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Old 22nd February 2017, 02:38 PM   #121
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Quote:
Originally Posted by LLPe View Post
Besides, the 4558 is not so bad as some make it out to be. I've used in a RIAA (three 20dB gain stages, active) , and must admit I was surpriced how well it sounded.
That was to be hoped. Plenty of home hi-fi manufacturers have implemented single-stage RIAAs using 4558s that in general tend to be perfectly serviceable. A standard active RIAA requires a GBW of no more than about 200 kHz, there's no other way it would even have worked using just two vacuum tubes or transistors per channel.
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Originally Posted by LLPe View Post
For audio the LM358 takes cake. But then again, it was never intended for audio use.
Agreed. You can kinda-sorta make it work by applying several mA of class A bias to the output stage, at which point it's "just" very noisy.

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Originally Posted by LLPe View Post
On the MC33078/LM833:
Go to TI's homepage and find the datasheets or these devices, print them out.
Take the first of each, put one on top of the other and hold them up against a bright light. Apart from the names, do you see any differens? No ?
Now try with page 2. And 3 and 4... 24.

QED: TI regards these two as identical. Which one of the original designs was chosen is anyones guess, no schematics is revealed.
Actually you can even find two different LM833s, the other one is the "N" part. One of them is the NatSemi part using a complementary output stage (with one side being pretty weak in terms of current), the other one is TI's rebrand of their MC33078 with the quasicomp output stage.
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Old 22nd February 2017, 05:33 PM   #122
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Originally Posted by nigel pearson View Post
I read the other day MC33078 and LM833 are related. From memory this seems unlikely. Motorola talk about both in some engineering notes and seem to say same familly and 33078 better.
Quote:
Originally Posted by LLPe View Post
On the MC33078/LM833:
Go to TI's homepage and find the datasheets or these devices, print them out.
Take the first of each, put one on top of the other and hold them up against a bright light. Apart from the names, do you see any differens? No ?
Now try with page 2. And 3 and 4... 24.

QED: TI regards these two as identical. Which one of the original designs was chosen is anyones guess, no schematics is revealed.
And now, what about these? Are they any good?

Best regards!
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Old 23rd February 2017, 12:59 PM   #123
LLPe is offline LLPe  Denmark
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I think so, I've tried both in RIAA amps (not single stage, at least two stages).
The MC33078 is easier to work with, it's not quite so temperamental as the LM833.
One rule for the LM833: never -ever present it with a capacitive load.
And one for the MC33078: don't load it hard, keep load below 10mA, or better still 5mA.
Finally, they are cheap, around 0.8$.

Have a nice day
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Old 23rd February 2017, 08:27 PM   #124
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Originally Posted by Kay Pirinha View Post
And now, what about these? Are they any good?

Best regards!
See this about the MC33078
Opamp survey
I'm using ST33078 and I'm very happy with the sound. Newark listed them as "low noise" and had them on sale at $.37 for dip package. I'm using one for RIAA 50x gain on mm cartridge, the next after the mixer resistors to drive a 4 m RCA plug cable. Very much quieter hiss than NJM4558 at 50x gain. Sounds better than my PAS2 preamp at this point.
The 33078 slew rate is so fast, I had to install a .1 uf capacitor between the PS rails between the two packages, and a 33 pf disk capacitor around each feedback resistor. Before that it was oscillating at ~1 mhz. The mixer didn't need those using 4558. Also, hum was supressed by putting a 330 ohm resistor between e-cap and 4558 op amps. I took that out and went to a triple pi filter with wall transformer outside the steel case, to get rid of the hum.
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Last edited by indianajo; 23rd February 2017 at 08:30 PM.
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Old 20th April 2017, 12:18 AM   #125
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Question 4558 OP amp

Recently I Re Caped My Bose 901 Series IV Equalizer because of a non Sounding Channel. Replaced the Caps With Audio Grade Nichicon Caps and Replaced both the Factory LF353N because one was bad with 4558 . the first thing I notice was that to get a decent bass from my 901's I have to put all the way up the bass slider on the EQ. reading the comments here about the 4558's I think somebody has a better replacement for them. can someone help me make the EQ sound like it should? Thanks
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Old 20th April 2017, 12:29 AM   #126
kevinkr is offline kevinkr  United States
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Sorry LF353 and 4558 are not interchangeable, one is fet and one is bipolar. Totally inappropriate choice. The Bose EQ was designed for the much higher input impedances of the LF353. You could try OPA2132 or OPA2134 either of which would be much better choices. (Even TL072 or one of its more modern cousins would be a better choice.)
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Old 20th April 2017, 10:06 AM   #127
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Isn't the original LF353N any more available? A quick research at Mouser's lists it for just € 0.472 for quantities up to 9 and € 0.397 up to 99. So, where's the real problem?

Best regards!
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Old 21st April 2017, 04:34 AM   #128
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Thanks for the Info,already sent for some OPA2132.will post results as soon they arrive.
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Old 21st April 2017, 05:24 AM   #129
ammel68 is offline ammel68  United States
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Quote:
Originally Posted by Kay Pirinha View Post
Isn't the original LF353N any more available? A quick research at Mouser's lists it for just 0.472 for quantities up to 9 and 0.397 up to 99. So, where's the real problem?

Best regards!
There's no "real problem" for the LF353N. National was bought out by T.I. a while back. This is old news.
Just wait until Mouser gets more stock on T.I.'s version of the National LF353 and purchase all your heart desires if it's something you want to try.
http://www.mouser.com/ProductDetail/...%2fy0ICs1BI%3d
SQ of the LF353N(dual) and the LF356N(single) are fair at best.
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