Op-Amp Substitution

Mighty unusual to find one in a audio desk.

I would put an 8 pin DIL socket in the PCB for safety.

.... Phil

Audio or video ???

.... Phil

Audio.

That is a given.

JRC used to make them under licence from Signetics.

The numbers on the pack may be poorly printed or worn after 30 years.

Using an op-amp with the part number you supplied in an audio desk is non credible.

.... Phil

RC 5023 op amp.  It is dead-shorted - so I know it is bad. The rest of th e board, diodes and transistors check OK.

p amps in stock.

p, the 356 seems to be 'more so'.

(1980s vintage), waiting to get the parts from Mouser (Not in stock) or New ark, Digikey and so forth is easy enough but for the time constraint.

ggle a bit at ICs, so thanks in advance for any suggestions.

I didn't know SONY made kitchen appliances.

Phil:

Peter Wieck Melrose Park, PA

Well, if it's really a single-unit op amp (eight pins, with output on pin #6), there's lots of substitutions, including LM356, that might work.

JRC (Japan Radio Corp) usually uses NJMnnnn part numbers, and their low-noise audio single op amp that's most likely is NJM5534 (which has already been suggested). If there's a JRC5023 marking, it's possibly a house-numbered part (in mass production, it's common to deliver chips with markings specific to a customer).

JRC 5023 op amp. It is dead-shorted - so I know it is bad. The rest of th e board, diodes and transistors check OK.

#6), there's lots

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All of which makes perfect sense - except that there is a 5023 part number made by various makers that is listed as a direct substitution.

In any case, I will purchase a couple of sockets and drop in the jfet units that I have and report back. For the record, during my research into this a little bit, the JRC5023 was pretty much reviled by those who favor this m ixer - and although the same 4-digit part number was often suggested, it wa s always by a different maker.

Thank you all for your replies - I was not trying to raise any controversy, just ask a simple question. So far, I have gotten a 'might' and a 'possib le'. Good enough to see if it will suit the need for the moment. Meanwhile , I will order the correct parts should the 356 fail in practice.

Peter Wieck Melrose Park, PA

These are low noise, low impedance devices and the LF356 is not.

For the record, during my research into this a little bit, the JRC5023 was pretty much reviled by those who favor this mixer - and although the same

** Horse poo.

The 5023 op-amp is an RF type that has no place being used in an audio mixer.

How surprising !!!

You supplied us NO info on what purpose the op-amp was being used for or even what Sony desk it was.

I see age has not made you any wiser, Peter.

You are still the same s*it head you always were.

... Phil

Long time since I've seen a post from you, Peter. :)

amps in stock.

the 356 seems to be 'more so'.

(1980s vintage), waiting to get the parts from Mouser (Not in stock) or Newark, Digikey and so forth is easy enough but for the time constraint.

a bit at ICs, so thanks in advance for any suggestions.

Why would they use a video amp for audio? You are referencing a RCA/Intersil/Harris/Intersil number which has nothing to do with a JRC numbered part.

Does the schematic match the pinout of the FET Opamp? How is it used? As an amp, or part of a filter? It should work in most circuits, as long as the original part isn't a current amp.

Opamps are just blocks of gain. Their gain is set with resistors, so the exact Opamp isn't critcal. The supply voltage, noise figure & DC offset are. A 30 year old Opamp doesn't have much to brag about when it comes to noise figure or offset. The only other problem is driving a high capacitance load which can make it unstable.

I have used the LF373 dual version to replace older dual bipolar Opamps with no real problems.

What is the model number of the mixer? I should be able to get the actual Sony part number and provide a sub.

Dan