Help for SE Main Transformer

baikostov · 23rd September 2006, 08:59 PM

Could any one please tell me what kind of transofrmer laminations, wire, bobbins and isolation is required to build a main transformer for SE valve amplifier?And where to order?
Thanks in advance

ErikdeBest · 23rd September 2006, 10:21 PM

Hi Baikostov. A power supply, even for a tube amp, is still a power supply and you really don't have to make weird things. What kind of amplifier are you thinking to build? If it uses a EL84 or EL86 I would go with an isolation trafo, 230 to 230VAC, which rectified (with SS) and some decoupling will give some nice B+.

Erik

baikostov · 24th September 2006, 08:26 AM

Hi Erik.The project type is Loftin-White and the schematic is:http://www.geocities.com/dreamsdestroyer/6C4C_cap.gif

ErikdeBest · 24th September 2006, 08:39 AM

Hi Baikostov

I think the best place to ask this is at the thread where this schematic comes from. There are already some very experienced people around there, you make a bigger chance in getting answers to your questions.
6A3/6B4G/6S4S(2A3/2S4S) project

As for the parts, I would go with a assembled trafo. I have read that it is difficult to source steel...and from what I understand you have no expericence in winding trafo's (neither do I have). Also SE OPT is a pain in the *** to make right. So you would have to buy...you can buy them everywhere, but iron is expensive to transport. So you may try to locate some spanish people in this forum and ask where they bought their iron...(I know of one who built a 300B SE, but used Lundahl throughout, and that is something expensive.)

Good luck

Erik

Edit: how much are you willing to spend on the whole amp?

AndreasS · 24th September 2006, 09:01 AM

Quote:

Originally posted by baikostov
... type is Loftin-White and the schematic is:http://www.geocities.com/dreamsdestroyer/6C4C_cap.gif

This is not a Loftin-White schematic, but a RC-coupled single ended. For Loftin-White look please:

http://www.mindspring.com/~mjh850830/loftin-white/

Andreas

23rd September 2006, 08:59 PM	#1
baikostov diyAudio Member Join Date: Jul 2006	Help for SE Main Transformer Could any one please tell me what kind of transofrmer laminations, wire, bobbins and isolation is required to build a main transformer for SE valve amplifier?And where to order? Thanks in advance

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23rd September 2006, 10:21 PM	#2
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Netherlands	Hi Baikostov. A power supply, even for a tube amp, is still a power supply and you really don't have to make weird things. What kind of amplifier are you thinking to build? If it uses a EL84 or EL86 I would go with an isolation trafo, 230 to 230VAC, which rectified (with SS) and some decoupling will give some nice B+. Erik

24th September 2006, 08:26 AM	#3
baikostov diyAudio Member Join Date: Jul 2006	Hi Erik.The project type is Loftin-White and the schematic is:http://www.geocities.com/dreamsdestroyer/6C4C_cap.gif

24th September 2006, 08:39 AM	#4
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Netherlands	Hi Baikostov I think the best place to ask this is at the thread where this schematic comes from. There are already some very experienced people around there, you make a bigger chance in getting answers to your questions. 6A3/6B4G/6S4S(2A3/2S4S) project As for the parts, I would go with a assembled trafo. I have read that it is difficult to source steel...and from what I understand you have no expericence in winding trafo's (neither do I have). Also SE OPT is a pain in the *** to make right. So you would have to buy...you can buy them everywhere, but iron is expensive to transport. So you may try to locate some spanish people in this forum and ask where they bought their iron...(I know of one who built a 300B SE, but used Lundahl throughout, and that is something expensive.) Good luck Erik Edit: how much are you willing to spend on the whole amp?

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