OK straight AC bad how about this? 8000kva

ben62670 · 30th January 2008, 05:58 AM

http://cgi.ebay.com/Amveco-120V-8KVA...QQcmdZViewItem

If this was wired for 120 in what would the output be?
44ac, and 60ac?
I am seriously looking for 2500va with 85dc output. Same as my Adcom GFA-585.

Thanks guys
Sorry about the other dumb thread it was a real question, and thanks for the staight answer.

Ben

poobah · 30th January 2008, 06:15 AM

The voltage will follow the ratios...

ben62670 · 30th January 2008, 06:36 AM

Thanks much. I was Pretty sure, but that would be a large purchase. Pun intended

phase_accurate · 30th January 2008, 06:40 AM

Maybe you should bid for this seller's forklift as well !!!!

Regards

Charles

ben62670 · 30th January 2008, 10:26 AM

I saw that. 130# for a 14" dia chunck o copper!

AndrewT · 30th January 2008, 11:24 AM

Hi,
the 0-208-240Vac input would suit the 220Vac you have at your distribution board.

If you feed in 120Vac you will get the half voltages (44 & 60) you are looking for AND you will get the same maximum secondary current i.e. 4000VA.

This would probably be more suited to provide balanced output for the whole music system.
The dual secondaries could be wired for balanced output, either 120Vac by 2 or 60Vac by 2 depending on whether the input is 110 or 220Vac.

wg_ski · 30th January 2008, 02:39 PM

Quote:

Originally posted by ben62670
http://cgi.ebay.com/Amveco-120V-8KVA...QQcmdZViewItem

If this was wired for 120 in what would the output be?
44ac, and 60ac?
I am seriously looking for 2500va with 85dc output. Same as my Adcom GFA-585.

Ben

Unfortunately, you need +/-85V to make an Adcom clone. You got no center tap so you either need *two* 130# trafos (and even I'm not that crazy) or you need to build each channel as a bridge amp off the single 85V rail. That's plenty doable. Use a voltage divider to make a pseudo-ground that's only used for the input signal reference. Then stack up as many channels off that supply as you want. Each will be about 200-250W /8R.

ben62670 · 4th February 2008, 03:46 AM

OK rectified DC voltage from a 60vac would be about 75vdc correct? I could share the two 75vdc outputs for many channels correct? How about the two 44vac outputs. Could they be combined to equal 88vdc? I have played with a few different power supplies with different results. Rectifying has given the same volts on some trans formers, and more on others. I don't see where there is no center tap on the outs. Please forgive my ignorance. Most of my experience is hands on, and Randy Slone amp book. I could also do a GFA-55 clone much easier than a GFA-585, and just increase the output transistors. I have about 200 Toshiba's in my possession.
Thanks
Ben
BTW any amp ideas with pcb's that could use the Toshiba's sd424, and 554's would be nice.
Thanks again
Ben

ßart West-VL. · 4th February 2008, 05:18 PM

60Vac would give you 83.65V, no load and drop voltage already calculated in it.

herm · 4th February 2008, 05:27 PM

Ben,

Have you looked at the Plitron Surplus website?

Check this out:

Surplus transformer

2400VA of +/- 60 WITH thermal resets in the leads and an aluminum can?

Can't be beat

herm

30th January 2008, 05:58 AM	#1
ben62670 diyAudio Member Join Date: Dec 2006	OK straight AC bad how about this? 8000kva http://cgi.ebay.com/Amveco-120V-8KVA...QQcmdZViewItem If this was wired for 120 in what would the output be? 44ac, and 60ac? I am seriously looking for 2500va with 85dc output. Same as my Adcom GFA-585. Thanks guys Sorry about the other dumb thread it was a real question, and thanks for the staight answer. Ben

30th January 2008, 11:24 AM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the 0-208-240Vac input would suit the 220Vac you have at your distribution board. If you feed in 120Vac you will get the half voltages (44 & 60) you are looking for AND you will get the same maximum secondary current i.e. 4000VA. This would probably be more suited to provide balanced output for the whole music system. The dual secondaries could be wired for balanced output, either 120Vac by 2 or 60Vac by 2 depending on whether the input is 110 or 220Vac. __________________ regards Andrew T.

4th February 2008, 05:18 PM	#9
ßart West-VL. diyAudio Member Join Date: Jun 2005 Location: West Vlaanderen	60Vac would give you 83.65V, no load and drop voltage already calculated in it. __________________ Bart

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30th January 2008, 06:15 AM	#2
poobah diyAudio Member Join Date: Nov 2005	The voltage will follow the ratios...

30th January 2008, 06:36 AM	#3
ben62670 diyAudio Member Join Date: Dec 2006	Thanks much. I was Pretty sure, but that would be a large purchase. Pun intended

30th January 2008, 06:40 AM	#4
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Maybe you should bid for this seller's forklift as well !!!! Regards Charles

30th January 2008, 10:26 AM	#5
ben62670 diyAudio Member Join Date: Dec 2006	I saw that. 130# for a 14" dia chunck o copper!

4th February 2008, 03:46 AM	#8
ben62670 diyAudio Member Join Date: Dec 2006	OK rectified DC voltage from a 60vac would be about 75vdc correct? I could share the two 75vdc outputs for many channels correct? How about the two 44vac outputs. Could they be combined to equal 88vdc? I have played with a few different power supplies with different results. Rectifying has given the same volts on some trans formers, and more on others. I don't see where there is no center tap on the outs. Please forgive my ignorance. Most of my experience is hands on, and Randy Slone amp book. I could also do a GFA-55 clone much easier than a GFA-585, and just increase the output transistors. I have about 200 Toshiba's in my possession. Thanks Ben BTW any amp ideas with pcb's that could use the Toshiba's sd424, and 554's would be nice. Thanks again Ben

4th February 2008, 05:27 PM	#10
herm diyAudio Member Join Date: Mar 2002 Location: Seville, Ohio USA	Ben, Have you looked at the Plitron Surplus website? Check this out: Surplus transformer 2400VA of +/- 60 WITH thermal resets in the leads and an aluminum can? Can't be beat herm

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