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Old 7th May 2010, 05:09 AM   #1
ataul is offline ataul  Bangladesh
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Default output transformer turns per volt

Hi friends

my friend he want build a SE tube amp with 300B tube but output transformer is not available we deside to make an output transformer we have formula or idea for turns ratio for impedense but no idea that how many turns we shall wind in primery and which dia or which number of coper enamel wire we use our transformer size is 80VA chinice power transformer with good lamination black colour iron core. and if any friends have idea about it please share your experience with us.it is very kind if anyfriends reply.
sorry for bad english

Best regard

Ataul

Last edited by ataul; 7th May 2010 at 05:26 AM.
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Old 7th May 2010, 07:06 AM   #2
Arnulf is offline Arnulf  Europe
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1000 turns on the secondary side seems like a good starting point. You usually end up with 1000/1400 secondary and 3000+ primary.
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Old 7th May 2010, 07:26 AM   #3
Yvesm is offline Yvesm  France
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Hi Ataul,

I did that :
http://www.dissident-audio.com/SE_300B/KISS/DA143.pdf
Beware ! Metric numbers !

and obtained that:

Click the image to open in full size.

Yves.
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Old 7th May 2010, 08:12 AM   #4
ataul is offline ataul  Bangladesh
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thangs friends cannot understant about "mod"

ataul
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Old 7th May 2010, 08:58 AM   #5
ataul is offline ataul  Bangladesh
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Quote:
Originally Posted by Yvesm View Post
Hi Ataul,

I did that :
http://www.dissident-audio.com/SE_300B/KISS/DA143.pdf
Beware ! Metric numbers !

and obtained that:

Click the image to open in full size.

Yves.
hi Yvesm

great infformation Yvesm ,thanks

ataul
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Old 7th May 2010, 09:33 AM   #6
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Quote:
Originally Posted by ataul View Post
thangs friends cannot understant about "mod"
That's just a joke. Some people cannot stop changing parts in their amplifier even when it already sounds very good.
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Old 7th May 2010, 09:36 AM   #7
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hi,
when it comes to output trannies, we have a local manufacturer here in our country, I have used this product and I can attest to the sonic as well as ruggedness. They dont use ordinary irons, otherwise your project will sound mediocre and a fire hazard as well. Here it is, performing on my tube amp, a
6F6G single ended driven by 12AV6:
[IMG]Click the image to open in full size.[/IMG]
fresh from the shipment|:
[IMG]Click the image to open in full size.[/IMG]
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Old 7th May 2010, 09:44 AM   #8
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by the way that was 6AR5 before I finally replaced it with 6F6G, sorry 'bout that, here it is now.
[IMG]Click the image to open in full size.[/IMG]
they specialize in output as well as power trannies, I think their main office is at Switzerland, the plant is only located here in Phillipines.
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Old 7th May 2010, 10:38 AM   #9
ataul is offline ataul  Bangladesh
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Efren Noble

Nice output transformers photo, singapore is my nearest country so may i colect them from singapore.ok first i will try it to make because this is the
cheap solution, but when i will fail then i go to comertial tr

thanks

Ataul
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Old 7th May 2010, 10:49 AM   #10
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Ataul,

no problem, glad to be of help in my own little way to a fellow DIY'er,..
here's my amp driving a vintage Philips AD50600 in Onkyo D-032AX bokshelf enclosure.[IMG]Click the image to open in full size.[/IMG]

Best Regards,
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