34uf cap
DeRod
Posts: 131
That’s a Jantzen 18uf + 16uf
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
Comments
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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. -
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 -
slow_polk7 wrote: »
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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So the 16uF Jantzen cross cap is out of spec (Jantzen says ±5%)
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Yeh the other one read 15.19uf
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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 -
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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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 -
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. -
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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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. -
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 -
That old 34uf I measured it with both meters and every time it’s close but never the same
38.98uf on the DATS
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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 -
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. -
(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? -
That’s from the instructions that came with the meter -
(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
