The electric outlet in the United States are 110 volt and bring their domestic product to my country which is 220 volt is require the step down transformer, which somehow more complicated and dangerous if you accidentally plug in directly to the wall outlet.
Luckily most of the product are compatible with 220 volt, but need some modification for this voltage conversion. And this is how I do it on the Counterpoint SA-2000 pre-amplifier.
Looking at the back of this Counterpoint SA-2000 is clearly see the power input require is 117 VAC 50/60Hz. There is no voltage selector on it.
The internal layout of this pre-amplifier are using all audio grade components. Very nice to look at.
It has the schematic on the transformer wiring.
Disclaimer: Any statement and photos in this article are not allowed to copy or publish without written permission from the writer. Any injury or loss from following tips in this article is not under writer responsibility.
Looking at the back of this Counterpoint SA-2000 is clearly see the power input require is 117 VAC 50/60Hz. There is no voltage selector on it.
The internal layout of this pre-amplifier are using all audio grade components. Very nice to look at.
You will notice the vacuum tube are 6DJ8 and 6CA4. The capacitor are Wonder cap and Wima. The potensiometer is from high quality Noble brand.
Now let's see to the primary section of the power transformer.
Now let's see to the primary section of the power transformer.
It has the schematic on the transformer wiring.
You can spot the double primary winding of 110 volt and when you make them in series, they will accept to 220 volt of voltage input.
There is also mark Hi & Lo on the board. The default for 110 volt is Lo, then I testing to the Hi point and it actually make the primary winding in series just like my intention to make it works to 220 volt.
I connect to the ohm meter, each winding will show 32 ohm.
Now remove the cable in Lo point and move to the Hi point like this.
You will read 62 ohm on ohm meter after doing this new wiring layout.
There is also mark Hi & Lo on the board. The default for 110 volt is Lo, then I testing to the Hi point and it actually make the primary winding in series just like my intention to make it works to 220 volt.
I connect to the ohm meter, each winding will show 32 ohm.
Now remove the cable in Lo point and move to the Hi point like this.
You will read 62 ohm on ohm meter after doing this new wiring layout.
Then I remove the fuse and replace with 100 watt bulb lamp across the fuse for safety test reason. The bulb should not lit if all the connection are correct. Then you can remove the bulb and put the fuse in place.
It is an easy job and now this Counterpoint pre-amplifier can accept 220 volt AC input directly without any parts changing.
It is an easy job and now this Counterpoint pre-amplifier can accept 220 volt AC input directly without any parts changing.
Disclaimer: Any statement and photos in this article are not allowed to copy or publish without written permission from the writer. Any injury or loss from following tips in this article is not under writer responsibility.
Wow, great. I have been looking for this kind of voltage conversion tutorial for ages.
ReplyDeleteDo you have to change the fuse rating too to accommodate the higher voltage?
Hi, thanks for your visit to this blog. Anyway, I am not changing the fuse at all, it is only rewiring the primary transformer.
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