Active filters.
If by triode, you mean "a three-electrode tube", then yes. You need a source of current into the device, a control electrode, and an "outlet" for the controlled current. Although there were radically different types of construction, all early amplifying tubes were triodes of some kind.
Coffee filters Air Filters in cars Water filters
Enlarge, strengthen, magnify, augment, intensify, cultivate, etc.
A simple machine is a type of machine that changes forces in some way, by amplifying them, and/or changing their direction. The lever, the pulley, the wheel and axle are all simple machines. But there are complex machines as well, which do far more things. Our computers are also machines.
An amplification is an act of amplifying, expanding or making larger, or the act of increasing some quantity such as voltage, power or current.
Tap water contains chlorine, chemicals and various kinds of bacteria. You can eliminate some of the dangers inherent in tap water by using one of the various types of GE filters. General Electric (GE) manufactures refrigerator water filters, water pitcher filters and other types of water filters. GE filters can provide good solutions to drinking and cooking with pure, filtered water without having to pay for bottled water. GE filters end up costing a lot less money per year than the expense involved in buying bottled water every week. Filters are simple to use and enable you to drink healthier water.
They are permanent filters that are only replaced when the fuel pump is replaced.
There are a number of places to look up information about oil filters. Some websites which offer information are Fram Catalog and Wix Filters. Napa Filters and Oil Filters Online are two other sites which offer information regarding oil filters.
Put a filter system on it! Some types have inline filters for them, not the huge filters.
This would be a personal choice. Since there are ALL different kinds of Hepa Filters out there I recommend that you speak with a qualified person to give you some insight on what might work best for your home
Look on internet - Some companies, notably Purolator cross ref filters.
many filters are available. some are bilateral,trilateral, anisotropic,median etc