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Building a Pearl 2
Building a Pearl 2
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Old 10th April 2020, 11:02 AM   #1901
KatieandDad is offline KatieandDad  United Kingdom
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If you look at the Aleph J BOM at the DIY store, in that application the ZTXs are replaced by BC equivalents.
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Old 10th April 2020, 11:45 AM   #1902
AnthonyA is offline AnthonyA
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So no issues with higher hfe okay
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Old 10th April 2020, 12:09 PM   #1903
McQuaide is offline McQuaide  United States
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Quote:
Originally Posted by Dneu2011 View Post
Iím experimenting with different resistors but finding I enjoy the 47k already loaded.

I do find that I am experimenting a bit too much noise at halfway on both cartridges. Itís not hum, but more of a fluttering/ground loop noise.

Iím running a Dynavector 10x5 ó> Pearl 2 -> BA3FE -> F4 -> Cornwall III.

I figure itís just a lot of gain.. I do have 1K resistors on the Ba3FE and the Dyna is a HOMC so puts out more.. sounds amazing but lowering the noise would be nice. Although, the Cornwall IIIs are very efficient at 101 db.
That Denon is going to be happier around 100 ohms and the Dyna around 1000.
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Old 10th April 2020, 12:21 PM   #1904
mhenschel is offline mhenschel  Canada
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Dneu2011:

What are those turrets you installed for the loading resistors and caps to let you play with the values? Do they make good connection with the component leads such that you can leave them on the board? Or is the idea to take them out when you're happy with the loading and solder your final choices in? Thx.
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Old 10th April 2020, 12:25 PM   #1905
KatieandDad is offline KatieandDad  United Kingdom
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Originally Posted by AnthonyA View Post
So no issues with higher hfe okay
Local feedback normally takes care of differences in the gain of different devices. If it didn't each channel would need perfectly matched components.
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Old 10th April 2020, 06:26 PM   #1906
codyt is online now codyt  United States
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Quote:
Originally Posted by Dneu2011 View Post
...Itís not hum, but more of a fluttering/ground loop noise.
out of curiosity, do you get any woofer pumping at those higher volumes?
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Old 10th April 2020, 10:04 PM   #1907
Dneu2011 is offline Dneu2011  United States
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New mouser parts came in today for me to change out the wide heatsinks I had so they were not touching the large filter caps. I changed them out and while under the hood I changed the twisted rca wires I had to some shielded rca wires and the phono is now dead silent! Before I changed the wires, I was also having noise issues when switching out the loading resistors. I now don't get the noise and the posts I have make a good connection with the resistors when swapping them out.. Next is to create a switch for changing the loading resistor... but for now I will enjoy the phono as is...

This is truly a solid performer and it will be replacing my tubes4hifi PH-16 tube phono....

Thanks again for everyone's help on this build.
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Old 10th April 2020, 10:16 PM   #1908
stablgr is offline stablgr  Scotland
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Building a Pearl 2
I've almost finished building an external power supply which I'm planning to use to power an M2X (or F5) power amp, Korg B1 pre and Pearl II phono stage (I think I've got most parts gathered in boxes lying around somewhere). My question is; Is there any advantage/disadvantage to adding additional capacitance to the supply lines locally inside the enclosures for the Pearl II and Korg B1? Each will be housed in separate enclosures.

This is the progress I've made so far...

Last edited by stablgr; 10th April 2020 at 10:29 PM.
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Old 10th April 2020, 10:31 PM   #1909
stablgr is offline stablgr  Scotland
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Building a Pearl 2
I tried to attach a photo, but struggling to figure out how. The forum guide says to set up a privatte gallery then upload photos there. But I can't figure out how. Is there an easy way to do this?

Many thanks,
Gary
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Old 10th April 2020, 10:40 PM   #1910
Dneu2011 is offline Dneu2011  United States
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Go advanced.

Manage attachments.

Choose file for each picture.

After you have all your pics chosen, click upload.

Then you can send your message.
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