighter tone.
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Megantz, Design and Construction of Tube Guitar Amplifiers Neumann & Irving, Guitar Amplifier Overdrive, A Visual Tour It's fairly technical but it's the only book written specifically about guitar amplifier overdrive. It includes many graphs to help make the material easier to understand. Rutt, [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ Amp Voicing ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ].
For our voltage above we get: 100v * 500,000 / (500,000 + 500,000) = 100v *.5 = 50 volts out. The R2 / (R1 + R2) determines the ratio of the upper to lower resistor. If you make the lower resistor smaller more voltage will be bled to ground so you will have less voltage out.
This is a great way to cure ice pick highs and reduce overdrive fizz. The cap allows high frequencies to go around the negative feedback resistor which reduces high freqs at the speaker. In other words more high frequency NFB is added. The cap can be anything from 47pF up to 500pF. The cap size affects the roll off frequency but not the amount or volume of highs. You can add a resistor in series with the cap to reduce the volume of high freqs that pass through the cap. The Ice Pick Cap affects only the phase inverter and power tubes.
• The inductance of the pickup and line/amp capacitance also serves as a second order (12dB per octave) high frequency roll-off. • The negative feedback of the amplifier usually has a low pass filter which works as a presence control. That results in more high frequency gain. • The transformer and the speaker will have a low frequency limit due to their inductance. • The loudspeaker by nature has a second order (12dB per octave) high frequency roll-off. • An open back speaker cabinet is a dipole and will limit the low frequencies as well. For instance, with the treble turned up on the tone stack application, you get response out to 20kHz.
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Many 1950's guitar tube amps sound most authentic when paired with a speaker with relatively low efficiency around 95dB. If you want more breakup at lower volume a low efficiency speaker will let you turn your amp up more for the same output volume.
The factors listed above will severely limit that. Of course the bass E string is around 80Hz, so response below that is superfluous (except for those drop D players of course ). Click to expand.I agree with Terry 100%. As you become more experienced with amp mods and design, you will often find that the tone stack is the LAST place where most amps need work. It only seems that way initially because the tone stack is perceived as the tonal nerve center in the amp.
Not only are the low freqs boosted but they become 'harrier' with added harmonic distortion with the reduction of NFB and the bass response also becomes audibly 'looser'. Use the Resonance Control to subtly tweak your amp's low end. You can also thicken up your clean tone by turning up the resonance control to add low frequency harmonics. As a general rule the harder you push an amp the lower the resonance control should be set.
Free Calculator For Mac
A late-in-the-circuit tone control like the Presence Control or can usually remove the fizz and ice pick without killing the overdrive tone's fullness and sparkle. You can also thicken up your clean tone by turning up the presence control to add high frequency harmonics. As a general rule the harder you push an amp the lower the presence control should be set. The Presence Control affects only the phase inverter and power tubes.
Tone Stack Calculator For Mac Os X
I previously published an Excel spreadsheet that displays a graphic that shows you the signal from the microphone inputs. Basically, I need to move the code to the Tone Stack Calculator.
The larger the resistor the less negative feedback gets through to the grid. This is a pretty cool yet extremely simple circuit that should be experimented with in all high gain preamps. The standard is a series of three CR (capacitance-resistance ) high pass audio filters and one RC (resistance-capacitance) low pass audio filter that block three bands of audio frequencies.
The only complication is explaining how to combine the output values. Therefore, I supply the series and parallel math routines and explain how to calculate the various resistor values. The software will have circuit diagrams and allow users to change values. Storing changes is not possible at this time.