Shure SE1 tube phono preamp

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pwdiya12

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Joined 2012
quirkaudio.com/
#1
I want to build a power supply for this Shure SE 1 tube phono preamp. There are a bazillion power supply kits from EB, though I am uncertain as to the B+ voltage I require (outputs 4 and 5 on the attached circuit) and what the secondary voltage on the transformer should be.



Any suggestions would be greatly appreciated


Thanks
 

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#2
Shure copied the Dynaco PAS preamp circuit, so use the info in Dynaco's manual.
The power transformer secondary was 670VAC, center tapped.
The rectifier was 12X4. Raw rectified supply was 405VDC, filtered supply was 355VDC.
The phono stage supply voltage was 210VDC, and the line stage supply voltage was 330VDC.
You'll have to adjust the dropping resistor values if you only use the phono stage, but not the line stage.
https://www.thetubestore.com/lib/th...aco/Dynaco-PAS-3X-Schematic-Owners-Manual.pdf

You can buy the identical new power transformer here.
PA 211 (PAS) Power XFMR - Dynakit Parts

If you can find a cheap used Dynaco PAS preamp, that would be the easiest way.
They originally came from Dynaco with either Telefunken or Mullard tubes, if you can
find one still in original condition.
 
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#4
Are you looking for only a phono stage, or a complete preamp?
Will you build in a generic chassis, or in a Dyna chassis?
How much cost is acceptable (not including chassis)?

Note that there are stated incompatibilities with the #8 power supply board
and the Dyna circuit and Dyna transformer. I would not go this route because of this.
The standard Dyna power supply has no audible hum at all.
 
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