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In Reply to: RE: Switchable power transformer or not? MUsic HAll conundrum posted by MEDiASAPiENS on August 30, 2015 at 03:23:12
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?Is there is do not exceed rule or would you perhaps cause excess output voltage?
Here At my house, my voltage in is about 117 or 118 MOST of the time, falling to in the 116 range during 'peak' demand times in summer. I would be inclined to go to the 120 tap, but what WOULD happen if I were to use the 110 tap?
It wouldn't surprise me if the input Color Code were on the UNDERSIDE of the removable transformer shell. or otherwise attached.
Too much is never enough
Edits: 08/31/15Follow Ups:
***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.
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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