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In Reply to: RE: Switchable power transformer or not? MUsic HAll conundrum posted by pictureguy on August 31, 2015 at 11:59:18
***MY question would be that IF you are in a 230v country and it really IS hovering at 230+-2 or 3 vac, than which tap WOULD you use? 220 or 240?***
One can not answer this question intelligently without knowing the design details of that product. Some units may indeed have components overstressed when using 220V setting, but they might produce a bit more power. It is generally safer to configure it for 240V.
Remember also, that 220, 230 or 240V operation usually also means 50Hz, which is MUCH harder on the transformer.
Follow Ups:
What I understand about transformers is that a 50hz unit will work fine @60hz while a 60 may or may not work properly @50. I think I remember correctly.
Please correct me if I'm wrong.
I would also suspect that as downstream power supplies MAY be regulated, the slight over voltage won't make any difference. In a SS amp, for example, if the PS kicks out 50vdc, you may use some over rated filter cap. Certainly, IMO, no LESS than 60v
On the original picture of the transformer, I see 6.8v which implies HEATER, right? I doubt that is regulated so I don't know how much over it can stand?
Too much is never enough
You are correct on the transformer - basically, the 50Hz model must have more iron in its core.
The rest is just a conjecture, we do not know the internal details.
In case of that 6.8V several things could be happening. For instance, it could be fed to the filaments through resistors, dropping a fraction of a volt - good practice, softening the inrush current. Or it could be rectified and then regulated, maybe down to 5V.
I don't like making wild guesses, I presume the designers knew what they were doing... unless shown otherwise. :)
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