Author Topic: Tone Stack Calculator (Read 167 times)

tcube · « **on:** November 07, 2011, 02:47:42 PM »

I found out about a nifty piece of software from an old forum post. It tells you how the bass, mid, & treble controls on a variety of amps affects the frequency response (http://www.duncanamps.com/tsc/). Among the amps represented is the Fender which is essentially the Alembic F1X circuitry if the values of capacitors #2 and #3 are changed to the Alembic's values.

So, my question: What are the values for C2 and C3 for the F1X? I looked up the values on the info sheet for the F2B, but the value for C2 is hard to interpret. There isn't a comparable sheet for the F1X that I know of.

Even if you use the default values for the Fender amp, it does behave as you'd expect given the various posts on our forum: 2/10/2 (b/m/t) gives you a fairly flat response; 5/5/5 gives you a mid-scooped response.

David Houck · « **Reply #1 on:** November 07, 2011, 08:01:10 PM »

From a previous post:

Zsrc = 38k
R1 = 100k
C1 = 250p
C2 = 47n
C3 = 100n
R2 = 250k
R3 = 250k
R4 = 10k
R5 = 1M

David Houck · « **Reply #2 on:** November 07, 2011, 08:10:33 PM »

From another previous post:

When you first run the TSC, click on the Fender tab. Next you need to make two changes:

Double click on C2 and change its value from 100 to 47.

Double click on C3 and change its value from 47 to 100.

tcube · « **Reply #3 on:** November 07, 2011, 10:05:51 PM »

Hi Dave, and thank you. This was what I first thought, but when I looked at the values for the F2B, which I thought was a two-ch version of the F1X, I saw some different values. Anyway, your answer clarifies everything thanks!