I need a DC 6volt 200mA adapter.?

200mA is the current rating of the adapter. That means it can safely supply up to 200mA of current at 6 volts DC. Thus it can be inferred that the device being powered by that adapter does not need more than 200mA to operate. If you cannot find a replacement that is rated for 200mA then you need to find one that has a higher rating, not one that is lower. Therefore a 300mA would be ok as would a 500mA one. You could even use one that was 1A or 2A if you couldn't find anything close but that would be overkill. And to be very clear, just because an adapter is rated at 500mA does not mean it is going to force your device to take 500mA. Your device will draw the appropriate amount of current necessary to operate. It just means the adapter has the ability to deliver 500mA of current if necessary.

While a larger capacity adapter is ok to use, there is a slight danger to using one. Unless the unit in question is fused, if it fails and shorts out, the lower capacity adapter will limit the amount of current that will be fed to the unit where a larger capacity adapter would allow a larger current and thus do more damage. It isn't something that happens very often (hasn't happened to me) but since it is a possibility I though it should be mentioned.

6 Volt Power Adapter

200mA means that it produces 200 milliAmperes (milli simply means 1/1000th) or 1/5 of an Amp - the amount of current available from the adapter. You can substitute any adapter with a higher power rating - so 6V with 300mA is just fine. Don't change the voltage but make sure you have 200mA or more.

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RE:

I need a DC 6volt 200mA adapter.?

I can find 6 volt adapters all day long but I cannot find one that is "200mA". How important is that? What does "200mA" mean? Can I replace it with something equivalent? Any information would be very helpful. Thank you

Likely a cordless phone extension base, or a charger for some thing that uses a 2-5 cell NiCad or NimMH pack.

Milli Amperes is the energy and volts is the force pushing it. You want to stay with the rated V and mA. If you go higher you will overheat and may burn it out. 300mA may work but check the temperature if you use it.