+ Reply to Thread
Results 1 to 6 of 6

Thread: Failed NOS valves... ?

  1. #1
    Join Date: Nov 2014

    Location: London

    Posts: 24
    I'm Tim.

    Default Failed NOS valves... ?

    Hey all,
    Just wondering how many of these you've seen not valves that are not working when new (NOS)? I've had two from Ebay that measure well (apparently) but now have to go back. I don't see the sellers as dishonest as they have to take things back so it wouldn't benefit them. So far I'm 2 out of 4 with a lot of distortion!

    Cheers, Tim

  2. #2
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,029
    I'm Alex.

    Default

    Something I had not considered until recent years, if NOS valves have been stored badly, say damp conditions, The pins can corrode, affecting the glass to pin seal, and hence affecting the valve.
    Spendorman

  3. #3
    Join Date: Mar 2017

    Location: London N2

    Posts: 1,715
    I'm Edward.

    Default

    Quote Originally Posted by spendorman View Post
    Something I had not considered until recent years, if NOS valves have been stored badly, say damp conditions, The pins can corrode, affecting the glass to pin seal, and hence affecting the valve.
    As part of my routine I will take a bit of fine sandpaper and rub the pins of valves lightly so as to eliminate corrosion as a possible cause of distortion etc. No harm done and only takes a very short while.
    Main: Tidal/Roon > MiniITX > Metrum Hex > LDR > either Radford STA25 V or Trilogy 968 > Tannoy (Eaton or Berkeley).
    2nd: Tidal/Roon > Roopio on Pi > Chevron Paradox > Firebottle Buffer > Sugden Masterclass IA-4 > Kudos Cardea


  4. #4
    Join Date: Mar 2008

    Location: Dunfermline, Scotland, UK

    Posts: 12,825
    I'm inthescottishmafia.

    Default

    A good trick with small valves is to stand them in a saucer and fill up to the top of the pins with Coca Cola. Leave overnight, pins will be bright and clean the next day.
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

  5. #5
    Join Date: Nov 2014

    Location: London

    Posts: 24
    I'm Tim.

    Default

    Awesome advice. Thanks all.

  6. #6
    Join Date: Apr 2012

    Location: London

    Posts: 599
    I'm James.

    Default

    Or use a glass fibre pen, less aggressive than sandpaper. Cheap on amazon

    Sent from my BLA-L09 using Tapatalk

+ Reply to Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •