LTSpice, guitar amp tone control
On 20.02.2014 09:33, Patrick Turner wrote:
Hi all. At 66yo, I have automatically been granted the license to be a GRUMPY OLD MAN, acronym GOM, aka Experienced Curmudgeon or EC.
SNIP
So, by having a Mid tone control one is drawn to effectively making a 3 band graphic equalizer. It confuses many musos. Depends a bit on what kind of venue and audience they play to. Perceived loudness of different F varies with general average loudness and there's a famous graph which sums it up in Radiotron Designer's Handbook, 1955, written by wise old men.
The Q of the 3 wanted bands differ; one would seem to want a higher Q for mids. Well, to get that, perhaps the easier way for tone control is to do a simple bass & teble Baxandal, and then in a preceding or following gain tube connect a series resonant LC circuit and pot between cathode and 0V. Thus it is not too hard to get +/- 9dB at 400Hz, Q = 1 or 2, while having it non-interactive with the bass and treble controls. 100uF and 1.6mH become resonant at 400Hz, and
L can be air cored.
Just my 2c,
Patrick Turner.
Hi Patrick,
are you reinventing the SVT/V9 Preamp from Ampeg?
regads
Jochen
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