230V transformer for a 832 PP project

trondareo · 22nd November 2009, 11:23 AM

I am collecting parts for building a 832 PP amp based on this audio diy

But I have trouble finding a 230V primary to 200VAC secondary power transformer. Heaters are 6,3V but I can find a second transformer for this if necessary.

Lundahl and Plitron supply 220V units but they are on the expensive side and require some reduction resistor or other solution. I have found a Edcor 8000K output transformer, and wonder if I should call them to hear if they have something not listed or custom for a reasonable price.

I have been through just about everything, but hope some of you guys can help.

Arnulf · 22nd November 2009, 11:52 AM

Do you have access to transformers with higher ratio (say 230V : 275V) ? You could use one and simply turn it around.

trondareo · 22nd November 2009, 01:30 PM

I found this Edcor trannie that seems to fit the bill: XPWR088
It´s primary 240 V but our typical current is 233 to 235 V so it might be OK

I´m really a newbe at this so any input is welcome.

kuroguy · 22nd November 2009, 03:02 PM

If you want a torroidal transformer, look at the 220 volt secondary ones at Hammond Mfg. - Toroid Power Transformer - (182 Series) .

By the way, I have one of those amps (see my avatar and search for some photos in the post pictures thread) and really like it.

trondareo · 22nd November 2009, 06:45 PM

Ah yes, I´ve seen your project kuroguy; inspiring!

There is not much current over the B+ so it might be OK to reduce 220v with just a resistor of two watt. That would open up my options a bit.

But right now I am thinking of using the XPWR088. Because I like the classic style. It has secondaries of 340V at 400mA, 200V at 200mA, 12.6V (6.3-0-6.3) at 5A and 10V at 5A. I´m thinking of using the 200v for two B+ es. With all four tubes I hope to draw about 0.100mA. And then the 2 x 6,3 for heaters have plenty of power. The others will not be used.

torrence · 22nd November 2009, 08:28 PM

I bought a 460 VCT toroidal transformer from Antek for my own 832 project. It has dual primary windings, so should work fine with 220VAC. It also has dual heater coils, so you can choose 6.3 or 12.6. They sell these cheaper on eBay than through their own store.

22nd November 2009, 11:23 AM	#1
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	230V transformer for a 832 PP project I am collecting parts for building a 832 PP amp based on this audio diy But I have trouble finding a 230V primary to 200VAC secondary power transformer. Heaters are 6,3V but I can find a second transformer for this if necessary. Lundahl and Plitron supply 220V units but they are on the expensive side and require some reduction resistor or other solution. I have found a Edcor 8000K output transformer, and wonder if I should call them to hear if they have something not listed or custom for a reasonable price. I have been through just about everything, but hope some of you guys can help. __________________ I´m doing stuff at http://taooftubes.blogspot.com/

22nd November 2009, 01:30 PM	#3
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	I found this Edcor trannie that seems to fit the bill: XPWR088 It´s primary 240 V but our typical current is 233 to 235 V so it might be OK I´m really a newbe at this so any input is welcome. __________________ I´m doing stuff at http://taooftubes.blogspot.com/

22nd November 2009, 03:02 PM	#4
kuroguy diyAudio Member Join Date: Sep 2007	If you want a torroidal transformer, look at the 220 volt secondary ones at Hammond Mfg. - Toroid Power Transformer - (182 Series) . By the way, I have one of those amps (see my avatar and search for some photos in the post pictures thread) and really like it. __________________ "The magnet wire used to come from Radio Shack. In keeping with their policy of figuring out what the best products are and discontinuing them they no longer have it." - Max Robinson

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22nd November 2009, 11:52 AM	#2
Arnulf diyAudio Member Join Date: Feb 2009	Do you have access to transformers with higher ratio (say 230V : 275V) ? You could use one and simply turn it around.

22nd November 2009, 06:45 PM	#5
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	Ah yes, I´ve seen your project kuroguy; inspiring! There is not much current over the B+ so it might be OK to reduce 220v with just a resistor of two watt. That would open up my options a bit. But right now I am thinking of using the XPWR088. Because I like the classic style. It has secondaries of 340V at 400mA, 200V at 200mA, 12.6V (6.3-0-6.3) at 5A and 10V at 5A. I´m thinking of using the 200v for two B+ es. With all four tubes I hope to draw about 0.100mA. And then the 2 x 6,3 for heaters have plenty of power. The others will not be used.

22nd November 2009, 08:28 PM	#6
torrence diyAudio Member Join Date: Feb 2008 Location: Oregon	I bought a 460 VCT toroidal transformer from Antek for my own 832 project. It has dual primary windings, so should work fine with 220VAC. It also has dual heater coils, so you can choose 6.3 or 12.6. They sell these cheaper on eBay than through their own store.

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