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Wednesday, October 18, 2017

Power Supply with ELROG ER274A

Hi!

Here some photos of the first power supply I built for the ER274A rectifier.




The owner of one of the sets of 211/211 amplifiers requested to convert the power supplies to use the new ELROG rectifier. How could I say no to that?




Two of the TV Dampers got replaced by the directly heated rectifiers. Two TV dampers remained for a slow ramp up of the high voltage.




Now not only the amplifier sections exhibit the bright thoriated tungsten glow, but the power supplies as well.




Not sure yet if I even prefer this to the blue glow of the mercury vapour PSUs.




Quite spectacular light show!




Amp section and PSU side by side:




The gap between the two plates gives a nice view to the filament.




Best regards

Thomas



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4 comments:

  1. AnonymousOctober 19, 2017 at 1:02 PM

    Hello Thomas,
    How come that the 274 A rectifier complies with the high voltage required by 211 power tubes ( 1000-1300V DC)?
    Thanks
    Phil

    ReplyDelete
    Replies
    1. VinylSavorOctober 19, 2017 at 4:49 PM

      Hi!
      The Elrog ER274A can handle higher voltages. But in this PSU they are part of a bridge configuration which has less peak reverse voltage across the tube

      Delete
  2. DanielOctober 21, 2017 at 7:40 PM

    Are the two anodes of each 274 parrelled?

    ReplyDelete

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