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Electrolytic Capacitors With Higher Stamped Value
Electrolytic Capacitors With Higher Stamped Value
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Old 13th September 2018, 11:29 AM   #11
Michael 5of9 is offline Michael 5of9  United Kingdom
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Question Capstan Motor Bipolar “NP” electrolytic capacitor 15μf 16v redial

On a Philips cassette deck there is a Capstan Motor; with a bipolar type “NP” electrolytic capacitor 15μf 16v redial fitted.

Electrolytic Capacitors With Higher Stamped Value-capstan-motor-cap_6660-jpg

Electrolytic Capacitors With Higher Stamped Value-capstan-motor-cap-jpg

I was thinking about replacing this cap; however looking on eBay, finding a 15μf cap has proved to be a challenge

I haven’t remover and tested because it is heavily/well soldered and likely to cause damage to the cap
Attached Images
File Type: jpg Capstan Motor Cap_6660.jpg (179.1 KB, 193 views)
File Type: jpg Capstan Motor Cap.jpg (120.8 KB, 193 views)
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Old 15th September 2018, 03:02 PM   #12
glennb is offline glennb  Australia
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Go up to 22uF. Higher voltage rating would also be OK.
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Old 22nd September 2018, 11:44 AM   #13
Michael 5of9 is offline Michael 5of9  United Kingdom
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Post Becoming More Clearer

Quote:
Originally Posted by glennb View Post
Go up to 22uF. Higher voltage rating would also be OK.
Thank you Glenn for that; could I kindly ask for your thoughts on this, the higher 22μf cap to gain more understanding, thanks?

A very good day to you all and thank you for your valuable comments, well appreciated; it has become clearer now.

Electrolytic Capacitors With Higher Stamped Value-electrolytic-capacitor-specs-jpg

Electrolytic Capacitors (cap) have a life span of around 1000 hrs; with this in mind, the higher readings are most likely acquired because of leakage from the old cap, as some suggests.

With this in mind; it would make sense to replace them all, whilst the job is in hand. Below you can see the new cap and it’s capacitance reading.
Attached Images
File Type: jpg Electrolytic Capacitor Specs.JPG (33.4 KB, 78 views)
File Type: jpg New 100uf Vishay Axial.jpg (46.7 KB, 14 views)
File Type: jpg New 100uf reading.jpg (91.6 KB, 18 views)
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Old 22nd September 2018, 01:45 PM   #14
cliffforrest is offline cliffforrest  United Kingdom
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"Electrolytic Capacitors (cap) have a life span of around 1000 hrs ..."

Please think about that! If true then all elkos would need replacing 3 or times a year in ALL of your electronic equipment!
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Old 22nd September 2018, 02:21 PM   #15
jan.didden is offline jan.didden  Europe
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In the old days, when manufacturing was not as refined as it is now, electrolytics were often value tolerance specified as "-50%/+100%". Although that 247uF is really something else.

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Old 22nd September 2018, 05:11 PM   #16
Michael 5of9 is offline Michael 5of9  United Kingdom
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Quote:
Originally Posted by cliffforrest View Post
"Electrolytic Capacitors (cap) have a life span of around 1000 hrs ..."

Please think about that! If true then all elkos would need replacing 3 or times a year in ALL of your electronic equipment!
I bought this new in the early 1980's; it's the first time around for renewing the elkos.

I replaced many elkos in an amplifier; which really improved the sound quality, about 4 years ago of the same age, this impressed me to continue and do the same in this unit.
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Old 22nd September 2018, 05:32 PM   #17
cliffforrest is offline cliffforrest  United Kingdom
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? So why state that there is a lifespan of 1000 hours?

Where did you get that info from?
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Old 22nd September 2018, 06:15 PM   #18
DF96 is offline DF96  England
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If you look carefully it says 1000 hours at 85C. Run it cooler and it will last longer. Also, this is what the datasheet says; it is probably a minimum spec so most production caps will last longer than this. It is also probably a 'running' spec, so hours switched off don't count. Take this all together and you find that a cool electrolytic can last many years. 10, 20, 30 years are possible in a non-critical circuit position in domestic audio.
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Old 22nd September 2018, 06:32 PM   #19
cliffforrest is offline cliffforrest  United Kingdom
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I am aware of that.

I was objecting to it being quoted as an unqualified truth that reinforces the attitude that "all caps, especially elcos, are the devils work and should be replaced wholesale. Everywhere."
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Old 22nd September 2018, 06:41 PM   #20
cliffforrest is offline cliffforrest  United Kingdom
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Whoops! I didn't read all of the thread. Apologies.

I am having a "grumpy old man" day, partly because it is grey, raining and cold out.
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