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Question about super duper 2 in 1 cutting out

Started by plinio, September 22, 2011, 08:47:45 PM

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plinio

September 22, 2011, 08:47:45 PM
Disclaimer: If this thread is a violation of board rules please feel free to delete it.

I recently built a clone of a super duper 2 in 1 using this vero layout of the SHO.

http://tagboardeffects.blogspot.com/2010/07/zvex-super-hard-on-updated-version.html

It sounds great most of the time, but if I turn up both of the channels close to 10 it will cut out when I play the guitar loudly. For example, if I do a quick, hard palm muted stroke, it will make no sound for about 1/4 of a second, and then come back in.  There is no fizzling or crackling, it just goes silent.  The length of the silence is proportional to the strength of the guitar signal.  Quieter playing means a shorter silence.

Any ideas of what this could be?

Thanks

TimWaldvogel

#1
September 23, 2011, 02:07:58 AM
Perhaps your actually pushing your amp THAT loud to where it can't handle it so it maybe protects itself from any voltage overload on the input? I don't build amps idk. I would guess it's that or somethings up with the output capacitor leaking or something
YOU KNOW WHAT THEY SAY ABOUT LARGE PEDALBOARDS....

.... I BET YOU WISH YOUR PEDALBOARD WAS AS LARGE AS MINE

petemoore

#2
September 23, 2011, 07:27:09 AM
  Turn the amp or 2'n1 it isn't overdriven. Use audio probe to probe from the input to where signal is being lost, or signal injector from the output to find where signal is being lost, start from one end and work toward the other.
   Voltage measurements helps find if there's a bias issue.
   
Convention creates following, following creates convention.

plinio

#3
October 03, 2011, 12:52:00 PM
Aha!  I found in an old thread where in designing the super duper 2 in 1 he ran into the same problem and solved it by changing the frequency response:

Zachary Vex wrote:
"just in case anyone's wondering, the super-duper 2-in-1 has two super hard-ons inside of it. the second one has a master volume control that replaces the tie-down output resistor in a standard super hard-on, but when that master is turned up all the way, both channels are precisely the same as a super hard-on.

okay, that's a lie. there is one teeny-tiny difference. the super hard-on's input frequency response is 0.3 Hz to 100kHz. i was forced to limit the super duper's frequency response to 3Hz-100kHz because when i left all that near-DC response in there, the unit would nearly shut down and go silent for half a second with both gains cranked all the way if you hit a hard chord. but what's a couple of Hertz between friends?"

So my question for the pros is what can I do to change the input frequency response?  I am assuming that I should change the input capacitor to a lower value, but I am not sure how low to go.  Should I do this on both SHO circuits?

Thanks very much.
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