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Old 16th October 2011, 11:09 PM   #11
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Gents ,

PSU can be ran at 24vdc .... am I understanding this correctly ?

I had the idea I would used Peter Daniels universal boards and build the same PS for my Pearl .

As being as I'm building a balanced version requiring 2 boards - a symmetrical board with power both ... correct ?

Rich
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Old 17th October 2011, 01:40 AM   #12
6L6 is offline 6L6  United States
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The stock B1 can be run at 24v, but neither of the Pearls can be run that low.
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Old 24th February 2012, 03:59 PM   #13
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Just now getting around to soldering this together, a few questions:

1. Where did you put the 240 ohm resistor? is it on the backside? I see it in the regulator manufacturer's schematic, but dont see it on board. Which two points does it attach to? (yeah, I need the specific of instruction)

2.With the pot, center leg (wiper) soldered to either leg, then it looks like the other two go in the holes for R2?

Thanks,
Russellc
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Old 24th February 2012, 04:12 PM   #14
6L6 is offline 6L6  United States
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You are asking about the Peter Daniel Universal PSU, right?

The 240 Ohm resistor is on the front, it's just hiding under the pot in the photo. Install it is the "R1" position, closest to the regulator.

Yes, solder the wiper to one of the legs and install in position "R2"
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Old 24th February 2012, 04:33 PM   #15
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The B1 is pretty forgiving with its PSU.

I run mine from a 30VA 9-0-9V into a stock 1A bridge then CRC with 2 x 4700uF LCR caps with 2R2 between them. Reg is a straightforward LM317.

Its actually better than a DCB1 that I am trial building at the moment. I did use Obbligato 10uF Caps though.

The little PCB on the top left is just a Mains Filter that I pinched straight out of a VCR.

The PCB is Home-Brew. Although it is Double Sided there are no tracks on the Upper Surface, just the Ground Plane.
Ever so easy to make at home.
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Last edited by KatieandDad; 24th February 2012 at 04:37 PM.
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Old 2nd June 2012, 03:58 PM   #16
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anyone have one for sell ?????
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Old 2nd June 2012, 10:25 PM   #17
6L6 is offline 6L6  United States
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The circuit boards are available at Passdiy.com

I don't know if anybody is selling their complete project. Perhaps.
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Old 10th June 2012, 09:31 AM   #18
NZkeith is offline NZkeith  New Zealand
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Quote:
Originally Posted by 6L6 View Post
The circuit boards are available at Passdiy.com

I don't know if anybody is selling their complete project. Perhaps.
Thanks for ALL your input, much appreciated by a total novice.... All this started because of a thread of mine regarding a 'simple RIAA' circuit modification to my existing little amp....." tubes-valves/213236-tube-pre-amp-both-cd-phono-inputs.html "

The amount of return info has been great.... Any other input or modifications to 'my' circuit will still be gladly received and appreciated... THANKS

Best wishes to all contributors and readers.... Cheers from New Zealand
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Old 12th June 2012, 01:23 AM   #19
rabaird is offline rabaird  Australia
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I just finished a B1 build using the PCB and JFETs from PassDIY and capacitors, Alps Pot and a 6 input rotary switch kit from HiFi Collective.
The case is my old NAD 1300 preamp (1990's vintage) which recently died - hence this project.

I also run the Oatley K303 RIAA amp in a separate box which is fine for my old turntable, a late 60's vintage Dual.

I'm powering the B1 off an old laptop computer PS. It seems to be OK.

I like this preamp. It works really well, sounds great. I need a new CD player now.
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Old 4th July 2012, 05:14 AM   #20
PKI is offline PKI  United States
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Thanks for your help!
Here is mine B1:
Click the image to open in full size.
I guess capacitors still breaking in, so can't tell if I like it better than my Threshold SL-10.
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