SHO boost question .

[HOTTUBES]

I have built the Sho circuit many times and i have always liked how it sounds to a point ...

When you get the dial pot / Bias turned up passed half way it begins to add alot of low end .
Is there a way to keep that low freq. out at higher levels ?


Thanks for any help !!!

[Jazznoise]

It's an impedance thing, but I know what you mean - the neck pickup on my strat gets pretty hairy when it's cranked. Stupid amounts of low end. I stick to the midle or bridge when I'm using it.

Doesn't happen to my Jazzmaster, though. It's really down to the pickups. What guitar are you using?

[Gus]

The drain to gate resistor is both a bias and feedback part.  As the gain is turned up the input resistances goes down. What bias feedback resistors are you using 10meg, 10meg or?

It could be you are overdriving the amp and the EQ/tone is changing

OR it could be as simple as using a lower value input cap to move the highpass frequency up.

[HOTTUBES]

Lowering the input cap .... hmmm

What value would you try ?

[gjcamann]

Well lowering the input cap would help get rid of some low end at all gains. If you parallel a cap with the emitter resistor (i.e. pot) it will create a low impedance path for the higher frequencies so you'll get more boost with the higher frequencies (as opposed to cutting the low end). If you put a pot in series with this emitter cap you will be able to control the gain of the high frequencies independet of the overall gain. Now if you can find a great nipple switch and charge $200 for this pedal you can call it a Lovepedal.

Take a look at the AMZ Mosfet Boost http://www.muzique.com/schem/mosfet.htm You'll see this basic idea of controlling the curve of the gain with this cap.

Here's a Lovepedal example http://revolutiondeux.blogspot.com/2012/01/lovepedal-super-6.html 

I'm having a ton of fun these SHO/Lovepedal type circuits lately, it's amazing the sounds you can get with such a simple pedal.

[HOTTUBES]

Well lowering the input cap would help get rid of some low end at all gains. If you parallel a cap with the emitter resistor (i.e. pot) it will create a low impedance path for the higher frequencies so you'll get more boost with the higher frequencies (as opposed to cutting the low end). If you put a pot in series with this emitter cap you will be able to control the gain of the high frequencies independet of the overall gain. Now if you can find a great nipple switch and charge $200 for this pedal you can call it a Lovepedal.

Take a look at the AMZ Mosfet Boost http://www.muzique.com/schem/mosfet.htm You'll see this basic idea of controlling the curve of the gain with this cap.

Here's a Lovepedal example http://revolutiondeux.blogspot.com/2012/01/lovepedal-super-6.html 

I'm having a ton of fun these SHO/Lovepedal type circuits lately, it's amazing the sounds you can get with such a simple pedal.

Thank you !!!
I will tinker with your ideas and see what i can mess up ... Ha !!

[HOTTUBES]

 http://revolutiondeux.blogspot.com/2012/01/lovepedal-super-6.html 



So , is this just a SHO with a Volume & Gain control added ( sorta Kinda ? ) ?

[gjcamann]

http://revolutiondeux.blogspot.com/2012/01/lovepedal-super-6.html 



So , is this just a SHO with a Volume & Gain control added ( sorta Kinda ? ) ?

Ummmmm, Yeah!

Not much to those lovepedals, but they sure sound good.