OP-Amp replacements question (TL074CN, NE5532N)

[Stolenchild]

Hi guys,

does anybody have a good idea for replacing TL074CN and/or NE5532N OP-Amps?

I have an old Rocktron RSB18 (built in 1989) guitar effects looping system which I favour over products because of the many features built to this unit. The problem is that is has a relative high ground noise level which I would like to lower.
In each loop there is one TL074CN and a NE5532 for amplifying signals. The noise rises the more loops are activated.

I have been reading some articles on such subjects and the more I read the more I get confused if there is a suitable replacement possible.
When I replace with higher current op-amps i blow my power supply. But those with higher current consumption have faster slew rates which are good for sonic transparency.
As I am no electronic engineer this is above me. Has anybody some suggestions where I can learn more about such issues?
I built myself an Gyraf1176 which works fine so I can solder if I am told which part needs to be where.

Or can't such things be answered generally?

Thanx in advance,
S

 

[pstamler]

[quote author="Stolenchild"]I have an old Rocktron RSB18 (built in 1989) guitar effects looping system which I favour over products because of the many features built to this unit. The problem is that is has a relative high ground noise level which I would like to lower.
In each loop there is one TL074CN and a NE5532 for amplifying signals. The noise rises the more loops are activated.

I have been reading some articles on such subjects and the more I read the more I get confused if there is a suitable replacement possible.
When I replace with higher current op-amps i blow my power supply. But those with higher current consumption have faster slew rates which are good for sonic transparency.

(snip)

Or can't such things be answered generally?[/quote]

For the most part, they can't. In this example, it may well be that the noise in the circuits is coming from elements other than the opamps, in which case replacing the opamps won't help any, and may cause other problems. And in all likelihood higher slew rates won't increase the transparency of your particular circuits, since the TL07x and NE5532 have fairly decent slew rates. They have other problems, but most likely their slew rates are fast enough for the application.

But I don't really know, and I can't know without seeing a schematic of the unit you're trying to upgrade. Context, in this case, is everything.

Peace,
Paul