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Discussion in 'Amp Tech Center' started by DennisM, Oct 14, 2017.
The .0047 on the tone pot to ground. What does it do? Does it affect tone?
Yes it affects tone
From Rob's site
The tone pot in combination with the tone capacitor create a variable RC (resistance capacitance) low pass filter which removes high frequencies by shunting them to ground. Using a higher value tone cap will lower the cutoff frequency of the tone control so it will affect more mid frequencies. Reducing it will raise the cutoff frequency and affect less mid freqs.
Just to clarify a little, the .0047uF or .005uF cap is the tone cap which works with the tone pot to remove high frequencies.
The smaller .0005uF (500pF) cap on the tone pot is the bright cap and allows high freqs to flow around the bright volume pot.
Yes, and this in turn affects the 5E3's tone pot's influence on the drive characteristics of the amp. Here is a link to an explanation and recommendation that I found extremely helpful. I reduced the value as recommended here several years ago, and have been happy with the results.
Yep. I think mine is 700pf.
I don't have a 5E3 but If I were to build one, I'd try a 1200pF-2200pF there (1.2n-2.2n)
Smaller cap = higher treble cutoff freq which = less highs cut with smaller value. The cutoff is less sharp with the smaller caps so, to me, it has more of a 'warming' effect to the tone, rather than muddying it up.
This mod is excellent in a 5E3, especially at lower settings. The 5E3 has an additional bit of gain on tap with the tone knob higher than 6 or 7, but the trade off for that additional gain is that the amp gets pretty bright. The change in cap value allows you to wick up the tone knob, and get the additional gain with the brightness under control. IMHO