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Old 4th March 2010, 12:17 PM   #1
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Default Motor run caps?

I ham looking at the SSE schematic and was wondering where folks use motor run caps? Are they necessary?
Which caps are the motor run caps?
I am a tube noob embarking on my first build ... exciting stuff!

Thx,
Rob
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Old 4th March 2010, 02:05 PM   #2
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80 uf 500 VAC Oil Filled Motor Run Capacitor Eyuda - eBay (item 310195976442 end time Feb-18-10 09:49:47 PST)

It goes in after the choke, its called "optional aux cap"

Motor run caps are the big metal ones that are normally oil filled. They handle alot more abuse and last alot longer under load then stock electrolytic. Other then ubber high voltage requirements im still not sure why everyone uses $15 motor run caps and not a 2nd $3 electrolytic cap.
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Old 4th March 2010, 02:11 PM   #3
AndrewT is offline AndrewT  Scotland
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motor start and motor run caps both come in either electrolytic or film type.

The electrolytic may not offer any benefit over normal high voltage electrolytics.

The film type are used because they allegedly improve the sound quality. They are bigger and more expensive.
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Old 4th March 2010, 02:35 PM   #4
urmoo is offline urmoo  Estonia
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Quote:
Originally Posted by nightanole View Post
80 uf 500 VAC Oil Filled Motor Run Capacitor Eyuda - eBay (item 310195976442 end time Feb-18-10 09:49:47 PST)
im still not sure why everyone uses $15 motor run caps and not a 2nd $3 electrolytic cap.
I am using 2 electrolytic caps (400WV 300uF) in row, signifficant improvement in sound... but have not tried motor run caps, so cant tell the difference...
Heh, 80 uf 500 VAC Oil Filled Motor Run Capacitor Eyuda 13$, transportation as follows:
US $19.64 Estonia USPS First Class Mail InternationalTM
And someone once was surprised how I managed to spend 900$ to my SSE
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Old 4th March 2010, 02:36 PM   #5
rknize is offline rknize  United States
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Film caps have really low ESR, which improves the dynamic response of the power supply. Surplus motor runs are a really cheap way to get a big film cap there, but the point is that it is a film cap and not another electrolytic.
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Old 4th March 2010, 03:09 PM   #6
urmoo is offline urmoo  Estonia
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Sorry albireo13 for posting my question here, just wanted to ask if anyone know a good online shop in Europe to buy MRC? Have spend some time, but have not succeeded to find any...
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Old 4th March 2010, 03:50 PM   #7
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How can you tell if its film or electrolytic?

oil filled = film

Last edited by nightanole; 4th March 2010 at 04:12 PM.
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Old 4th March 2010, 04:14 PM   #8
rknize is offline rknize  United States
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Sometimes it's hard to tell, but here are some clues: If it says oil, then you know it is film in oil (some are just film, which is OK too). If it has polarity markings, it is electrolytic.
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Old 4th March 2010, 04:28 PM   #9
Zen Mod is offline Zen Mod  Serbia
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search locally for Icar Italy motor run caps
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Old 5th March 2010, 02:13 AM   #10
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Rob,

I'll second the recommendation for the Eyuda motor run caps. The people on ebay who sell them are great to deal with. These are big suckers, so make sure your chassis has the space. You can see what they look like by going to my post (Gratuitous shots of my new SSE). I think the motor run cap and Triad choke helped a great deal in making my SSE totally hum-free.

Regards,
"The Cat"
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