Tube DIY Asylum

Posted by lovetube (D) on November 06, 2009 at 17:02:06

Thanks
LT

• RE: is this reg ok for 300b Fil ? comment please - Al Noakes 03:45:19 11/07/09 (1)
  In Reply to: RE: is this reg ok for 300b Fil ? comment please posted by lovetube on November 06, 2009 at 17:02:06

  That design will nail the hum down but it's unlikely it will sound very good , AC will probably sound better . My suggestion is to try a ring of two CCS , rather than a series regulator . CCS connected chip regs sound ok but no-where near as good as a ring of two . If you absolutely must use a series reg , follow it with a laminated choke > 30mH . You will need to adjust the output voltage by adding diodes between the reg 0v pin and 0V rail or use an adjustable reg if you do this
  
  ps I don't know what that 1000uF cap on the output of the reg chip will do , I've never seen caps this value used in that place before . It may cause some instability
  
  Al
  

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  • a ring of two CCS - somejoe 10:03:11 11/07/09 (0)
    In Reply to: RE: is this reg ok for 300b Fil ? comment please posted by Al Noakes on November 07, 2009 at 03:45:19

    Got a schematic handy?
    
    

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• Did you find this online or design it yourself? - slownlo 17:36:46 11/06/09 (2)
  In Reply to: RE: is this reg ok for 300b Fil ? comment please posted by lovetube on November 06, 2009 at 17:02:06

  The LV805CV is a 5V/1.5A fixed voltage regulator, and can support the filament current demand of the 300B, Just use an AC transformer with a secondary voltage of 7.5VAC and current support of at least 1.5A (or more) and you should be good to go...
  
  
  

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  • RE: Did you find this online or design it yourself? - lovetube 18:17:35 11/06/09 (1)
    In Reply to: RE: Did you find this online or design it yourself? posted by slownlo on November 06, 2009 at 17:36:46

    i found it on line.
    should i be more clear on my question . I know it is ok for 300b but is this any good ?
    as other said I might be go for current reg instead or should this one is a fine one ?
    Cheers
    LT
    

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    • RE: Did you find this online or design it yourself? - slownlo 18:36:10 11/06/09 (0)
      In Reply to: RE: Did you find this online or design it yourself? posted by lovetube on November 06, 2009 at 18:17:35

      Yes, Its "good"....but like Chris-O said, a current reg is better to use...
      

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• RE: is this reg ok for 300b Fil ? comment please - Chris O 17:32:42 11/06/09 (0)
  In Reply to: RE: is this reg ok for 300b Fil ? comment please posted by lovetube on November 06, 2009 at 17:02:06

  Better to use a current reg than a voltage reg. You can use a LT1085 "floating" with a +or- 1 ohm resistor between the output and adjustor legs.
  
  ___
  Long Live Dr.Gizmo
  
  
  
  

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