RC4559 Dual Opamp replacement (BB OPA?) - diyAudio
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Old 1st April 2012, 02:54 PM   #1
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Default RC4559 Dual Opamp replacement (BB OPA?)

Dear Forum,
The output stage of my ReVox B261 tuner is an RC4559 dual opamp. Being a 30-year old design I can just imagine there should be something better available in 2012..
As a direct equiv I saw a BB OPA2111AM but bloody expensive (Farnell approx 23 Eur) If this would be a real improvement I would even do it but sofar no proof..

Any good suggestion? I would use the OPA 627 but the board design does not allow :-)

Leonard
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Old 1st April 2012, 08:36 PM   #2
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I would suggest LME49720. Of course, the tuner being a thirty year
old design, you will have to check for stability after changing the op amp.
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Old 2nd April 2012, 12:34 AM   #3
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Let's be realistic.
A quality tuner of the day would still have had at least 0.2% THD + Noise in stereo FM mode. Even a pulse counting detector type will still have 0.1% at best.
It would be pointless to fit anything better than standard parts. However, the 5532 is still 2 orders of magnitude better, cheap, readily available and suitable for output applications.
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Old 2nd April 2012, 04:52 AM   #4
jaycee is offline jaycee  United Kingdom
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I agree, throw an NE5532 in there - and that's already muchly better without being stupidly expensive. Yes, they're old design, but still excellent quality.

It's my feeling that theres just no point in using recent high-end opamps unless the circuit is designed for them.
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Old 2nd April 2012, 07:43 AM   #5
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get your shelf a few 5532 different makes they are dirt cheap
Many people so far including me noticed quite a lot of difference between 5532 makes
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Old 2nd April 2012, 09:20 PM   #6
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Guys thanks for the responses, I ordered a TI NE5532AP for the ashtonishing cost of 69 Eurocents. Can't really experiment with different versions as once soldered in and done, I don't see myself opening everything again to try a new opamp. Will compare once with the original RC4559 see if it makes any difference at all. Sand is sand (yes I'm a thermionic fundamentalist) after all :-)
Leonard
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Old 2nd April 2012, 10:29 PM   #7
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Quote:
Originally Posted by Ian Finch View Post
Let's be realistic.
A quality tuner of the day would still have had at least 0.2% THD + Noise in stereo FM mode. Even a pulse counting detector type will still have 0.1% at best.
It would be pointless to fit anything better than standard parts. However, the 5532 is still 2 orders of magnitude better, cheap, readily available and suitable for output applications.
Personally I would prefer to keep it original and use an RC4559. Apparently the designers have found it adequate for its job.

Regarding distortion: I've seen the inside of one professional Revox tuner and it had trimmed LC IF filters and a transmission line (coaxial cable) as the frequency to phase converter of the quadrature detector. That is, it was really designed for the lowest possible distortion, much more so than a typical consumer-grade tuner.
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Old 3rd April 2012, 02:50 AM   #8
jaycee is offline jaycee  United Kingdom
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Originally Posted by triodes4ever View Post
Sand is sand (yes I'm a thermionic fundamentalist) after all :-)
Glass is made from sand
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Old 3rd April 2012, 04:43 AM   #9
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By the way, the tuner I've opened is a Studer A726, not a B261. The A726 looks quite similar, except that it is intended for rack mounting and has a balanced output. I don't know if there are any other differences.
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