MG15DFX Conversion

pbass48 · 16th November 2011, 05:34 PM

Hi. I wonder if it's possible (or practica) to convert a European (230v 50Hz) Marshall MG15DFX to USA 115v 60Hz. Could it be as simple as replacing the input transformer and supply cable plug?

pbass48 · 30th November 2011, 08:35 PM

Not even one response?

Cal Weldon · 30th November 2011, 08:47 PM

Sometimes its good to bump the thread as you have. Gets it back in the light. Hopefully you'll get an answer this time.

jeronimo2003 · 30th November 2011, 09:47 PM

If you mean input transformer as the transformer that converts the mains to the needed voltages for your amp then the answer is simply yes.
But I am not familiar with this amplifier, it might even be possible that it has a built in voltage selector. Or even a mains transformer with primary windings that can be reconnected for operation on 115VAC.

RJM1 · 1st December 2011, 05:05 AM

Link to schematic:

http://www.amparchives.com/Amp%20Arc...%20MG15DFX.pdf

It looks like the power transformer is a 30V center tap 30 to 50VA.
If you replace the power transformer and the power cord you should be good to go.
Since the schematic does not show a power fuse I would add a .75 to 1A fuse on the AC input lead.

RJM1 · 1st December 2011, 05:52 AM

Or up to 34 VCT which will give you about 23.4 V after the rectifiers.

pbass48 · 1st December 2011, 08:15 PM

I very much appreciate the help. I also had contacted Marshall who replied that it would be too expensive and I should just buy another amp. Then I searched "voltage converters" and found this website (link below) that might be the cheap easy solution to this problem. Thanks again!
Seven Star 100W STEP UP STEP DOWN VOLTAGE CONVERTER POWER TRANSFORMER

16th November 2011, 05:34 PM	#1
pbass48 diyAudio Member Join Date: Nov 2011	MG15DFX Conversion Hi. I wonder if it's possible (or practica) to convert a European (230v 50Hz) Marshall MG15DFX to USA 115v 60Hz. Could it be as simple as replacing the input transformer and supply cable plug?

30th November 2011, 08:47 PM	#3
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Sometimes its good to bump the thread as you have. Gets it back in the light. Hopefully you'll get an answer this time. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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30th November 2011, 08:35 PM	#2
pbass48 diyAudio Member Join Date: Nov 2011	Not even one response?

30th November 2011, 09:47 PM	#4
jeronimo2003 diyAudio Member Join Date: May 2010	If you mean input transformer as the transformer that converts the mains to the needed voltages for your amp then the answer is simply yes. But I am not familiar with this amplifier, it might even be possible that it has a built in voltage selector. Or even a mains transformer with primary windings that can be reconnected for operation on 115VAC.

1st December 2011, 05:05 AM	#5
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	Link to schematic: http://www.amparchives.com/Amp%20Arc...%20MG15DFX.pdf It looks like the power transformer is a 30V center tap 30 to 50VA. If you replace the power transformer and the power cord you should be good to go. Since the schematic does not show a power fuse I would add a .75 to 1A fuse on the AC input lead.

1st December 2011, 05:52 AM	#6
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	Or up to 34 VCT which will give you about 23.4 V after the rectifiers.

1st December 2011, 08:15 PM	#7
pbass48 diyAudio Member Join Date: Nov 2011	I very much appreciate the help. I also had contacted Marshall who replied that it would be too expensive and I should just buy another amp. Then I searched "voltage converters" and found this website (link below) that might be the cheap easy solution to this problem. Thanks again! Seven Star 100W STEP UP STEP DOWN VOLTAGE CONVERTER POWER TRANSFORMER

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