[sdiy] NE570 drop-in replacement for NE571

[aankrom]

I have two DOD R-870's that have distortion problems that I think are 
related to the NE571's. I've ruled out the BBD's sort of because the 
distortion is there whether one BBD is on or both. It could be a BBD 
biasing problem though. Imagine trying to get the biasing right on an 
effect that runs the signal through an SAD512D then through an MN3005! 
It's a weird design, but it sounded awesome at one time. I know the 
MN3005 isn't the problem, but I can't run it with the SAD512D off 
(because it never is). If the SAD512D is the problem, I'll just wire 
around it I guess. What it sounds like is the expander section is wide 
open all the time or is tracking clock noise.

AA


On Mon, 23 Apr 2012 14:58:46 -0700 (PDT), Kyle Stephens wrote:
> I got my info here (I've a hard copy), though I reckon aankrom might
> already have a schematic to work from:
>
> 
> http://www.lulu.com/shop/thomas-henry/making-music-with-the-ne570-compander/paperback/product-3377724.html;jsessionid=A63ED4B9A962E7D58899AEF7B7D0DE74
>
>
> _Kyle
>
> --- On Mon, 4/23/12, Gergo Palatinszky <Gergo_Palatinszky at epam.com> 
> wrote:
>
>> From: Gergo Palatinszky <Gergo_Palatinszky at epam.com>
>> Subject: Re: [sdiy] NE570 drop-in replacement for NE571
>> To: "aankrom" <aankrom at bluemarble.net>, 
>> "synth-diy at dropmix.xs4all.nl" <synth-diy at dropmix.xs4all.nl>
>> Date: Monday, April 23, 2012, 2:23 PM
>> Hi,
>>
>> Shortly: YES (570 is better)
>>
>> One has tighter spec.:
>> 571: Gain cell distortion: Untrimmed/Trimmed   
>>       Typ: 0.5 / 0.1      Max:
>> 2.0 (%)
>> 570: Gain cell distortion: Untrimmed/Trimmed   
>>      Typ: 0.3 / 0.05 
>>    Max(untrimmed): 1.0 (%)
>>
>> you can use cool audio version v571 as well...
>>
>> Long: might you need different trimmer settings if you would
>> like to reach the best performance...(but this needed in
>> between two different 570s as well...   if
>> there is no trimmer ... move to short answer.
>>
>> For more scientific approach check manufacturer data sheets
>> deeply :O)
>>
>> br,
>> Pala
>> ________________________________________
>> Feladó: synth-diy-bounces at dropmix.xs4all.nl
>> [synth-diy-bounces at dropmix.xs4all.nl]
>> ; meghatalmazó: aankrom [aankrom at bluemarble.net]
>> Küldve: 2012. április 23. 22:05
>> To: synth-diy at dropmix.xs4all.nl
>> Tárgy: [sdiy] NE570 drop-in replacement for NE571
>>
>> I'm wondering if I can use an NE570 in place of an NE571
>> with no fuss
>> or muss.
>>
>> AA
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