Almost finished repopulating the Pearl Boards, forgot to order the 221 ohm resistors I wanted and some standoffs for Rx and Cx. I will need to build little shelf’s on the chassis sides for C1 and C26.
B1 is completely redone besides the volume and switch wiring.
Probably tomorrow I will look at getting the power box stated. I will need to do a dry fit for everything in it before getting the components in permanently.
B1 is completely redone besides the volume and switch wiring.
Probably tomorrow I will look at getting the power box stated. I will need to do a dry fit for everything in it before getting the components in permanently.
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Russellc,
I have a few question’s for you if you do not mind.
In the first attachment:
What is the device circled in white?
It looks like main power coming in but what are the two red wires that I marked in yellow.
Same goes for the wire I marked blue. I believe it is the ground from the main power but not know what that little device is with the two red wires on I just want to be sure.
On the second attachment:
What wires are those that I put a blue line next to? It almost looks like they go under the board but am not sure.
And just a general question.
The secondaries coming off of the transformer and go under the power board, are both the blue and green wires getting hooked up to the board under there?
Thanks, James
I have a few question’s for you if you do not mind.
In the first attachment:
What is the device circled in white?
It looks like main power coming in but what are the two red wires that I marked in yellow.
Same goes for the wire I marked blue. I believe it is the ground from the main power but not know what that little device is with the two red wires on I just want to be sure.
On the second attachment:
What wires are those that I put a blue line next to? It almost looks like they go under the board but am not sure.
And just a general question.
The secondaries coming off of the transformer and go under the power board, are both the blue and green wires getting hooked up to the board under there?
Thanks, James
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I am wondering if anyone made the changes to the values of the components listed in this post? Thanks.
I have attached the screenshot from the post showing the new values.
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Last edited:
Yes, I did. I made some (many) modifications to my Pearl 2 (will report later), one of them was changing the values of the RIAA. Because I'm also in the process of installing a new cartridge, I have not had a chance to listen to the result of all the modifications.
These were posted before, but to spare y'all having to parse a thousand posts:
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Thank you very much for the post and reply. I will show my ignorance here and let you know the last two screenshots do not point me in a direction for component changes where as the post of yours that I quoted does have gym on it valuable information in there.
So far I found the below information you had posted which, if I read everything in context, would make these boards more MM friendly.
R9 - 255 ohms
R12 - 6.81K
R2 - 100K||1K
C10 - .110uf
C12 - .1uf
C16 - .1uf
C20 - .32uf
Thanks, James
Wellerman,
That would be greatly appreciated if you can let me see the changes you made when you have the time.
Thanks, James
Don't know if you're supposed to change R9, I kept it at 499. Others might know. You can also lower gain by increasing R14. R11 = 6k81 just like the original schematic. For RIAA change R12 to 990 (100K||1k, but Vishay also has a 990 in their CMF series). C10+C11+C14 = 0.11uF (so you could just leave out C10 or C11 from the original schematic). C17+C18+C19+C20 = 0.32uF (easiest to choose C20 = 0.02 or 0.022uF). C12 + C16 can be increased in value if you want less subsonic rolloff.
Jackinnj,
Would you be so kind as to let people like me know components were changed and to what values to get the second curve in your post.
It would be greatly appreciated.
