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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 30th March 2019, 05:26 PM   #1291
Hicoco is online now Hicoco  France
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Doug Self Preamp from Linear Audio #5
Thanks
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Old 30th March 2019, 05:41 PM   #1292
rsavas is offline rsavas  Canada
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Did anyone measure the offset voltages? Since the offsets are so low, I do not think polarity is problem.
When in doubt I use Nichicon UES or film.
DougS has written that he prefers large V and C to minimize the low freq THD in ecaps.
I also read that someone in the forum measured ecap thd on a number of models/brands, the Nichicon Muse BP UES series was the winner, but only marginally.

Last edited by rsavas; 30th March 2019 at 05:46 PM.
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Old 30th March 2019, 06:15 PM   #1293
diyralf is online now diyralf
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Quote:
Originally Posted by rsavas View Post
Did anyone measure the offset voltages? Since the offsets are so low, I do not think polarity is problem.
When in doubt I use Nichicon UES or film.
DougS has written that he prefers large V and C to minimize the low freq THD in ecaps.
I also read that someone in the forum measured ecap thd on a number of models/brands, the Nichicon Muse BP UES series was the winner, but only marginally.

THD is not a function of brand or V.
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Old 7th April 2019, 05:23 PM   #1294
Hicoco is online now Hicoco  France
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Doug Self Preamp from Linear Audio #5
Do you know where I could find Amgis L01-6354 or equivalent, Digikey is out of stock thanks.
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Old 10th April 2019, 09:58 AM   #1295
hadihf is offline hadihf  Pakistan
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Quote:
Originally Posted by Carl_Huff View Post
That's a really good question that has not been asked before! Orientation didn't matter with the caps that I used, but ...

if you are building with polarized Silmics, I would follow the direction as published in the Linear Audio article.
Pointed out in post #1076
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Old 1st May 2019, 02:55 PM   #1296
Hicoco is online now Hicoco  France
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Statsokonomen View Post
I also first attempted using Hicoco's version of the back panel, and found that it didn't fit (a few millimeters off on many parts).

I'll measure myself and will order a new back panel from Schaeffer when my measurements are done. If the new panel fits the board, I'll post the Schaeffer / Frontpanel Express file in this thread.
I'm sorry, but I should have advise that I had not used Rick G's post # 876 files yet..
you are right, unfortunately that it don't fit...i am changing right now the measurements...
Carl by any chance, do you have the quad rca phono socket pdf datasheet?
Thanks

Last edited by Hicoco; 1st May 2019 at 02:59 PM.
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Old 1st May 2019, 03:52 PM   #1297
Carl_Huff is online now Carl_Huff  United States
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Originally Posted by Hicoco View Post
Carl by any chance, do you have the quad rca phono socket pdf datasheet?
Sorry, I don't but they are easy enough to measure with a linear caliper. I am not at home right now or I would do it myself.
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Old 1st May 2019, 04:01 PM   #1298
Hicoco is online now Hicoco  France
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
Sorry, I don't but they are easy enough to measure with a linear caliper. I am not at home right now or I would do it myself.
Thank Karl i appreciate that, i don't have a linear caliper.
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Old 1st May 2019, 04:09 PM   #1299
Carl_Huff is online now Carl_Huff  United States
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Originally Posted by Hicoco View Post
Thank Karl i appreciate that, i don't have a linear caliper.
Well, if nobody else responds I will measure them in a couple of days when I have access and opportunity. Are you looking to create a 1U back panel to go with the front panel FPDs that I previously provided?
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Old 1st May 2019, 04:12 PM   #1300
jwilhelm is offline jwilhelm  Canada
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I have this drawn in Fusion. I'll try to put some dimensions together from it.
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