NE5534N versus NE5534NG?

[inverseroom]

Thank you! I won't worry about the digital chip then, and will try out replacing the 5534's.

[brianroth]

Most British style consoles run at 17 volts, some at 18 but once the rails get through the fusing resistors it drops about 1/2 volt. If you run at 22 volts use the LME49870 single opamp. For a dual use the LME49860 which also is rated at 22 volts power rails. No need for those NG 553x opamps anymore. The Nationals don't output as much current but do drive 600 ohm loads. For output drivers the LM6171 single or the LM6172 dual are great choices, they output 100 ma and will drive 50 ohm loads.

The 5534/2 was released in 1976. It's about time we moved on.

When I mentioned +/- 20V rails, I was thinking of the Trident 80B (and possibly the 80C, and/or the TSM). There are no fusing resistors, so it's no small wonder those desks tend to eat TL071 opamps!

Bri

[Jim Williams]

It's another reason to replace older opamps that don't have as good a PSRR spec, all those connected via power supply opamps can talk to each other. Module crosstalk can be improved by isolating the power supply from each ajacent module. This is why isolation resistors, diodes, regulators have all been tried.

[brianroth]

But, Jim....you're "dissing" some revered desks, the Trident 80B, etc!

<G>

Bri

[Jim Williams]

No, not at all, I love working on them. They just are not known for super wide imaging. Not a problem as the music people favor to record on them is mostly mono anyway.

They seem to have a certain amount and flavor of dirt many find appealing.
They sure sound more musical than any digital mix platform. At least the harmonics are related to the fundamental, unlike digital which is bounced off the clock frequencies.

I did learn to try and only use one of the mid EQ bands as they interact.

[inverseroom]

First, the 5534 is a single device, the 5532 is a dual device. These should not ever be confused unless you want to let the smoke out. The LME49710 is a single device, a replacement for the 5534. The 5532 replacement is the LM4562. It's a pretty safe drop in, but I would still examine the output pins on a scope for stray oscillations as these are 55 mhz devices compared to 10 mhz for the 5534/2. Local power supply .1 uf bypass caps on the power rails is usually needed and of course, a small cap across each feedback resistor for phase stability.

Another choice for the duals is the AD8599 mounted on a Brown Dog or Aries adaptor. This is a 15 mhz part with closer bandwidth specs to the 5532/4 but has very low 1 nv/hz/sq noise spec.

Another choice for the singles is the BurrBrown OPA211 which is another 1 nv noise spec part, S08 only so it also needs the adaptor.

Just a quick update here...I got 4 LM4562's from Digikey and dropped them in as replacements for the 5532's in the pres on my Hill. No problems whatsoever. They did indeed cut the noise floor on each channel by a fraction of a db or so, so over the whole board that might well mean something real. As far as passing actual music through the things, I can't detect a difference, but maybe I will in the coming months. At the very least, the Nationals are doing their job right.

[ubertar]

Any good replacements for the 5533? For some reason these are a lot harder to find. It's the dual version of 5534.

[Jim Williams]

5533??? Are they not 5532? That's a dual 5534, use the LM4562 as the replacement. Never heard of a 5533 before.

[ubertar]

5533??? Are they not 5532? That's a dual 5534, use the LM4562 as the replacement. Never heard of a 5533 before.

Philips Semiconductors Linear Products Product specification Dual and single low noise op amp NE5533/5533A/ NE/SA/SE5534/5534A DESCRIPTION The 5533/5534 are dual and single high-performance low noise operational amplifiers. Compared to other operational amplifiers, such as TL083, they show better noise performance, improved output drive capability and considerably higher small-signal and power bandwidths.

5533 is the dual version of 5534. 5532 is similar, but different. It's also a lot more common than the 5533 for some reason, so it's a common misconception that it's a dual 5534.

[Jim Williams]

That was long ago. Arn't those 14 pin jobs? I don't believe they are made any more. Sort of like re-fitting a 709 opamp.

[ubertar]

That was long ago. Arn't those 14 pin jobs? I don't believe they are made any more. Sort of like re-fitting a 709 opamp.

Yeah, they're weird. Oh well. They sound good, but it'd be nice to try some other flavors. They're what's in the ATI m-1000 preamps.