34uf cap

DeRod
DeRod Posts: 230
in Vintage Speakers
q7cvxvb39a47.jpeg

That’s a Jantzen 18uf + 16uf

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Jantzen 18uf + 16uf + 1uf

I had on my 7B’s a 33uf + 1uf audyn caps and I removed the the 1uf to see if I noticed a difference. I think it sounded better with the 1uf

I’m thinking to add the 1uf to the 7Cs that have the 18+16 caps to see how that sounds.

Any thoughts? I know the 1uf caps are hated but I still don’t get it
"Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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Comments

  • slow_polk7
    slow_polk7 Posts: 52
    DeRod wrote: »
    q7cvxvb39a47.jpeg

    That’s a Jantzen 18uf + 16uf

    Have you measured the caps individually? If so, what do they read?

    As to the whole 1uF debate -- some claim to hear unwanted artifacts -- if you don't, then I wouldn't be concerned.
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  • F1nut
    F1nut Posts: 51,657
    The small cap acts as a bypass cap. Bypass caps impart artifacts, which one would notice in the higher frequency ranges. Since the 34uF is a shunt cap I doubt the artifact issue would come into play.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • DeRod
    DeRod Posts: 230
    slow_polk7 wrote: »
    DeRod wrote: »
    q7cvxvb39a47.jpeg

    That’s a Jantzen 18uf + 16uf

    Have you measured the caps individually? If so, what do they read?

    As to the whole 1uF debate -- some claim to hear unwanted artifacts -- if you don't, then I wouldn't be concerned.

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    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • slow_polk7
    slow_polk7 Posts: 52
    So the 16uF Jantzen cross cap is out of spec (Jantzen says ±5%)
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  • DeRod
    DeRod Posts: 230
    Yeh the other one read 15.19uf
    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • F1nut
    F1nut Posts: 51,657
    The Cross Cap isn't that good. The Superior Z is the one to get.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • msg
    msg Posts: 10,450
    Are those all out of spec, normal to see them measure like this, or is the meter off?
    I disabled signatures.
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  • F1nut
    F1nut Posts: 51,657
    edited March 15
    The only one that is truly sucks is the black with red ends Temple cap, but the original tolerance was likely +/-20%. They were horrible from the get go.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • DeRod
    DeRod Posts: 230
    edited March 15
    msg wrote: »
    Are those all out of spec, normal to see them measure like this, or is the meter off?

    Meter is good. The ones out of spec are the old black and red 34uf, like F1 pointed out. The 16uf are slightly out of spec also.

    I got the DATs as well to play around with. The DATs gives you a lot more info but the handheld meter is super convenient.
    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • msg
    msg Posts: 10,450
    I guess what I meant to ask was, does a brand new capacitor measure exactly as specced, or is it normal for them all to be off a little bit, within their tolerance?
    I disabled signatures.
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  • VR3
    VR3 Posts: 29,383
    edited March 16
    In my experience nicer caps are always within 1% but it's very rare for it to measure exactly 100% at value. It will always be 12.xx or 11.xx on a 12uf never 12.00

    I've seen alot of resistors measure exact

    Inductors are always higher than the value but within spec
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • pitdogg2
    pitdogg2 Posts: 26,915
    edited March 16
    msg wrote: »
    I guess what I meant to ask was, does a brand new capacitor measure exactly as specced, or is it normal for them all to be off a little bit, within their tolerance?

    Most of the better capacitors are 1% to 5% +/- tolerance, so they will be right on the money or within the specified tolerance brand new. Many sellers will match caps to a specced value for a fee.

    I agree with @VR3. I've always considered right on the money if the cap was less than 1%. So a 20uf cap that measures 20.06 or something close was on the money.
    Post edited by pitdogg2 on
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  • DeRod
    DeRod Posts: 230
    ozn82qfet2dl.jpeg

    That old 34uf I measured it with both meters and every time it’s close but never the same

    38.98uf on the DATS
    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • Gardenstater
    Gardenstater Posts: 4,720
    edited March 18
    So that old 34uF electrolytic was ESR 0.8714 Ohms and DF 20.3% at 1kHz? Totally shot. What's the ESR and DF measurements on the new caps?
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • DeRod
    DeRod Posts: 230
    Yeh that old 34uf is totally shot. I can re test it on either meter and the results are never the same.

    I’m going to use my super triple 34uf cap to recap a pair of M5Bs that have electrolytic caps. I’ll test the old caps each as I remove them to see the before and after.

    I’ll probably get started tonight and post some pics.
    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • Schurkey
    Schurkey Posts: 2,122
    edited March 22
    q7cvxvb39a47.jpeg
    (Tried to insert a photo from first post. Can't make it work.)

    I am not an expert. My ancient capacitor meter has selectable test frequency. What is the industry-standard test frequency for audio caps? What frequency does your meter use?
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  • DeRod
    DeRod Posts: 230
    5grgbkwj3oud.jpeg

    That’s from the instructions that came with the meter
    "Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb.
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  • Gardenstater
    Gardenstater Posts: 4,720
    Schurkey wrote: »
    q7cvxvb39a47.jpeg
    (Tried to insert a photo from first post. Can't make it work.)

    I am not an expert. My ancient capacitor meter has selectable test frequency. What is the industry-standard test frequency for audio caps? What frequency does your meter use?

    I've wondered this myself and now that it is on my radar I've noticed that very few manufacturers that are marketing caps as being for audio are even specifying ESR or DF, let alone at what frequency.

    Polk did specify on the schematics for Series II caps, both mylar and electrolytic, DF less than or equal to 3% @ 1kHz, so I think we should use that as a guide. DF seems especially frequency dependent.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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