[sdiy] LF444 vs. NTE859?

[anthony]

In that application it should work OK, but try cross-reffing ANY quad BiFET 
amp: TL0X4 for example (at least TL074, TL084 & TL064 if not the whole TL0 
series), many LF series or just about any other even with significantly 
varying spec's and it'll show you the NTE859. This is true for the singles 
and doubles (whatever NTE numbers corresponding to them, which I can't 
recall offhand...)

It's hard to say if the NTE859 is an improvement over lesser opamps and a 
comromise for better opamps. I dunno, I haven't used enough of the NTE parts 
to compare them. I do know that many of them are simply relable jobs, 
easilly observable by scraping or simply looking past the whited-on NTE 
number. I don't think every single part is a relabel job, but I do know that 
every single one from the RCA CAXXXX series that I bought (CA3080E, CA3080H, 
CA3140 and some others I forget...was a relabel, except maybe for the can 
ones (CA902?). When their lifetime buy supply ran out a year or so ago (for 
the CA3080), there were osoleted. You can still get them elsewhere - and 
probably for a lot cheaper...

But the issue at hand is opamps. I think people should approach the use of 
the NTE859 in critical circuits with caution, and to definitely report 
rsults here for the rest of us. An A/B comparison with a number of the 
actual opamps that the NTE859 is supposed to cross with would be a good 
project. Battery life in Ray Wilson's Soundlab would be a great test. Since 
long battery life is one of the plusses that may sway one to favor the LF444 
over other similar amps.

The only other thing I can think of is I'm sure you can get an actual LF444 
for a lot less than an NTE859.

AA

> Can anyone give a reason that I can't substitute an NTE859 -- data  sheet 
> here: http://www.nteinc.com/specs/800to899/pdf/nte859.pdf
>
> for an LF444 --  data sheet here:
>
> http://www.alldatasheet.com/datasheet-pdf/pdf/8580/NSC/LF444.html?
>
>  in one of Ray Wilson's sample and hold modules:
>
> http://www.musicfromouterspace.com/analogsynth/SMPLANDHOLD200607/ 
> SMPLANDHOLD200607.php
>
> Thanks in advance,
>
> Sam E.
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