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Old 11th April 2012, 11:34 AM   #191
AJT is offline AJT  Philippines
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Quote:
I tried to keep wire lay exactly over the previos layer's wire but the first turn shall be slip down the previous layer.
you do not need to apply too much pressure on the wire at the edge so that it does not fall off the edge, this is even easier with thin wires, as i said i use tapes to hold the edge......it takes practice and more practice....

for audio transformers, i use this 2mm wide masking tapes at the edges, i found this on a local hardware store recently and have used it since......

there is really no secret here, just plain hard work with your own hands....
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Old 11th April 2012, 11:57 AM   #192
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Quote:
Originally Posted by AndrewT View Post
Clamp a pair of temporary side panels to enable the windings to run right out to the edge.
Remember to allow a gap for insulation at the sides.

Instead of a clamp, it makes for easier winding if you, use a long bolt with a nut to hold the temporary sides in place.

this is actually a good advice........make the inter-layer insulation paper a bit wider so that is scrapes the side of the panels a bit....

this is what i do when not using nylon bobbins.....
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Old 12th April 2012, 09:29 AM   #193
hungdn is offline hungdn  Viet Nam
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Thank you Sir Tony,
I found a way to keep the wire not falling from the edge by applying 3mm margin tape on each layer.
Thank you very much
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Old 5th May 2012, 11:42 PM   #194
AJT is offline AJT  Philippines
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i am building traffos for a 6C33 set tube amp that is capable of about 10watts into 8ohm loads....

SET tube amps demand a lot of power for a measly power output, here i am making a traffo of about 390watts

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i use bobbin for 1.6 inch and 2 3/8 inch stack:

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filament winding terminations:
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built-up traffo:
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bamboo pegs at the 4 mounting holes, this lets the varnish go in between laminates.
here the traffo is hung out to dry for a day or so....
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Old 6th May 2012, 01:19 AM   #195
AJT is offline AJT  Philippines
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these are the output traffos, core is 1.5 x 2 inches, impedance ratio is 600:6 ohms....

building a pair side by side, one section by one section at a time until the whole buld is completed..

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dipping in varnish:
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hung out to dry after dipping in varnish....
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Old 7th May 2012, 05:05 PM   #196
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Hi Tony,

nice work, again!

What's the use of the three rolls on two axles that we see on this pic?
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And what has happened to the layer we see on the following one?
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Best regards!
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Old 7th May 2012, 10:02 PM   #197
AJT is offline AJT  Philippines
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Quote:
Originally Posted by Kay Pirinha View Post
Hi Tony,

nice work, again!

What's the use of the three rolls on two axles that we see on this pic?

And what has happened to the layer we see on the following one?

Best regards!
Hi Kay Pirinha,

those rollers helps in tensioning a bit and straightening out kinks in the wire, i use them like that for smaller gauge wires, for larger gauges it is just a straight pass thru...

the creppe tape at the edge is used to avoid subsequent layers from falling onto the previous layer.....
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Old 20th May 2012, 12:23 PM   #198
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hi tony,
i asked some questions before.
i found 2by2inch bobbin,but for 2inch bobbin the lamination is height (6inch height) for amp case it becomes to big.

can u tell me the lamination 4.5 inch height, what is the size of the bobbin?
i found 2 lamination materials, one is black, other one grey color.
lamination thick is near about 1mm.

for dual supply ,primary 235v-(30,60, 0 30,60ac secondary 10A) can u tell me what are the spec for this. primary winding turns, secondary turns and wire Gage, stack of laminations. for height 4.5 inch lamination.
pls reply asap.
thank u for Ur coperation

Last edited by wattaniya; 20th May 2012 at 12:34 PM.
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Old 20th May 2012, 10:48 PM   #199
AJT is offline AJT  Philippines
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Quote:
Originally Posted by nazirdigi View Post
hi tony,
i asked some questions before.
i found 2by2inch bobbin,but for 2inch bobbin the lamination is height (6inch height) for amp case it becomes to big.

can u tell me the lamination 4.5 inch height, what is the size of the bobbin?
i found 2 lamination materials, one is black, other one grey color.
lamination thick is near about 1mm.

for dual supply, primary 235v-(30,60, 0 30,60ac secondary 10A) can u tell me what are the spec for this. primary winding turns, secondary turns and wire Gage, stack of laminations. for height 4.5 inch lamination.
pls reply asap.
thank u for Ur coperation

you need a bobbin sized for 1 3/4 centre leg stacked to 4 1/2.....
you can get around 1740 volt amperes out of this...
primary turns = 233 turns #16 AWG magnet wire
secondary turns @30volts = 30 turns #13 AWG magnet wire, 4 coils, two bifillar windings....
in my country, the standard is AWG, please take note of this as you may have a different one in yours...
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Old 21st May 2012, 09:46 AM   #200
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hi tony thanks for the reply,
i cant find 1 3/4 center leg lamination, they have 3.8cm(1 1/2inch) center leg,so transformer height is 3.75inch. is this ok tony for my post no 198?

pls give the specs.
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