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"International" capacitors

Discussion in 'Electronic Repair' started by pk, Apr 4, 2007.

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  1. pk

    pk Guest

    I am looking for International capacitors info,
    On the cap is written: Japan, International, C.
    They might be vintage
    They came with a Fenter amp from the USA
    80 Uf 450 volts
    20 Uf 450 volts
    I have pics of them.
    Thank you Peter Kluken
  2. Guest

    sounds kinda like you have the relevant info already.

  3. Sofie

    Sofie Guest

    Unless you are looking for "exact" mechanical replacements which may be next
    to impossible and new electrolytic capacitors of the same Uf and voltage
    rating will work perfectly and they will probably be much smaller that the
    older originals. The values that you mentioned are not that hard to find
    but you while the 450 V voltage rating may be common you may have to sub a
    22 Uf for the 20 Uf unit and possibly an 82 Uf or even a 100 Uf for the 80
    Uf unit.... should not be any kind of a problem with the sub values since
    most electrolytics have a fairly wide tolerance rating.
    Daniel Sofie
    Electronics Supply & Repair
    - - - - - -
  4. Eeyore

    Eeyore Guest

    What exactly do you want to know ? The name rings no bells with me. That company
    may either have gone bust or merged with another.

    Are you one of those clowns who think that PSU caps have to be so authentic as
    to come from the same batch lest the sound of the guitar will change ?

  5. pk

    pk Guest

    I asked this question because the International caps perform, sound and feel
    much better than Mallory and Sprague Atom in a Fender Blackface Twin, I dont
    know why.
    Printed on the caps : HTD : High Temperature Dynamics( for high temperature)
    Could this affect the feel and sound in a Fender Twin amp?
    Thanks Peter.
  6. pk

    pk Guest

    No Graham, i am not that type of clown.
    I asked this question because the International caps perform, sound and feel
    much better than Mallory and Sprague Atom in a Fender Blackface Twin, I dont
    know why.
    Printed on the caps : HTD : High Temperature Dynamics( for high temperature)
    Could this affect the feel and sound in a Fender Twin amp?
    Thanks Peter.
  7. James Sweet

    James Sweet Guest

    This is one of those things audiophools will argue endlessly on. Really
    so long as the rating is correct there should be no difference at all
    between one capacitor and another. "High Temperature Dynamics" sounds
    like meaningless marketing speak.

    Have you tried Mallory and Sprague caps yourself? They're well known
    brands with a quality product that should perform as well as anything,
    I'm curious as to how they sound or "feel" inferior.
  8. all capaciters are internationel. they don' make capaceters in the
    united states.
  9. Guest

    Its easy to form these opinions from listening tests, but it doesnt
    make it reality. Get a couple people to run a double blind test for
    you and you'll not be able to tell which is which.

  10. pk

    pk Guest

    Mallory and Spraque have a more stiffer feel , touch, some runs are
    difficult to play, they might be too good?
  11. Guest

  12. Guest

    BS ALERT: The electrolytic cap values you mentioned are most likely B
    + Filter Caps and are absolutely not involved in audio stage coupling
    functions where someone "may" have a very very small argument
    regarding types of caps affecting the objective (not measureable)
    sound quality.
    Take Sofie's advice and just replace them and no one will know the
    difference except you of course.... and you will continue to think
    that the sound is not what it should be. This is a mental thing....
    get a grip and get over it.
    I bet you also believe that your interconnecting cables and speaker
    wires have to be bi-radially wound, oxygen free copper, 06 guage with
    gold connectors @ $15 per foot.... and on a blind A/B test you could
    not tell the difference if someone substitued cheapo cables and wire
    on typical length cable runs.
  13. Guest

    I wish I had the "international caps" you are looking for.... I could
    make some real money here.

    "stiffer feel"
    read between the lines...... "snake oil"
  14. James Sweet

    James Sweet Guest

    Huh? The whole point of a filter capacitor is to "stiffen" the power
    supply, filtering out the ripple. If you want a less effective
    capacitor, put a resistor in series with it. I think the difference is
    all mental though.
  15. Eeyore

    Eeyore Guest

    In order for there to be a difference, audible or otherwise, you'd have to
    provide a meaningful explanation of why one company's microfarads behave
    differently to another company's microfarads !

    And *then* additionally why the caps in the power supply would be audible in the
    sound. It's not as if they're in the direct signal path !

    Have you actually considered measuring their value ? I wouldn't mind betting
    that the caps you're saying sound better have actually dried out and their value
    is a fraction of the value printed on the can. That *would* affect the
    amplifier's dynamics. You could mimic that effect by using new caps of lower
    value than original.

  16. Eeyore

    Eeyore Guest

    I suggest you address yourself to the issue of this 'better sound and feel' and
    what exactly you mean by it.

    I'd almost put money on those International caps being a fraction of their
    original value. This is what happens to electrolytics over time. By replacing
    them you're restoring the amplifier to original condition and you no longer like
    that sound.

    I can assure you that 'back in the days' when your amp was designed, no-one
    believed in capacitors having any special sonic effects so you can be sure they
    weren't chosen for that reason.

    Do you have a capacitance meter ?

  17. Eeyore

    Eeyore Guest

    I'll bet you that the original caps have lost value through ageing.

  18. Eeyore

    Eeyore Guest


    I've been dealing with this issue only this week. There was a guy who was
    convinced that his guitar amps only hummed in this particular recording studio. We
    measured everything inside out but he wasn't happy so we took the amp to another
    location where it measured exactly the same again.

    It sounded different of course due to the changed acoustics. Apparently My Guitar
    Tech can't understand that.

  19. Eeyore

    Eeyore Guest

    Now you've proven yourself to be barking mad. Do please explain how the
    capacitors make it difficult to play !

    Look, have a good night's sleep and start again.

  20. Eeyore

    Eeyore Guest

    It's entirely possible that the new caps actually measure the originally required
    80uF whilst the old ones may be as little as 20uF due to ageing (mainly drying

    That will affect how the amp's dynamics sound when they are replaced by ones of
    the 'correct' value.

    The OP could try say 47uF or 22uF in place of the 80uF to see how it sounds. This
    will introduce a danger of the amp 'motorboating' though.

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