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Ampeg Scrambler


 
5/28/1999 12:55 PM
roger
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Ampeg Scrambler
I've been trying to troubleshoot a Scrambler from a Keen Toner Transfer package with no luck.  
 
I do not get 4v on the darlingtons at the output. I get nothing. I do get 8.2v on the emitters like I'm supposed to, but no voltage on the collectors. I've checked for shorts and haven't found anything. I've replaced the MPS-A13s and that hasn't helped.
 
5/28/1999 5:04 PM
R.G.
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I'd be happy to help you with that by email. Measure the DC voltages of  
(a) the battery terminals  
(b) the battery voltage *on the circuit board*  
(c) each pin on each transistor  
 
and email the voltages. This turns up most problems immediately.
 
 
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5/28/1999 7:23 PM
moocow
R.G.,  
 
Would it be a good idea to include the nominal DC voltages on your schematics ? Fender still does this on their tube amp schematics, and I bet it would help a lot of people with their troubleshooting.
 
5/28/1999 8:47 PM
R.G.
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Yes, I've been doing that as I go through updates on the documents. There's about 20 packages now, and it keeps me hopping.
 
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