Secondhand transformer replacement?

[ledmeter]

So I am thinking of using a leftover transformer from a sony CFS-85S in one of my Japanese boxes, as I'm giving one of them to my girlfriend and I don't like the idea of her plugging the thing into 240 mains without thinking. The two contenders are;
Sharp GF-508SB (23W)
Hitachi TRK-8600RM (18W)

And the Sony transformer is a 20W.

My question is, am I able to safely use the transformer in either one of these units? One will be underpowered by 3W and the other will be overpowered by 2W. I'm wondering if this is a serious issue or not and will it work?
Apologies for my lack of knowledge regarding this type of situation.
Any help would be super appreciated.

 

[Superduper]

The power rating is only what is available, not the amount of power that will necessarily be consumed. So it's probably best suited for the HItachi (are they both 8-cell boxes?). The GF-508 is a 10 cell box and the voltage needs are probably a bit higher than the CFS-85 transformer can produce. Additionally, the 23w draw might be more than the Sony transformer is capable of generating for extended periods safely without overheating, although in truth, I do believe that as long as used moderately at reasonable listening levels, the Sony transformer should work fine in either application.

You need to understand that the watt (VA) rating is a product of 2-values..... volts x amps. Volts is the value that you do not want to exceed, as volts is what "pushes" the amps through a load. The higher the voltage, the more "push" the power supply has. If your boombox wants 12 volts and you give it 15.... then things could blow or stress. In reality, the circuits are more forgiving than that. A 12 volt unregulated power supply might actually could produce 15 or 16 volts. However, an unregulated power supply intended for 15 volt circuits will exceed that by at least another 3+ volts or so. The amp (current) rating is a diferent story. The amount of amps consumed is dependant upon the devices needs and the available voltage. As long as voltage is within normal range, then current draw should not be exceeded.

Bottom line.
(1) Make sure voltage of the new transformer is proper for the device you are installing it into. DO NOT use higher voltage transformer than the devices needs.
(2) Try to make sure the amp rating (or available total power, i.e. watts or VA) is sufficient for the application. Higher is OK. Lower could introduce problems.

 

[ledmeter]

Thankyou very much! That has helped me a lot.
In addition to being Superduper, you are also lovely.
Thanks again!

 

[monchito]

Thankyou very much! That has helped me a lot.
In addition to being Superduper, you are also lovely.
Thanks again!

he is my brother from another mother.