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Old 12th September 2013, 12:58 PM   #2281
rsavas is offline rsavas  Canada
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Milosz,

Thanks for your reply, information, you stated it much bettter than I. I see at as Iron/steel concentrates the M field, (leakage flux) thus you can direct/concentrate it to some degree.
This is how they find Fe in the ground, by measuring the earths Mag field, concentration of flux density using a magnetometer. Check it out, a cesium beam mag using the lamor principle.
http://scintrexltd.com/dat/content/CS-3.pdf
There has to be a good reason why hi quality transformers are shielded with steel.
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Old 12th September 2013, 01:40 PM   #2282
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I have a small hand held device that picks up these fields. Its design use was to determine which polarity results is less field. (I dont know if that really helps, but the field is stronger one way than the other) and I can detect fields easily no matter what the case is made of. Basically, you can make your case out of whatever, if its close it will hum.

Russellc
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Old 12th September 2013, 04:36 PM   #2283
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I have a small hand held device that picks up these fields. Its design use was to determine which polarity results is less field. (I dont know if that really helps, but the field is stronger one way than the other) and I can detect fields easily no matter what the case is made of. Basically, you can make your case out of whatever, if its close it will hum.

Russellc
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Old 18th September 2013, 08:02 PM   #2284
Siberia is offline Siberia  Lithuania
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Is this kind of resistor appropriate for R21-24 positions?

YR1B20RCC - TE CONNECTIVITY / NEOHM - RESISTOR, METAL FILM, 20R, 250MW | Farnell United Kingdom

I'll go for 20 ohms value to see what it gives on input jfets. At the moment I've got around 69-70mV across each.
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Old 19th September 2013, 01:23 AM   #2285
6L6 is offline 6L6  United States
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Siberia - yes, those resistors are fine.
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Old 1st November 2013, 11:58 AM   #2286
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My Pearl 2 build has been up and running and making sweet music for the last two weeks and sounds great!

Trouble is I can now hear all the faults in my humble Systemdek. Upgraditis has struck me.

Thanks to Jim (6L6) for the great build guide and all the great minds here for the wise posts.

Right, now for an Aleph J and a DCB1.
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Old 1st November 2013, 12:17 PM   #2287
6L6 is offline 6L6  United States
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Jim,

Congratulations! May we see some photos of your Pearl2?
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Old 28th December 2013, 02:53 PM   #2288
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Default pearl phono two help

what are the values for r20 r14 r15 and c15 for a grado reference master any help will be appreciate
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Old 16th January 2014, 07:55 PM   #2289
poli is offline poli  Germany
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Hi everyone,

first of all happy new year to all Pearl 2 enthusiasts!
I finished my Pass Pearl 2 about a year ago but due to personal reasons I did not really have the time to test and enjoy it...
Now I am back on track and have time to fiddle around with the Pearl 2 - and
I am having some weird sound phenomina:
Whenever I listen to records with great dynamic peaks or so I get distortion and clipping with my Pearl 2. I have changed the pickups from Benz Glider (heavy clipping) to Denon DL 103 (less clipping but still disturbing) and I have also tried the "Zobel" network as Wayne described in another post (resistor and capacitor in series bridging the RCA input jacks) but no luck with this one.

Does any of you have encounterd similar problems? Might it be that the JFETs are gone or damaged? What can this be?

I don't hear hiss or hum from the stage, everything else is fine but the distortions are really irritating.

Thanks for any hints!

Best regards

Michael
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Old 16th January 2014, 09:03 PM   #2290
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Both the Glider and the Denon should not put out enough voltage to drive the Pearl into clipping (not by a long shot). So I would first make sure the cartridges are set up right (VTF, anti skating etc). Then rule out the possibility of bad pressings. And finally check the values of some components in the Pearl. For instance the resistors that define the gain (should be between 300R and 1K) and the resistor that determines input impedance. If none of this solves the case I would indeed check the FETs and transistors.
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