Tony's latest traffo DIY build

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360VA if you can squeeze in the same amount of copper and can liv with the distortion at maxed out induction.
I use 0.5T at 50Hz for lowest distortion (distortion increases at higher induction, starting from 0.4T, inductance reaches a max somewhere between 0.8 and 1.2T), this would give at most 80W output but it all depends on what you need or want want. In the old days 0.4-0.6T at 40Hz (allowing maxed out inductance at 20Hz) was considered best for minimum distortion with 3%Si Goss (McIntosh squeezed out a bit more, 75W with only 4kg of iron, but that is because the high amount of fb allowed for a bit higher transformer distortion)
 
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this is a power traffo using a 2inch center leg stacked to 3 1/4 inch DEECO silicon steel (noss) irons..
specs are as follows:
primary: 220 volts 60hz.
secondary1: 250volts at 2amps.
secondary2: 100volts at 0.5amps
secondary3: 12.6volts at 10 amps
secondary5&6: 6.3 volts at 3 amps

http://s5.photobucket.com/user/leoman53/media/tony trAFFOs/110711p- 036_zpsh8kt3qpt.jpg.html
http://s5.photobucket.com/user/leoman53/media/tony trAFFOs/110711p- 037_zpse0vzghcy.jpg.html
http://s5.photobucket.com/user/leoman53/media/tony trAFFOs/110629a-016_zpscljmyrko.jpg.html
http://s5.photobucket.com/user/leoman53/media/tony trAFFOs/110711p- 040_zpsgn2c8can.jpg.html

completed, there are 3 chokes sitting on top, 1/2inch, 5/8 inch, aqnd 3/4 inch.
http://s5.photobucket.com/user/leoman53/media/tony trAFFOs/110711p- 041_zpsso6g7jgm.jpg.html

testing prior to dipping in polyuretahne varnish


line voltage:


magnetizing current:


unloaded core apparent power:


actual unloaded power in watts:


power factor:

Dear Tony,
I have a tube preamp thet wants 120V and 12V power supply fom 230V AC EU mains power.
Would it be possible for you to make me a transformer with dual 120V and 12V outputs like the one here? Please quote in PM.

Greetings,
Mario G Rouwenhorst
Netherlands
 
Dear Tony,
I have a tube preamp thet wants 120V and 12V power supply fom 230V AC EU mains power.
Would it be possible for you to make me a transformer with dual 120V and 12V outputs like the one here? Please quote in PM.

Greetings,
Mario G Rouwenhorst
Netherlands

Mario, very sorry for the late reply, i design and build traffos for my own projects, but i am not a commercial entitity, sorry i do not sell transformers.....
 
found a core i was looking for a long time....
 

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latest traffo build for an amplifier build....1 3/4 inch center leg stacked to 4 inches, using 0.35mm H18 laminates
 

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Impressive, as ever :up:. I wish I'd have a winding machine and all the materials.

But I wonder why you're stacking the laminations this high instead of chosing bigger lams with a wider center leg to get a more square center cross section. The higher the quotient of height and width, the higher the turns length, which turns into higher DC resistances, and the higher the inter and intra winding capacitances.

Best regards!
 
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i made a power transformer for kt88/kt90/kt120/kt150/kt170. HT taps are selectable for up to 600vdc
bobbin welded to make a 114100 traffo..
 

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