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looking for sensible quality caps
looking for sensible quality caps
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Old 18th August 2019, 11:04 PM   #1
soundoutlad is offline soundoutlad  Ireland
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looking for sensible quality caps
Default looking for sensible quality caps

Hi, I'm looking for advice on choosing good quality components for my first amp build. I want to avoid exotic and expensive (especially capacitors) but also want to avoid the cheapest components intended for disposable electronics. Any advice on buying good quality components would be appreciated.
I include a link to the build: The 6CY7 Amp | Cascade Tubes
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Old 18th August 2019, 11:16 PM   #2
indianajo is online now indianajo  United States
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Farnell doesn't sell any garbage. Check their stock. For the .01 uf I would use vishay sprague orange drop, the polyprophylene ones, but they are quite pricey. Make sure the voltage rating exceeds the application. Put voltage and value in their selector tool, check stock only and no special order, they will show you what they are keeping. I believe they will force you to call the .01 uf a 10 nf, just because a rating has worked for 70 years doesn't mean we shouldn't change today.
The multi uf caps will have to be electrolytic, which are inevitably short life. Buy the longest service life rating you can find in stock, sometimes 3000 hr, sometimes 10000 hr. I've been happy with panasonic, nichicon, rubycon. Less strenuous end of life rating caps are united chemicon, CDE, multicomp. All those brands have performed okay for me in my organs & amps. Prior to the internet & debit card, I had to buy the TV store stock caps, probably 1000 hour service life rated or shorter. I've had to replace those electrolytics 4 times in my tube amp I bought in 1970. the 50 uf cathode bypass cap should be rated 25 or 50 v to maintain the capacitance value at the low voltage on it.
The starred sale caps are passed their shelf life. Charge them up with the ohms scale of a dvm to reform before using them.
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Last edited by indianajo; 18th August 2019 at 11:42 PM.
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Old 19th August 2019, 11:55 PM   #3
soundoutlad is offline soundoutlad  Ireland
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looking for sensible quality caps
Thanks Indianajo,
they all carry such a range of stock with numerous options of same value components I was struggling with the choice, a bit of guidance is great.
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Old 21st August 2019, 10:07 PM   #4
Mark Tillotson is offline Mark Tillotson
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PPS is another good dielectric if PP isn't available/cheap.


For electrolytics go for high temperature ratings 2000 hour/105C cap will last a very long time at 60C, whereas a 5000 hour 85C one may not.
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Old 22nd August 2019, 12:45 PM   #5
oncle_tom is offline oncle_tom  Germany
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Where to find cheap PPS Caps in Values > 1F
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Old 22nd August 2019, 12:59 PM   #6
amplidude is offline amplidude  Denmark
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Quote:
Originally Posted by soundoutlad View Post
Hi, I'm looking for advice on choosing good quality components for my first amp build. I want to avoid exotic and expensive (especially capacitors) but also want to avoid the cheapest components intended for disposable electronics. Any advice on buying good quality components would be appreciated.
I include a link to the build: The 6CY7 Amp | Cascade Tubes
An easy way to tell if components are quality, is a standard magnet, avoid components with steel legs, they are often low quality.
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Old 22nd August 2019, 01:02 PM   #7
amplidude is offline amplidude  Denmark
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Originally Posted by oncle_tom View Post
Where to find cheap PPS Caps in Values > 1F
I often place bids on eBay auctions, some components dealers, often clear their shelves and sell mixed lots of capacitors, I've made many good deals this way.
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Old 22nd August 2019, 01:09 PM   #8
twocents is offline twocents  South Africa
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looking for sensible quality caps
Quote:
Originally Posted by amplidude View Post
An easy way to tell if components are quality, is a standard magnet, avoid components with steel legs, they are often low quality.
Interesting, but a bit difficult to do on the Mouser website.
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Old 22nd August 2019, 01:14 PM   #9
amplidude is offline amplidude  Denmark
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Interesting, but a bit difficult to do on the Mouser website.
Just buy a giant neodymium..
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Old 22nd August 2019, 04:54 PM   #10
Demonkleaner is offline Demonkleaner  United States
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The component data sheet link on Mouser should tell you?
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