Surfmaster's coil waveform problem

[6666]

Probably LF357 are relabeled TL071, to long recovery time.
Here is mine, with OP37
[ATTACH]53270[/ATTACH]

Thanks for picture, I think most of my chips are fake, I have some OP37, have not tried them yet

[surfdetector]

Probably LF357 are relabeled TL071, to long recovery time.
Here is mine, with OP37
[ATTACH]53270[/ATTACH]

Vadim,
That is a really great picture especially with the captions. Very informative.

[Vadim18]

Thanks Surfdetector! I just have some time to work in Gimp )
Thanks 6666, just try ne5534 or better op37.
I think that in most cases 357 can be replaced by two cascaded TL071.

[6666]

Thanks Surfdetector! I just have some time to work in Gimp )
Thanks 6666, just try ne5534 or better op37.
I think that in most cases 357 can be replaced by two cascaded TL071.

Hi, if I can stay awake I might try my op37 op amp later today, I read some where that Qiaozhi said said he could see little or no difference in two stage preamp to single 357

[6666]

Thanks Surfdetector! I just have some time to work in Gimp )
Thanks 6666, just try ne5534 or better op37.
I think that in most cases 357 can be replaced by two cascaded TL071.

Been testing a few op amps, my "357" is slower than a 071,
yippie the op37 looks to be real and fast

[kt315]

Thanks Surfdetector! I just have some time to work in Gimp )
Thanks 6666, just try ne5534 or better op37.
I think that in most cases 357 can be replaced by two cascaded TL071.

use soviet made KR574UD1.