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Old 5th March 2013, 12:44 AM   #2021
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6 ,

I went on you tube to get the set up advice . The cartridge is a Pro S Ortofon.

The counter weight just wont adjust . Set as advised , float the arm and Zero the weight , then add weight ,but nothing happens . I had to set it by ear .

Keeping the same arm for the moment . There are other upgrades I'd like to do first : PSU , cartridge , oil damping .

thanks .
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Old 5th March 2013, 07:57 PM   #2022
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Get one of those precision scales from Dealextreme. They cost next to nothing and are way more accurate in setting tracking weight than just believing what the indicator on the tonearm says.

Anyway, congratulations on your build, I too would like to see some pictures and hear more detailed experiences.
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Old 5th March 2013, 08:08 PM   #2023
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Quote:
Originally Posted by richluvsound View Post
6 ,

I went on you tube to get the set up advice . The cartridge is a Pro S Ortofon.

The counter weight just wont adjust . Set as advised , float the arm and Zero the weight , then add weight ,but nothing happens . I had to set it by ear .

Keeping the same arm for the moment . There are other upgrades I'd like to do first : PSU , cartridge , oil damping .

thanks .
Once the weight indicator ring is zero and the arm is floating, turn the counterweight (not the indicator ring) so that it screws in and moves closer to the tonearm pivot. The closer the weight to the pivot, the more weight on the cartridge.
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Old 6th March 2013, 01:19 AM   #2024
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Thanks again folks. I can be ultra-dense sometimes LOL .....

Have to agree the above comments too !

Big thanks to the Colorado mountain man

R
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Old 7th March 2013, 01:51 AM   #2025
kop89 is offline kop89  United States
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Want to order the parts now, but do not have the PCB's on hand.

What is the maximum diameter and lead spacing for the 10KuF electrolytics (C1, C26)? Would a snap-in capacitor with 10mm lead specing fit into the holes? Thanks.
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Old 7th March 2013, 03:31 AM   #2026
6L6 is offline 6L6  United States
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kop89 - look at the original Pearl 2 article on PassDIY - there is a partial BOM with some part numbers, and you can take a look at the suggested parts to see what dimensions you need. It's a great way to find out that kind of stuff, and some pieces and parts might be NLA or obsolete (probably not for the Pearl 2, it's a recent article) you can get the basic idea of what is needed by cross-referencing the datasheets from the BOM parts with similar parts.
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Old 7th March 2013, 10:45 AM   #2027
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Maximum diameter would be 25 mm as you are contending with the heat sinks from the voltage regulators. I had purchased 35 mm by mistake and they definitely do not fit.
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Old 7th March 2013, 02:23 PM   #2028
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Quote:
Originally Posted by 6L6 View Post
kop89 - look at the original Pearl 2 article on PassDIY - there is a partial BOM with some part numbers, and you can take a look at the suggested parts to see what dimensions you need. It's a great way to find out that kind of stuff, and some pieces and parts might be NLA or obsolete (probably not for the Pearl 2, it's a recent article) you can get the basic idea of what is needed by cross-referencing the datasheets from the BOM parts with similar parts.
Here's my BOM updated as of a year ago. Hope this is useful.

http://dl.dropbox.com/u/370002/Pearl-2%20BOM.xls
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Old 8th March 2013, 02:46 AM   #2029
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Quick eyeball from the experts. I took Salas suggestion to increase the resistance of R21-R24 to increase the voltage around Q3. My differed quite a bit from Wayne's. A few of you said this was probably due to different values for ldss on the FETs I had vs what Wayne had.

I swapped in 20R resistors for the R21-R24 and measured - see attached. Original values for 10R in in parentheses. Voltages are pretty close, still a little under.

Close enough? How important is to be spot on with these?

Also, my voltage across R6 is higher, at 1.8 vs 1.5. Is this acceptable, close enough?

It sounds really good on the bench with my cheap test system - no issues. As I put a fair bit of expense and time into this project, I would like to tune it to its full potential, within reason.
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Old 8th March 2013, 02:48 AM   #2030
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Here is the photo of my measurements.
Attached Images
File Type: jpg DSC_1032.jpg (562.9 KB, 134 views)
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