"Superheated SHO" - asbestos gloves warning!

[frequencycentral]

"Superheated SHO" - asbestos gloves warning!

While messing with the basic SHO topology for another project another project I decided to add a switchable SSRP section lifted from the BSIAB. The resulting output signal is what I can only describe as superheated. Best to don your trusty asbestos gloves before laying down some uber hot licks and riffs into a tube amp with this sucker...........

[frequencycentral]

I actually prefer this version though, as it doesn't crackle. 

[MikeH]

Interesting- so it basically just switches between Mu Amp and err... regular?  Interesting; I can't believe no one has thought of that yet.  Does it sound "mini-booster-esque" while maintaining its "Mosfetty-goodness" in Mu Amp formation?

[frequencycentral]

Yeah - I invented the mini-booster didn't I? Go me!  :slap:

The superheated mode just gives more gain.

[therecordingart]

Yeah - I invented the mini-booster didn't I? Go me!  :slap:

The superheated mode just gives more gain.

This will help me with learning how to do a layout.

[Slade]

Nice, Rick. Now  the "SHO" is more like a Peppermill!
What changes in tone do you hear by changing the gate to drain capacitor?

[WGTP]

Very Cool Idea.  This adds some possibilities to the Twin Mu Amp format.  

I bet some bootiquer is already on it...

[RickL]

I love simple little projects like this. I put one together today on perfboard and good Lord is it loud! It's also noisy, but I'm guessing that it will be quieter once it's boxed.

Bravo!

[frequencycentral]

Finished it this morning.  I was at Radio Shacks door before they opened.
Ummm, I don'[t know a lot about DIY effects or guitar effects to boot, but I know that when I have my crappy little Crate practice amp at Vol 5, my SHO at Vol 5 and then I flip the switch for the 'Superheated SHO' . . . my pants get tight.

Freq', AWESOME addition to the SHO.  Perfect.

[/quote]

[WGTP]

  2 Brown Sounds in a Box...

[Lurco]

It seems the 2N5457 are getting scarce!

[neurino]

I was reading this

while noticed I have all parts at home so what best excuse for building one?

Then I found this topic and also have parts except the zener so... would a schematic like this work similarly?

(differences: 1.5M res and 1N4148 instead of zener)

Also I was thinking of get the 5K pot (reverse log, isn't it?) as explained at geofex even if I haven't managed yet how otherwise I'd switch to #2 with res and cap.

Any advice?

[frequencycentral]

You could use a red LED like the ROG Peppermill, or even a single 1n4148 between G and S should work. Lowering the 10M resistors to 1M will lower the input impedance. But yeah, the schematic will work.

[neurino]

Thank you, I'll try it, maybe looking for 10Meg resistors because looking at the Zvex presentation the 5Meg impedance is characteristic.

Thanks

P.S.: having trouble showing my schematic image... should by fixed now...

[earthtonesaudio]

Thank you, I'll try it, maybe looking for 10Meg resistors because looking at the Zvex presentation the 5Meg impedance is characteristic.

5M input impedance for AC signals is only realized at 0.53Hz, where the reactance of the input capacitor equals 2M, and provided the gain is set to unity to provide the maximum input resistance of about 3M.

For signal frequencies the input impedance is never much more than 3M, and falls as the gain is turned up.

[Quackzed]

? the many faces of.... mu-amps ? 
niiiiice!

[frequencycentral]

Here's a layout for the now re-christened Red Dwarf Boost, the PCB is available from guitarpcb.com: http://www.guitarpcb.com/apps/webstore/products/show/1656920

This is the crackle-less version, with the addition of a 1M pulldown. There's a soundclip at guitarpcb.com too.

[neurino]

I listened to the soundclip, it really gives a desperate amount of volume

I already imagine the guy at the mixer aiming at you with an axe: "turn that down!!!"

[fatfoohy]

I hate to resurrect  an old thread, but can someone tell me what the superheated section does? and how many volts it puts out?

[StereoKills]

Hey Rick, your layout for the Red Dwarf Boost is missing....