1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Is STV-3H same a STV-3 ?

Discussion in 'Pioneer Audio' started by qguy, Jul 11, 2018.

  1. qguy

    qguy Super Member

    Messages:
    1,307
    Location:
    Manila, Philippines
    Is STV-3H same a STV-3 ?

    it has "5N" printed on it.

    Physically looks the same
     

    Attached Files:

     

    Please register to disable this ad.

  2. Watthour

    Watthour Electron Rancher - JS3600

    They have been referred to as STV3, STV-03H, STV-3H, STV-3, STV-3H-YG, STV-3H0, and probably numerous other names. AFAIK, they are all in reference to the Sanken STV3H-Y diode array.

    You might get lucky and find NOS parts somewhere, or make your own. Since you have an example already, protect it like it was gold.
     
  3. john stumpf

    john stumpf AK Subscriber Subscriber

    Messages:
    669
    Location:
    philippines
    not trying to horn in but you mentioned the diode 1004 combo to me in the sx9000 thread, how does that work out in actual practice?
     
  4. Watthour

    Watthour Electron Rancher - JS3600

    If you read that entire thread (seven pages) there is quite a bit of information from practice. Colloquial evidence from practice seems to indicate that the string of UF1004s seems to track fairly well.
     
  5. john stumpf

    john stumpf AK Subscriber Subscriber

    Messages:
    669
    Location:
    philippines
    good to know, thank you.
     
  6. qguy

    qguy Super Member

    Messages:
    1,307
    Location:
    Manila, Philippines
    Before I buy it, I would like to test it, how do I test this part if it is good?
     

     

    Please register to disable this ad.

  7. john stumpf

    john stumpf AK Subscriber Subscriber

    Messages:
    669
    Location:
    philippines
    like a regular diode. if your using a diode tester the forward will be 2-3 times higher.that looks unused,you find that in manila?
     
  8. qguy

    qguy Super Member

    Messages:
    1,307
    Location:
    Manila, Philippines
    Yup, Friend of mine has it, it is NOS :)

     
    Last edited: Jul 12, 2018
  9. Hyperion

    Hyperion Roobarb & Custard Subscriber

    Messages:
    48,611
    Location:
    Hertfordshire, UK
    Take care of the leads - they can be extremely fragile and break off very easily.
     
  10. john stumpf

    john stumpf AK Subscriber Subscriber

    Messages:
    669
    Location:
    philippines
    yeah they can, sort of makes a guy think that NOW is the time to modify with stranded wire.
     
  11. rcs16

    rcs16 Super Member

    Messages:
    4,067
    Location:
    Baldwin, Ontario, Canada
    I glue the braided insulation/wire to the body to act as a strain relief.
     

     

    Please register to disable this ad.

  12. LesE

    LesE 110284 Subscriber

    Messages:
    877
    Location:
    Ontario, Canada
    For info ... I took some V-I measurements to compare an original STV-3H diode against a new STV that is available on eBay. The new ones appear to track quite well with the originals. I've used a few of them and they seem to work fine.

    STV-3H-A.jpg
     
    kevzep, SolderIron and mbz like this.
  13. kevzep

    kevzep Its all about the Music Subscriber

    Iv'e used some STV3 diodes from a bay seller in Germany, I am not sure it they make them or if they are NOS, but they look brand new and seem to work well.
    In fact today I put one in the SX1250 I am working on.
    Lead just fell off one as I was about to fire it up!!
    The last tech was pretty rough with this amp, and I suspect this was something to do with some of the issues..

    But yeah, those German ebay ones are great, not a bad price too.
     
    slimecity likes this.
  14. aldena007

    aldena007 Legacy Audio Aficionado

    Messages:
    252
    Location:
    Tucson, AZ
    As of today (7-15-18) he has only 310 left. He has sold 990 to date so those German diodes are going fast! Get them while you can. Others are selling (or trying to) with an asking price upwards $30.00 a pair. I don't think he has an unlimited supply but his price is around $7 plus shipping so get a few extras.
     
  15. qguy

    qguy Super Member

    Messages:
    1,307
    Location:
    Manila, Philippines
    Mine is reading around 1200 on my DMM on the diode setting

    [​IMG]
     
  16. kevzep

    kevzep Its all about the Music Subscriber

    I just measured my new German STV3's and they have a forward voltage of 1.495V.
     

     

    Please register to disable this ad.

  17. john stumpf

    john stumpf AK Subscriber Subscriber

    Messages:
    669
    Location:
    philippines
    thats sounds reasonable to me, when was your meter or mine last been to a calibration lab?
     
  18. markthefixer

    markthefixer On Hiatus, dealing with Dad's estate full time Subscriber

    Messages:
    21,124
    Location:
    Bensenville,Illinois
    the forward voltage is dependent upon the temperature (of course!!) but ALSO the test current through it. Different meters have different test currents PLUS the battery condition of the meter at that time has an influence.

    The factory pushes through 7 mA at a standard temperature for the rating. And even it is expressed as a range.
     
    I LIKE MUSIC likes this.
  19. pustelniakr

    pustelniakr Silver Miner at Large Staff Member Super Mod Moderator Subscriber

    Messages:
    7,659
    Location:
    Tucson, AZ
  20. pustelniakr

    pustelniakr Silver Miner at Large Staff Member Super Mod Moderator Subscriber

    Messages:
    7,659
    Location:
    Tucson, AZ

Share This Page