Debatable. The number is higher, yes. RC-980BX is way simpler (less = more) and can be modded with a few tricks. I always liked it better than RC-990BX, certainly after I had my way in it. It definitely is better than RC-870BX with line inputs. I don't know the phono preamp results.
BTW the naming convention is RC-xxxBX. I mean RC-980BX as it is called RC-980BX. Maybe we are discussing different devices?!
BTW the naming convention is RC-xxxBX. I mean RC-980BX as it is called RC-980BX. Maybe we are discussing different devices?!
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LC audio recommend the AD825 from Analoge Devices
http://www.octave-electronics.com/lcaudio/ad825.shtml
https://www.soundlabsgroup.com.au/c/LC-Audio.html
https://www.diyaudio.com/community/threads/ad825-module-from-lc-audio.4609/
The only place that an NE5534 works best is in a moving coil phono stage. The unique combination of input noise voltage and current matches the audio band impedance of a moving magnet cartridge perfectly, which maximises signal to noise ratio with a real cartridge (rather than a short circuit input). The much more recent OPA1621 comes close though.
But in non-phono stage applications there are many alternatives that are much more suitable. The TI Sound Plus range is certainly worth a browse.
But in non-phono stage applications there are many alternatives that are much more suitable. The TI Sound Plus range is certainly worth a browse.
thanks for all the help, I will leave the signetics in place, for future projects I will use Onsemi
I have an old Crown Straight Line One
Stereo Preamplifier (1978-79) it does have a few 5534, are those also Phillips ?
I have an old Crown Straight Line One
Stereo Preamplifier (1978-79) it does have a few 5534, are those also Phillips ?
They have the Signetics "S". Signetics was bought by Philips in 1975 so own could say these are made by Philips (with only 1 "l" contrary to the Phillips screwdriver).
That device needs good (not cheap) IC sockets, new electrolytic caps and it seems the film caps have been caught by moisture/mold build up. If you are at it you can also replace the caps that tarnished the reputation of tantalum caps for ever: the blue drop type tantalum caps.
The opamps are really last of your concerns.
That device needs good (not cheap) IC sockets, new electrolytic caps and it seems the film caps have been caught by moisture/mold build up. If you are at it you can also replace the caps that tarnished the reputation of tantalum caps for ever: the blue drop type tantalum caps.
The opamps are really last of your concerns.
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Until now I don't understand, why optimizing to best values for SNR provides any audible advantages while a listening test - check out this thread:
https://www.diyaudio.com/community/...e-noise-i-want-to-know-all-approaches.296358/
For me much more important than SNR of RIAA phono preamps is the sonic character itself.
Differences between -55db and -85db SNR are only to be perceived, when tonarm is lifted.
If one weren't dealing with record noise like on a microphone pre-amplifier every db higher SNR provide advantages.
If its not broke, don't fix it. Ensure the socket has tin-plated contacts, not gold (never mix tin and gold), and isn't getting loose. Replacing an IC socket carries a risk of damaging the PCB pads.
Maybe, buts its very noticable/annoying at that point if you been listening at high levels. Its dead easy to make a reasonably quiet phono preamp, so why wouldn't you?
I will replace all the caps, the specs for the preamp are amazing, Total harmonic distortion: 0.0003%, no phono section but I dont care
Is there another op-amp that uses the same power requirements as the 5534 ? That way the preamp does not get any oscillation
JRC NJM5534DD is supposedly tighter specifications. PMI had the SSM2134 which was marketed as an improved NE5534AN.
Because then you can't realize all approaches that are possibly inferior in sound character to those that have an excellent SNR - e. g. this approach:
https://www.diyaudio.com/community/...king-in-inverted-mode-not-to-find-why.222677/
https://www.diyaudio.com/community/threads/riaa-amp-using-shunt-feedback.249557/
With a DIP Adapter you could use the following opamps:
- LT1028
- AD797 (needs good supply bypassing to run stable)
- OPA1655
- OPA1611
- OPA1641
- AD8597
From a perusal of the noise plots, looks to me that OPA2210 beats NE5534 in that (moving magnet) application. Lower mid-band voltage noise, similar current noise. Plus lower noise corners.