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Old 20th August 2011, 01:46 AM   #31
Zaaphod is offline Zaaphod  United States
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Wow very impressive transformers! Thanks for the great photos. I find this idea of making your own transformers very intriguing. That winding device looks very interesting.. I see there is a counter to keep track of the number of turns. I would really love to see a video of the winding process in action!

I would also like to learn how to construct my own transformers as well. I am wondering if it's practical to wind a transformer with 4 secondary windings, say two 12v @ 100mA for an op-amp preamp with split power supply and two 30v @ 2.5A for a power amp with split supply. This just for example, I haven't worked out the exact voltage and current requirements yet... but I'm wondering if it's a good idea or not to use one transformer to run both sets of power supplies. I am thinking I would regulate at least the preamp supplies.
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Old 8th September 2011, 08:55 AM   #32
Junm is offline Junm  Philippines
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Default output trafo winding turns?

Hi sir Tony and brilliant trafo guys here....need your help please...

I'm really obsessed in building one small tube PP amp using russian 6P3S-E (6L6 equiv) but my biggest problem is the output trafo. I have 2 1x1 sq inch trafo to wind but i hardly can't calculate how much turns in the primary and on the 8/16 ohm output. I don't know how much wattage it can handle on 8 ohms using 320v Plate voltage (main trafo specs is 240v/200VA). Can you help me out. I'm confused on reading some references on the net.

I am new to winding output trafo, if you can give some simplified calculations maybe i can give a try and I will appreciate it very much..
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Old 8th September 2011, 11:35 PM   #33
AJT is offline AJT  Philippines
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^hi, the 6L6 tube likes 6.6k anode to anode loads....at that B+ of 320 volts, 15 to 20 watts in class ab1 is possible....
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Old 9th September 2011, 01:06 AM   #34
Junm is offline Junm  Philippines
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Quote:
Originally Posted by Tony View Post
^hi, the 6L6 tube likes 6.6k anode to anode loads....at that B+ of 320 volts, 15 to 20 watts in class ab1 is possible....
Thanks sir fo the info....the 6.6k is the total impedance or center tap output (3.3k +3.3k) is that right sir? At what core area must be the proper output trafo and i need to know how many turns the primary and secondary ...if you mine sir? thanks
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Old 9th September 2011, 03:45 AM   #35
AJT is offline AJT  Philippines
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pm me with your core details....
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Old 10th September 2011, 11:26 AM   #36
AJT is offline AJT  Philippines
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a pair of 15k:300ohm audio isolators:

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Old 21st September 2011, 09:35 AM   #37
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sir tony,
can pls help me out?
i want to wind my own traffo for H900
80-40-0-40-80 20 amper.
can u pls tell me about EI core size,bobin size, and also a copper wire guege,turns of primery,n also the sec. tapping.
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Old 22nd September 2011, 08:04 AM   #38
AJT is offline AJT  Philippines
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Quote:
Originally Posted by sandeep kayarkar View Post
sir tony,
can pls help me out?
i want to wind my own traffo for H900
80-40-0-40-80 20 amper.
can u pls tell me about EI core size,bobin size, and also a copper wire guege,turns of primery,n also the sec. tapping.
sure, what EI core are you using and what it the grade? note also that in your country you use the British standards wrt wire sizes...what power are you expecting to achieve?
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Old 23rd September 2011, 05:54 AM   #39
AJT is offline AJT  Philippines
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Hi all,

these are 2 OPT's for a tube amp i am building, it has a 1.75in center leg stacked to 3.125inches, using Edrel's Z11(M6) cores.....
finally put to use, to give you an idea, the core is about 15kg at P500 per kilogram and copper at about 2.5kgs at about P700 per kilo......
bobbins used also supplied by Edrel and is nylon type.....
the use of wooden mandrels allowed me to wind the coils in sections, winding one coil after the other to avoid errors and ensure identical traffo build...

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materials used includes:
Kapton tape, polypropylene plastic inter-layer insulation, 1/8 inch masking tapes to provide additional creapage distance:
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one of 4 primary coils and 1 of 4 secondary coils done:
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winding the rest of the coils
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stacking the E and I's to complete the build up:
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Old 24th September 2011, 02:26 PM   #40
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Very, very nice!
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