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I have a 200uf solen cap filtering the driver stage of my amp. What would be a good value and type of capacitor for a bypass?
Follow Ups:
The type of driver circuit might be relevant to the answer. For example, a well-balanced differential phase inverter should have low transient current demand, making the power supply less critical; a single-ended driver would be more sensitive to the supply caps.
David
Bypassing a film cap in a power supply is silly..You already have a superb low esr cap that is much faster and lower esr than any electrolytic.What would you gain by bypassing? Nothing!!
In the signal path,that would be a different story but not in the power supply.
If the power supply waveform isn't pretty,neither is the sound in most cases.
The power supply is in the signal circuit. An oil-filled motor run type tends to fill out the bright/edgy tendency of the Solen.
"My God, it's full of stars"
Are the ASC brand motor/run caps you can get at industrial supply houses a good place to start for these?
D
Dmannnn,
Probably a good bet. I don't know how different brands of motor run caps may vary in sound. I've been using used HID lighting caps. Same thing as motor runs, but free to me!
You could check with a local electrical contractor that works on HID lighting (that is high intensity discharge, a range which encompasses metal halide, mercury vapor, low and high pressure sodium.
Folks that service these are forever replacing complete ballasts. The caps usually last a very long time. Venture Lighting, HID Direct, and others will sell the caps only, probably much cheaper than the electrical supply house or an electronics mail order catalog.
You could also check on line surplus houses, both for electronics and electrical supplies.
Best of luck,
Stuart
"My God, it's full of stars"
hey-Hey!!!,
I have also found metalized Solen caps bright/edgy/fizzy. The action I've taken to mitigate that behaviour is to avoid them. It is as simple as that...:) Doesn't quite solve your problem w/o a trip out capacitor shopping, but I think it is reasonable.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Doug
I have found that also when they are used for coupling..When used in power supplies with good breakin time,they fared pretty well I thought.
If the power supply waveform isn't pretty,neither is the sound in most cases.
Not in the sense where bypass will make a difference..Sure the DC sources feed the tubes where signal is present but I dont see where a bypass will benefit a low esr cap...Now in the case of direct signal,as in the output stage of a preamp when your dealing with all frequencies,bypassing is a must when you have a cap thats 2uf or higher..The larger caps don't pass high frequencies very well as compared to the small caps.
Getting back to the PS,your dealing mostly with 60 or 120hz.I have tried bypassing and gained nothing nothing on measure of power,distortion,or freq response when I was using polypro filter caps..Now with electrolytics bypassed with a 20uf poly,I heard and measured nice differences.
If the power supply waveform isn't pretty,neither is the sound in most cases.
Michael
The last PS cap is in the signal path on a SE design.
It does have to deal with the whole frquency band.
DanL
In this case yes.That you would maybe try bypassing.
If the power supply waveform isn't pretty,neither is the sound in most cases.
The decoupling cap is in the signal path.
The rest of the power supply should not be if the decoupling cap is doing it's job.
The thing is, I think Iczerman is talking about his decoupling cap.
Whatever sonic deficiencies that cap has will be heard.
Tre'
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