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Which regulator for phono preamp?
Which regulator for phono preamp?
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Old 3rd July 2020, 06:46 PM   #21
jackinnj is offline jackinnj  United States
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Which regulator for phono preamp?
Quote:
Originally Posted by billshurv View Post
what about the 7dB noise penalty that gives you? Or do you mean Cordell style 'damped' loading with an 8kHz roll off?
I was at the other location without my usual test setup. I ran this test several times with LME49710 and 47k and 11k load resistors and an Audio Technika VM540ML cartridge. I don't see the noise penalty. 7dB should be 2.2x noisier.
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Old 3rd July 2020, 10:26 PM   #22
billshurv is offline billshurv  United Kingdom
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Which regulator for phono preamp?
11k seems a bit high for a cartridge in the 450mH area. I don't have numbers for the new stuff but my ATs are 360mH or less. I would expect you to need around 7K to get the 2122Hz pole. Hans simmed it with Marcel a couple of years back and here are is the quote from his post



Quote:
I simulated 3 versions of a Riaa preamp, again with 500mH + 600 Ohm Cart and OPA1652.
The 3 versions differed in their Cart load resistances, resp 47K//200pF, 25K//200pF for a 8Khz pole and 6k//200pF for a 75usec pole.


All 3 versions were simulated with and without a "cooled" resistor, in this case by using a second OPA1652 with a gain of 10x.
This time I corrected the switched inputs of posting #152, giving slightly different results, but not much.
I won't display all images, that would a bit too much, but the final results are here with minus figures in red:


-------------Noise penalty-------"Cool" Gain---------Overall Gain/Loss

Version 47k ----- 0dBA ----------- 1.6dBA --------------- 1.6dBA

Version 25K --- 2.0dBA ----------- 3.1dBA --------------- 1.1dBA

Version 6K -----7.6dBA ----------- 7.3dBA --------------- 0.3dBA

Now this was pushing the limits of noise for MM stages mind.
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Old 4th July 2020, 12:28 AM   #23
jackinnj is offline jackinnj  United States
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Which regulator for phono preamp?
I will be happy to repeat with Hans' values. I think, however, we are straying from the OP's purpose which is PS related.
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Old 5th July 2020, 01:34 PM   #24
jackinnj is offline jackinnj  United States
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Which regulator for phono preamp?
Looking at the Measuring phono stage RIAA accuracy with a computer

I did not stimulate the cartridge -- a shortcoming in the measurements and looking at the thread a daunting task! (It took me a day to remember where I had seen the chart).

In any event, the LR Phono Pre seems worthy of a thread.
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Old 5th July 2020, 10:04 PM   #25
billshurv is offline billshurv  United Kingdom
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Which regulator for phono preamp?
Quote:
Originally Posted by jackinnj View Post
I will be happy to repeat with Hans' values. I think, however, we are straying from the OP's purpose which is PS related.

We are, but I would be interested to explore this further if you ever find the time.
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Old 5th July 2020, 11:03 PM   #26
itsikhefez is offline itsikhefez  United States
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Which regulator for phono preamp?
I ordered a SilentSwitcher, and I have the AMB sigma22 with transformer.
I'll try them both to see if there is an audible difference.

I would also be interested to measure for the learning experience, but I may not have the appropriate tools.
I have a Tektronix 2235A, a Fluke 87V DMM, and PC w/ ARTA and Pete's sound card interface (I also have Jan's autoranger on the way).
If possible, could someone recommend a useful test here?
 

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