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December 22, 2014, 06:44:52 AM
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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Ampeg Scrambler - Which layout is right? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Ampeg Scrambler - Which layout is right?  (Read 2363 times)
azrael
Posts: 728



Ampeg Scrambler - Which layout is right?
« on: December 15, 2009, 09:11:22 PM »

Why are there two diodes on this layout:
http://ustomp.com/?p=9
and five on this one:
http://www.tonepad.com/getFileInfo.asp?id=31

Which is the correct Scrambler?
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PRR
Posts: 6235


Paul R. - Maine USA


Re: Ampeg Scrambler - Which layout is right?
« Reply #1 on: December 15, 2009, 09:49:30 PM »

Read the PDF on the TonePad site:

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azrael
Posts: 728



Re: Ampeg Scrambler - Which layout is right?
« Reply #2 on: December 16, 2009, 02:24:04 AM »

Oh, thanks for clearing that up. Missed that detail. I used the uStomp layout, so I was a bit worried haha.
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Jarno
Posts: 152


Re: Ampeg Scrambler - Which layout is right?
« Reply #3 on: December 16, 2009, 03:08:58 AM »

I put in all diodes, and it's wonderful, a very nice octave up. Didn't have any darlingtons, so I piggybacked BC560's. There's also a layout somewhere, which is meant to be used with 560's (two sets of holes in the place of each darlington). But I used the tonepad layout, and it worked on first startup (just some biasing issues, which is to be expected when subbing transistors).
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MikeH
Posts: 3087


Mike H - Ann Arbor, MI


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Re: Ampeg Scrambler - Which layout is right?
« Reply #4 on: December 16, 2009, 03:46:45 PM »

Honestly it doesn't sound that different with the extra diodes.  Sounds like doom either way.
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"Sounds like a Fab Metal to me." -DougH
PRR
Posts: 6235


Paul R. - Maine USA


Re: Ampeg Scrambler - Which layout is right?
« Reply #5 on: December 19, 2009, 05:50:49 PM »

> it doesn't sound that different with the extra diodes.

I can't see why either one is necessary. I wonder if they were left-over from a previous idea, or were over-cautious design. The pair should never do anything, the single looks like unnecessary protection. Like the breadboard was copied to a PCB, then in final testing it was realized that the diodes were probably doing nothing, a waste of 6 cents. In mass production, 6 cents matters. Easy enough to tell the workers to omit them, not worth burning a new PCB mask until the first mask wears out. Since this thing seems to be rare, they probably never wore-out the PCB mask.
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