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RIAA preamps versus real loads
RIAA preamps versus real loads
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Old Today, 12:34 PM   #101
carlmart is offline carlmart  Brazil
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Don't have a test record or plan to get one.
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Old Today, 12:38 PM   #102
MarcelvdG is offline MarcelvdG  Netherlands
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Then you have to resort to the method Hans proposed in post #95.
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Old Today, 12:40 PM   #103
carlmart is offline carlmart  Brazil
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Now what about supplies for this RIAA preamp?

My inclination is toward using Jung/Didden supplies that I will assemble myself.

For a time I did consider 3X7 supplies with denoizators (hopefully everybody knows what I'm talking about) but I have read scarce feedbacks on how it affects the audio quality.

Other options seems to be LT3042/45 power supplies, but assembled ones come not cheap. And my experience with SMD parts is close to none.

What are your opinions on this matter?
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Old Today, 12:41 PM   #104
carlmart is offline carlmart  Brazil
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Yes, I already got in contact with Bill and he suggested for me to send the photos.

Better yet would be to find the original Grado box.
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Old Today, 12:46 PM   #105
billshurv is offline billshurv  United Kingdom
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RIAA preamps versus real loads
I am a fan of Jan's silentswitcher, but aware I am into advanced **** polishing with that as Hans and Syn08 have proven.
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Old Today, 02:11 PM   #106
Bonsai is offline Bonsai  Europe
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If the current consumption is below say 20mA (you could always parallel the two halves in a dual to get 40mA) the LM4562 makes a superb linear reg. PSRR at LF >110 dB and its still 80 dB at 100 kHz and its very low noise (pV/rt Hz).
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Old Today, 03:16 PM   #107
carlmart is offline carlmart  Brazil
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Quote:
If the current consumption is below say 20mA (you could always parallel the two halves in a dual to get 40mA) the LM4562 makes a superb linear reg. PSRR at LF >110 dB and its still 80 dB at 100 kHz and its very low noise (pV/rt Hz).
What linear regulator would be that? I would like to simulate it in LTSPice and compare it to the others.
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Old Today, 03:27 PM   #108
MarcelvdG is offline MarcelvdG  Netherlands
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As op-amps have a pretty good PSRR at low frequencies, plain old 78xx/79xx supplies should work fine - but using something fancier won't do any harm, of course.
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Old Today, 03:47 PM   #109
carlmart is offline carlmart  Brazil
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My comparisons between 78XX/79XX and 3X7 in the '80s and later went very bad for the former, always.
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