Posted by soulcargo (A) on February 20, 2009 at 06:28:23

Hi,

I am wondering if anybody can give me an idea of how much current a SETH 300b amp (one channel) would draw, so I can pick appropriate power supply iron from my stash?

150mA? less? more?

Thanks!

• RE: Seth current draw - mqracing 11:15:03 02/20/09 (3)
  In Reply to: RE: Seth current draw posted by soulcargo on February 20, 2009 at 06:28:23

  Hi SC:
  
  How much plate current are the 300B's being run at? How much current on the front end tube.
  
  I went to our website (www.magnequest.com) but the SETH there is the 2A3 version---
  
  our 04-002 chokes can be airgapped for 100 mils, 150 mils, and 200 mils.
  
  Advantage of 150 mil choke (all other things equal) is that you would get 150% more L--- which makes for better power supply filtering (again, all other things equal).
  
  MSL
  
  
  
  Builder of MagneQuest™ & Peerless™ transformers since 1989
  
  
  

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  • RE: Seth current draw - soulcargo 12:29:58 02/20/09 (2)
    In Reply to: RE: Seth current draw posted by mqracing on February 20, 2009 at 11:15:03

    I've never built a PP amp. The SETH will be my first.
    
    So I'm not sure how much current the PP 300bs will consume.
    
    I figured someone else might know.
    
    

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    • RE: Seth current draw - keto 16:17:39 02/25/09 (1)
      In Reply to: RE: Seth current draw posted by soulcargo on February 20, 2009 at 12:29:58

      here's an option for PP300B
      
      for 20W and a 4K plate to plate load, looks like the current would swing from 170mA to 200mA, in A1.
      
      I don't know what A1 means ;-)
      

      • http://www.westernelectric.com/spec_sheets/300B.pdf   (Open in New Window)

      
      

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      • Thanks! (nt) - soulcargo 06:18:37 02/26/09 (0)
        In Reply to: RE: Seth current draw posted by keto on February 25, 2009 at 16:17:39

        nt
        
        

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