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Where can I find a replacement EHT diode ?

Discussion in 'Electronic Repair' started by Nick, Dec 16, 2006.

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  1. Nick

    Nick Guest

    My Gould scope has died, it seems that the EHT supply has died. This is a
    2.5kV rail supplied from a 950V secondary and a charge pump. The diodes
    appear to be blown (I set my variable PSU current limit to 20mA then wound
    up the voltage to measure Vf - the PSU goes up to 30V, there can't be THAT
    many junctions in a package 10mm long!)

    The scope manual lists them as "IJK60TR 6kV"

    Some Googling suggests FM50 or SL1200, but I can't find them either. In fact
    diodes with this voltage rating seem quite rare. I know I could stack some
    lower voltage diodes (and bleed resistors) but space is a bit limited.

    Can anyone suggest a replacement, or supplier in the UK?

    Thanks
    Nick
     
  2. N Cook

    N Cook Guest

    Don't replace with seriesed high current diodes, part of the function of
    these diodes seems to be a fuse to protect transformer over-windings from
    downstream problems.
     
  3. Baron

    Baron Guest

    That IJK60TR part no: sounds a bit microwave oven'ish.
     
  4. t w

    t w Guest

     
  5. t w

    t w Guest

     
  6. Cheemag

    Cheemag Guest

  7. t w

    t w Guest

    Sorry & yes. I've found them very helpful
     
  8. Nick

    Nick Guest

    Thanks both, interesting site. One component seems to fit the bill
    (SKV1/2B3000/2700-1.2) though it's listed as POA. I'll give them a call on
    Monday. I just hope they're not a silly price or minimum order qty as I can
    get a replacement 'scope for 75 quid...

    Nick
     
  9. Cheemag

    Cheemag Guest

    If that fails, then you can try the string of diodes suggested further
    up the log. Should work.
     
  10. If all else fails find an old 1970s B&W TV and steal it's HV inline
    diode (LOPT HV diode to you folks across the pond). Or an early
    computer green screen monitor.

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
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