Hello .
I have a Technics su-8080
There is any problem if the main PSU power caps having 10000uf are having 1,5% V-loss ?.
I don't think is a great idea to play the amp for to long ?.
Seems risky ?.
Should I also expect other parts to fail or the amp will have no problems with that V-loss for short period of use ?
I've read that for 10000uf the V-loss should be 0,01 % but I think this is the ideal value .
I have a Technics su-8080
There is any problem if the main PSU power caps having 10000uf are having 1,5% V-loss ?.
I don't think is a great idea to play the amp for to long ?.
Seems risky ?.
Should I also expect other parts to fail or the amp will have no problems with that V-loss for short period of use ?
I've read that for 10000uf the V-loss should be 0,01 % but I think this is the ideal value .
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ESR is equivalent series resistance, that's a well know parameter. I've never heard of V-loss and can't even turn up any useful info on that.
This was all I found:
http://www.foxcomputer.se/Capacitor voltage loss Vloss.pdf
Testing how 'good' a large electrolytic is would be done by looking at something called 'Tan Theta'.
https://www.illinoiscapacitor.com/pdf/Papers/impendance_dissipation_factor_ESR.pdf
This was all I found:
http://www.foxcomputer.se/Capacitor voltage loss Vloss.pdf
Testing how 'good' a large electrolytic is would be done by looking at something called 'Tan Theta'.
https://www.illinoiscapacitor.com/pdf/Papers/impendance_dissipation_factor_ESR.pdf
Dear Mooly!
there are existent small cap multimeters which can measure ESR and V-loss. If I remember correct V-loss is a kind of difference between the voltages during charging and uncharching of the cap under testing cycle.
someone please correct, if I am wrong🙄
Thanks Pawel. I still can't find anything on this as being a recognised and testable parameter though.
I couldn't find anything concrete, but there are a few hints that Vloss is just dissipation factor expressed as a percentage.
I read some articles they claim 10000uf should be in the 0,1% range mentioning that 1,5% is considered defective .
I read some articles in the past claiming that v-loss means escape current if a cap have 22uf and 3% v-loss means 3% will pass unfiltered at a higher uf range out uf 22uf range ?
So if the main psu power caps having 10000uf if they have vloss of 10% the amp will go strong another few years ?😕
Or will go dead farting a strange noise like the last breath ?
Or will go dead farting a strange noise like the last breath ?
how did you measure the voltage loss? I have one of those $10 mega328 LCR testers that gives a V-loss measurement but I never really paid any attention to it. I just tested a 25 year old 10000uf/63v psi capacitor I pulled from an old Exposure integrated amp and I got the results shown in the pic. I’m assuming the OP has a similar tester and that is what he is talking about when he says Voltage loss.
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I wouldn’t pay much attention to the “Vloss” measurement you get from one of these cheap testers.
I too have never heard of V-loss. I have heard of DF, DA, ESR. Maybe V-loss is some figure of merit invented by cheap meter makers because it is easy to measure but fairly meaningless?
I was curious so I tested a brand new 470uf/35V Panasonic FC and a 47uf/25V Elna Silmic2. The cheap tester showed a VLoss of 1.1% and .9%. I would take the Vloss reading from these Mega328 testers with a grain of salt.
Never heard of it before, but much worse, although a couple pages mention it, I couldn´t even find a good, consistent *definition* of it.
Here's an article:
"A bad capacitor is an electronics component that over the course of its life has turned to the dark side. It is evil now and is no longer serving its intended purpose in life.
A voltage loss of 34% is terrible! This part is leaking electricity like a sieve.
Vloss is the amount of voltage the meter has measured that the capacitor has lost.
This part is leaking electricity like a sieve. Which is not what capacitors are supposed to do at all. Quite the opposite in fact. Capacitors are supposed to be able to store electricity. They are supposed to have the capacity to store an electrical charge. Hence their name. The ESR measurement is pretty bad too, but not nearly as out of spec as the Vloss."
I think bad Vloss is electricity that escape unfiltered ? so the bigger the V-loss the bigger the chance the cap will act like a good conductive wire ?.
A Vloss of 80% will be almost like a perfect conductive wire ?
So a cap os 10000uf having a Vloss of 2% means some serious unfiltered current that is escaping creating overheat and maybe damage to other components?
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sounds sane
but Vloss=1,1% for new FC caps???
maybe the Vloss is good parameter for estimating the cap's condition, but this dmeter measures it with too high error?
but Vloss=1,1% for new FC caps???
maybe the Vloss is good parameter for estimating the cap's condition, but this dmeter measures it with too high error?
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