Vintage Asylum

RE: Help needed: 4uF PIO capacitor (Hunts) sought, or PIO replacements?

108.67.99.125

Steve O

In Reply to: RE: Help needed: 4uF PIO capacitor (Hunts) sought, or PIO replacements? posted by jusbe on February 26, 2015 at 20:00:26

Would you consider something more modern than PIO? If so, the current rage is the "DC link" cap. Metalized polypropylene and various values @ 600-630VDC and greatet. Avail from the usual sources.

Follow Ups:

Maybe? Drastically different? - jusbe 21:50:44 02/26/15 (3)
The PIO preference is in deference to the original design. Not sure what a DC-link cap is? My bigger concern is how much it may change the sound...?
Big J

"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
- RE: Maybe? Drastically different? - Michael Samra 23:14:27 02/26/15 (2)
  You want to stick with the paper in oil to at least maintain some semblance of the original sonic structure.There are very good caps as well in other types,but I think this one here is going to be what you want and it has the same shape as your original from what I can see.
  "If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
  
  - Daniel R. von Recklinghausen
  - http://www.ebay.com/itm/4-uF-630-V-STRONG-MATCHED-RUSSIAN-PA (Open in New Window)
  - RE: Maybe? Drastically different? - Audio Mind 13:37:00 02/27/15 (1)
    I have used those Russian caps in the link and generally like them better than most plastic caps out there even some expensive plastic caps.
    
    I think they even give some of the newer paper caps like the fairly pricey Jensen PIO caps a run for the money and the cost is so reasonable on the Russian caps you will be very pleased at the price/performance ratio.
    
    Looking at the rest of your amp I would say those Russian caps would not be out of place sound wise.
    
    Just make sure they are going to fit as the square form is a little weird.
    - RE: Maybe? Drastically different? - Michael Samra 17:59:46 02/27/15 (0)
      AM
      I agree wholeheartedly with everything you said. Since I posted that,he posted the schematic and once he did that,you can see the 4uf was the charging cap in the power supply.I think the one he has in the amp is fine.The way he talks is like he may have a tube glowing problem and in that case the coupling caps,C7 and C8 are suspect.
      "If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
      
      - Daniel R. von Recklinghausen

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