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EH Electric Mistress sounds thin

12/1/1997 10:47 AM
Anders Westerberg
EH Electric Mistress sounds thin
I've just fixed a broken EH Electric Mistress equipped with a SAD1024 (see earlier posting) and the effect seems to work well, but the owner thinks it sounds a little bit thin and "metallic" compared to his other Electric Mistress (with MN3005).  
However, I've checked all caps in the signal chain but I just can't find anything wrong. Is it likely that the two models sound different themselves? As I understand, the MN3005-model is the later model, right?  
All comments welcome.  
12/1/1997 11:08 AM
CJ Landry

That's a tough one Anders. I get the same responses on certain repairs and sometimes there is no real good answer.  
My reply would be to try your best to compare the repaired EM with SAD1024's to another working EM with SAD1024's. That is if you feel confidant that the pedal is working good. I have taken pedals back and worked for hours trying to solve a problem where I am not sure a problem exists. You have to learn that there is a point where you just say enough is enough and call it a repair or a loss! I have repaired items and just to do the right thing and please my customer they got it free! I hate doing it but sometimes that is the best answer. So the old addage, You live and learn!!!  
( Whoa, let me get back on track)  
Unfortunatley, there was no checkout procedure from EH that I know of that will assist in fine tuning the pedal. I go on my circuit analysis experience and what I think a good flanger ( in this case) should sound like.  
Hoped that helps,  
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12/1/1997 12:47 PM

I have a conjecture, but you won't like it. I have a lot of SAD1024's. I started out testing every one until I found that the defect rate was about 2 out of every hundred, so I stopped testing and just started replacing any that anyone was not happy with.  
In the testing, I found some 1024's that seemed partly-good; that is, they did a delay, but only a fraction of the delay that I expected. This was the case on one Electric Mistress I fixed, so maybe it is the same problem. Some of them just don't delay as long, perhaps with a failure of some inner short that doesn't fully kill it.  
It's a guess...  
I've said this before, but I'll repeat it - the SAD1024 was OK for it's time, and it's definitely what you want for repairs, but it's not robust, and all new designs should be done around the Panasonic devices.
12/1/1997 4:40 PM
CJ Landry

I started working on a replacement BBD circuit using an A/D, 6264 memory chip, and a D/A. I wired it all up along with a 4538 and it did not work!! It did not work only because I did not have enough time to debug my bread board. One of these days I am going to perfect that circuit and make it a drop in, SMT device so we won't all have to be dependant on these BBD's.  
12/2/1997 7:56 AM

Sounds great, more reliable than the older MOS technology.  
Can the finished cost be made less than the cost of an SAD1024, currently $11 to $36, depending on where you get them?
12/2/1997 9:57 AM
CJ Landry

Well of course not!! You can't have your cake and eat it too R.G.. No really, That is the draw back. You are probably looking at somewhere in the nieghborhood of $25 to $30. Prices on 10 bit D/A's are expensive $15 and up; at least the one's I looked at.  
However, it could replace all of the BBD's that are no longer available like SAD512, R5106, R5107, and SAD4096 which is getting hard to find.  
I did see where prairie has SAD4096's.  
12/2/1997 3:46 PM
Bummer. I was hoping that some new chips had come along that made this easy.
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