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Tony's latest traffo DIY build
Tony's latest traffo DIY build
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Old 31st January 2018, 02:53 AM   #1001
TonyTecson is offline TonyTecson  Philippines
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Join Date: May 2003
Location: Palatiw, Pasig City
Tony's latest traffo DIY build
a pair of OPT's and power traffo for an ucpoming 2A3 set build...
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Old 22nd February 2018, 11:48 PM   #1002
engel dela pena is offline engel dela pena  Philippines
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im planning to build 330-0-330 with 6.3 ct using 2x el84 and 2x12ax7 and uf4007 bridge config,i found this site sir tony............Calculate Tube Amp Power Transformer Current
i tried and get this result
Selected transformer voltage: 325-0-325

Calculated voltage at first capacitor (B+): 445.25V. Subtract 6V, if using choke.

Calculated filament current (typically the 6.3v secondary): 2.18A

Calculated current: 62.56mA at 16521R calculated load (10% plus factored in). Preamp valves current draw is estimated at typical 12AX7 max dissipation of 1.2W at 330V, i.e. 3.6mA per triode


what available core can i use?deeco ordinary cores
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Old 23rd February 2018, 02:56 AM   #1003
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
deeco cores are okey, surplus cores can be better, you can also get them from Edrel Sison, he is on facebook...h18 or rm 18 or z11...
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Old 23rd February 2018, 03:12 AM   #1004
engel dela pena is offline engel dela pena  Philippines
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thanks kuya tony
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Old 26th April 2018, 12:07 PM   #1005
sanbadgujar is offline sanbadgujar  India
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Join Date: Aug 2012
Location: INDIA, Maharashatra
Default New Build

Hello Tony sir

I am going to build New toroidal transformer core dimension are as follows.
OD- 140mm
ID - 90mm
Ht - 50mm
Window area mm2 - 6358
Effective cross-sectional area mm2 - 1187

A core is an M4 grade (strip thickness 0.30mm, core weight around 3.3Kg)
upon My calculation core is maximum 1100VA.So winding details as follows. Mains supply - 230v/50Hz
secondary Voltage req- 65-0-65
TPV- 2.53
Avareg turn length-160mm
Primary turn- 581, Length - 93M
Primary Current- 4.86A
Di of primary magnet wire- 1.63mm
Secondary Turn - 165( dual magnet wire for 65-0-65v) ,Lenth- 53M
Secon Current- 8.6A
Di of secondary magnet wire- 2.34mm
Window used by Primary(mm2)- 1545
Window used by Secondary(mm2) - 1800
Total Copper req - 4.5Kg
Copper area mm2- 3180

Magnet wire is SWG
Is upon this calculation My toroidal Transformer give me 65-0-65(8.5A)/ 1100VA or not, please help and currect if I miss somethink

Thanks
Best regards

Last edited by sanbadgujar; 26th April 2018 at 12:11 PM.
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