• RE: ST-70 rectifier - truep 08:13:43 09/26/13 (0)
  In Reply to: RE: ST-70 rectifier posted by craigh on September 09, 2013 at 14:34:06

  the 5Y3 won't cut it in an ST-70. not rated for the required current.
  

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• RE: ST-70 rectifier - petercapo 16:56:10 09/09/13 (1)
  In Reply to: RE: ST-70 rectifier posted by craigh on September 09, 2013 at 14:34:06

  Dynaco specified the 5AR4 with the 5U4 as an option. With the 5U4, I believe you'd get a bit less power from the amp and a harder startup.

  As far as any other kind of rectifier, some might work. You'd want to look up the datasheets for both the 5AR4 and the 5Y3S and compare the operational parameters such as forward voltage drop, current handling capabilities, filament current draw, pin out diagram, so forth and so on.

  If the 5Y3S has a greater forward voltage drop, then the amp will produce less power. If its current and PIV ratings are less than the 5AR4 or 5U4, then anything from a shorter life to quick failure could result. If the pin-out/internal configuration is different from the 5AR4/5U4, then don't use the 5Y3S. Those are the operational parameters that come to mind, but there are probably other considerations, as well.

  I just Googled 5Y3S datasheet and came up empty. I wouldn't risk it. It's easy to get an inexpensive Sovtek or Chinese 5AR4. An old stock 5AR4, new or used-good, would be better than a current production 5AR4 but could also be a lot more expensive. You could also look at the Ruby, TAD and RAM Labs 5AR4 which are cherry-picked Chinese 5AR4s. If you try a current production 5AR4 and find it arcs/fails too soon, try the mod at this link:
  

  • http://dynacotubeaudio.forumotion.com/t1006-tube-rectifier-d   (Open in New Window)

  
  

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  Edits: 09/09/13   09/09/13   09/09/13   09/09/13   09/10/13   09/10/13   09/10/13   09/26/13   09/27/13   09/27/13   09/27/13   09/27/13   09/27/13   09/29/13

  • RE: ST-70 rectifier - craigh 18:25:23 09/09/13 (0)
    In Reply to: RE: ST-70 rectifier posted by petercapo on September 09, 2013 at 16:56:10

    Thanks
    
    Craig
    

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