oyster
100+ Head-Fier
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- Apr 26, 2009
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Quote:
Check the current rating as well, though likely it's at least 200 mA or so and thus okay.
It may be okay. If you have a multimeter to measure the voltage unloaded, then that should tell you. The voltage you measure without the adapter plugged into the amp (so unloaded) should be about 13.5V AC or so. In fact the "default" AC adapter recommended, the WAU12-200 (which I and many others use), is rated for 12V nominal but is more around 13.5V unloaded, so your 13V adapter may be okay. It depends also on what exactly the voltage is you're getting from the wall. Note that the transformer output voltage drops, the more power you pull from it.
If the rating is too low, then under sustained heavy power consumption, the voltage out of the transformer to the 12V regulators may drop close enough to 12V that the regulators get cranky and start to misbehave, meaning that the power supply rails have more noise on them, degrading the performance a little bit. Heavy power consumption pretty much means bench testing max output into low impedances--this probably won't happen in practice unless you're listening really load on a planar magnetic headphone while charging batteries (which are depleted) simultaneously. If not under sustained heavy power consumption, a suitable adapter on the "low" side is just as good, maybe even preferred since there will be less waste heat generated by the regulators.
Many thanks for the response. Although i could not understand most of it......am a big zero in electronics
The wall output is 240V. Just measured the unloaded output of the adapter, it's 13.05V. Should be ok then...right?
Also, would you still suggest getting a >14V supply for a better performance.....maybe more volume output?