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Tony's latest traffo DIY build
Tony's latest traffo DIY build
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Old 19th March 2021, 09:43 AM   #1041
TonyTecson is offline TonyTecson  Philippines
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Location: Maybunga, Pasig City
Quote:
Originally Posted by Kay Pirinha View Post
Wow, those are monster C cores! What power capability would your estimate at 50Hz grids?
Best regards!
this was from an isolation traffo rated for 1000watts/50 hz...300 watts at 30 hz is a reasonable expectation imho...
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Old 23rd March 2021, 01:36 PM   #1042
gorgon53 is offline gorgon53  Finland
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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)

Last edited by gorgon53; 23rd March 2021 at 01:46 PM.
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Old 24th March 2021, 12:40 AM   #1043
TonyTecson is offline TonyTecson  Philippines
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those were 6kg a piece ....thanks gorgon53
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Old 12th June 2021, 08:45 AM   #1044
mariogert is offline mariogert  Netherlands
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Quote:
Originally Posted by TonyTecson View Post
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






completed, there are 3 chokes sitting on top, 1/2inch, 5/8 inch, aqnd 3/4 inch.


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
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