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    better suited resistors

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    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    better suited resistors

    Post by MontanaWay on Tue Mar 18, 2014 12:04 pm

    A general question.
    What material/type of resistor is best suited for tube audio circuits, metal film, carbon etc., your advise would be much appreciated, thanks.

    PeterCapo

    Posts : 386
    Join date : 2008-12-05

    Re: better suited resistors

    Post by PeterCapo on Tue Mar 18, 2014 12:24 pm


    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: better suited resistors

    Post by MontanaWay on Tue Mar 18, 2014 12:35 pm

    thanks....next time I do a search!!  Shocked 

    PeterCapo

    Posts : 386
    Join date : 2008-12-05

    Re: better suited resistors

    Post by PeterCapo on Tue Mar 18, 2014 6:24 pm

    Not a problem.  Actually, for some reason, I have difficulty using the search feature here...  Is there a trick to it, I wonder?

    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: better suited resistors

    Post by MontanaWay on Tue Mar 18, 2014 6:26 pm

    PeterCapo wrote:Not a problem.  Actually, for some reason, I have difficulty using the search feature here...  Is there a trick to it, I wonder?

    yeah, post a question here instead!! LOL

    tubes4hifi
    Admin

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    Join date : 2008-11-30

    Re: better suited resistors

    Post by tubes4hifi on Tue Mar 18, 2014 10:15 pm

    metal films are usually the best for 1/2 watt or less resistors used in the audio signal path.
    metal oxide resistors are usually the best for 1 to 3 watt resistors used in the power supply or in a plate load.
    carbon films are OK if you want that old mellow tone from the 60s. carbon composition are rarely used anymore for anything audiowise.
    There are other types of resistors, such as wire-wound, that are used when needed for high current and low resistance.
    If you like to pay $4 each for a resistor when a 10c Vishay/Dale metal film is perfectly fine for 99.99%, then you'll like tantalum film resistors.
    20 or 30 of those can really up the budget!!
    You didn't ask, but I only use polypropylene capacitors in the audio path. Never use polyester capacitors for anything, in my opinion!
    PP caps are normally metalized film, but better ones are made with foil and cost more (that's the difference between the Sprague 715P and 716P).
    Even better are paper in oil (PIO) and better yet are Teflon which are usually over $100 each, if you don't care for standard $2-5 capacitors.

    Bob Latino
    Admin

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    Join date : 2008-11-26
    Location : Massachusetts

    Re: better suited resistors

    Post by Bob Latino on Wed Mar 19, 2014 9:14 am


    The original poster asked only about resistors and I don't mean to hijack the thread but maybe a continuation of what Roy has said above ..

    I agree with everything that Roy has said BUT > The Teflon caps that he mentioned are really nice sounding but Teflon caps tend to be very large for their size and voltage rating and in many cases will not fit into the area that you would want to use them. In any of the VTA amp kits they are just too large to fit unless you suspended them somehow above the board. See photo below. In small cramped areas the Auricap works well. Two of the Russian PIO caps are also shown below. The metal cased  K40-Y and the green epoxy coated K42-Y ... The K42-Y is a later series and these are smaller for their size and voltage rating than the K40-Y. Many people like the K40-Y's better because they are larger and "bigger is better" right ? The K42's are smaller and IMHO sound the same as the K40-Y's. I use the K42's in my own ST-35 because they fit the (smaller) area found on the ST-35 driver board better. The epoxy coating on the K42-Y's prevents the outer case from shorting board components together. This is an issue you have to deal with when you use the K40's ..



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