Modding a TS9 for more bass - what cap?

I´ve been thinkin about doing this mod on my mid 90´s TS9:

http://www.muzique.com/lab/fatt.htm

Sadly I´m completely lost when it comes to reading schematics. Does anyone know where in the board I will find the cap that I´m suppused to replace?

The .047 cap controls how much bass goes to drive stage. The original thought in limiting the signal in this way was to reduce the amount of buzz in the overdrive. You can change the value altogether, or - if you have room in the enclosure, install either a rotary or SPDT switch to change between two or more cap values. I have done this with my BYOC clone using the information at Beavis Audio. According to that page, the frequency is cut off at the following ranges for the associated value.

.047uf - 720

0.1uF - 339 Hz

0.22uF - 154 Hz

0.47uF - 72 Hz

1.0uF - 34 Hz

As you can see, a 1.0 cap would give you the best bass response, however - you will probably experience increased buzz in low end of the overdrive. Depending on the cipping diodes used, I find it's pretty negligible and with asymmetrical clipping stages, the increased buzz is far enough in the background.

I think it could be a nice mod to try out - its easly reversable if I dont like the result. The problem is that I dont know witch of the caps to change - where is it on the board? I believe I´ve seen some pix of the board with the cap marked but I cant find that pic now.

The caps should all have value markings that will tell you their capacitance.

It should say '473' somewhere in the code with other letters indicating the tolerance and voltage threshold of the cap. Probably either a 63 or 100v cap would be used. So, something like 2A473K

The caps should all have value markings that will tell you their capacitance.

It should say '473' somewhere in the code with other letters indicating the tolerance and voltage threshold of the cap. Probably either a 63 or 100v cap would be used. So, something like 2A473K

Thanks, but the prolem is that it´s already modded so the cap is a .1uf now (maked 103 if I remember correctly) and there are a few .1uf caps on the board (they all look the same). I got me a .22 and a .47 thet I wanna try.

Can you post a picture of the circuit board?

http://www.tonepad.com/images/photoessays/101.jpg

Lower left, the horizontal green object. :wink:

http://www.tonepad.com/images/photoessays/101.jpg

Lower left, the horizontal green object. :wink:

Thanks!!!:grin: