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Old 20th April 2013, 08:54 PM   #2141
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Quote:
Originally Posted by c_door View Post
With the pot mounted on the bottom side of the lower board, and a small hole on the bottom panel, it should work.
Good thinking!
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Old 6th May 2013, 02:09 PM   #2142
omishra is offline omishra  India
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My build completed:

Pearl 2 boxed -

image981.jpg

Dual unregulated 33V Power Supply -

image982.jpg
Using 22-0-22, 30VA r-core CT transformer.

PS connected with umbilical 3 core shielded cord with chassis ground (mains earth ground) connected through shield of the cord. 3 cores carry +v, 0, and -ve of PS. PS Cord length is 3 Ft. Somehow I misplaced Ferrite bid to be placed on mains power cord.

image983j.jpg

Waiting for face plates.

image984z.jpg

Impression - Very silent, clean and rich. Gain is very much, output is near to CDP level.

Two things amazed me.
1. How there are lesser clicks and pops compared to another phono? This is simple class A, there is no filter apart from passive RIAA network. I think somehow other phono circuits make it to resonate and amplify where these are here to the actual quantity.
2. Subsonic roll-off. Some records used to move speaker cone with 1-2 time /sec. That was inaudible subsonic waves. I was forced to use damping brush of my Shure M97xe cart. Now they are reduced and I can play without damper brush of my MM phono cart.

Thanks Wayne and all of you wonderful people.

Last edited by omishra; 6th May 2013 at 02:13 PM.
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Old 6th May 2013, 03:09 PM   #2143
6L6 is offline 6L6  United States
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Wonderful! Congratulations on a beautiful construction!

Did you have any issues during building?
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Old 6th May 2013, 03:18 PM   #2144
Marra is offline Marra  United Kingdom
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@omishra a very nice build.
From where did you obtain the R core transformer?
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Old 6th May 2013, 06:50 PM   #2145
omishra is offline omishra  India
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Quote:
Originally Posted by 6L6 View Post
Wonderful! Congratulations on a beautiful construction!

Did you have any issues during building?
Thanks! I read on this forum to exclude C7 - that's all. Only problem I faced was - settling 0 mv at output test pad where it was varying between +10 to -10mV within 30sec duration. Still worked fine. I kept it as is because though inputs were shorted still boxes were open for adjustment.
Quote:
Originally Posted by Marra View Post
@omishra a very nice build.
From where did you obtain the R core transformer?
Thanks, R-core transformer is built by local exporter from Hyderabad India whose name is written there. That guy saved my money by avoiding label print cost too. It cost little under $10 USD each for batch of 10 pieces.

Now waiting for wooden faceplates and some heatsink to regulators, they are more than warm.

Those rectifier diodes are MUR860.
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Old 6th May 2013, 06:54 PM   #2146
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Very nice build. I'm thinking of building a phono stage too. Problem is, I don't own a turntable or any records.
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Old 6th May 2013, 07:01 PM   #2147
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You could try licking the input at a high frequency.
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Old 6th May 2013, 09:40 PM   #2148
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Quote:
Very nice build. I'm thinking of building a phono stage too. Problem is, I don't own a turntable
Make your own table.
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Old 6th May 2013, 09:46 PM   #2149
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[QUOTE=omishra;3481013]Thanks! I read on this forum to exclude C7 - that's all. Only problem I faced was - settling 0 mv at output test pad where it was varying between +10 to -10mV within 30sec duration. Still worked fine. I kept it as is because though inputs were shorted still boxes were open for adjustment.

+/- 10mV is very good. Mine sometimes runs away to + or - 60 to 80mV. Most of the time it is between +/- 20mV though. This is with the inputs open.
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Old 6th May 2013, 10:02 PM   #2150
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I kind like the u-turn turntable on kickstarter. Anyone see that?
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