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"Equal Opportunity" MM Pre
"Equal Opportunity" MM Pre
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Old 9th May 2014, 03:52 PM   #1
jackinnj is offline jackinnj  United States
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"Equal Opportunity" MM Pre
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SY's newest baby in LA Volume 7.

I don't think that the 3.18uS compensation (Neumann) is necessary (the 91R):

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Without it you'd be hard pressed to get an RIAA network which hugs the curves so tightly:

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I can't wait to start soldering this one up!
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Old 9th May 2014, 07:50 PM   #2
jackinnj is offline jackinnj  United States
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The second chart is deviation from RIAA with gain at 1kHz set to 0. I guess -2.22e-16 is pretty close to zero. If it performs this well, it's to the standards of the best phono pre's reviewed by Stereophile.
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Old 9th May 2014, 08:02 PM   #3
Stormrider is offline Stormrider  United States
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What publication is this in?

EDIT: Found it. LA = Linear Audio ... Duh.
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Old 9th May 2014, 08:43 PM   #4
SY is offline SY  United States
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With luck, I'll have the new PCBs up, running, and tested this weekend. "Real" work and an overdue AX article got in the way.
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Old 18th May 2014, 01:36 PM   #5
2wice is offline 2wice  South Africa
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This will work great with a TD 124. Very curious to see this.
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Old 22nd May 2014, 12:48 PM   #6
jackinnj is offline jackinnj  United States
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Here's an idea for a bias supply -- if you run the filaments from a.c. the LR8N3 will regulate the 150+ B+ to a convenient level for the LT3439 quiet switcher. The output is filtered and regulated with an LT3015 for a very quiet bias supply to the P-channel jfet:

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in surface mount, the entire thing should take up real estate of less than 2 square inches.
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Old 3rd June 2014, 06:19 PM   #7
2wice is offline 2wice  South Africa
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Did you get it soldered up yet?
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Old 7th July 2014, 05:07 PM   #8
SY is offline SY  United States
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Quote:
Originally Posted by 2wice View Post
Did you get it soldered up yet?
Yes. The next issue of Linear Audio will have details. Suffice it to say that the performance is reasonably good, if by "reasonably good" one means distortion that challenges the test set residuals (-100dBV) and overload margins that exceed 50dB ref 5mV.
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Old 31st July 2014, 11:53 PM   #9
jackinnj is offline jackinnj  United States
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prototyping with one of Pete's neat little boards:
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Old 1st August 2014, 01:46 AM   #10
SY is offline SY  United States
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Here's a teaser. 1.3V out into 10k.
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