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Old 17th October 2014, 04:08 PM   #1
msj965 is offline msj965  United States
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Default Transformer for K12g tube amp

Hi
Just wanna ask this Q's regarding diy k12g transformer. I'm gonna send it to the Philippines running @ 220 volt. can you pls give me an idea w/c budget transformer to use so I can buy it here in states.
Thanks and more power!!!
Ann
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Old 20th October 2014, 05:20 AM   #2
nosbor is offline nosbor  United States
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I'm running this one in my K12G:
AS-1T175 - 100VA 175V Transformer - AnTek Products Corp

The 175v taps are in parallel, the 6.3 taps are in series.

But even that's rated to 230.
It's certainly not a plug and play change. I had to add another resistor to the CRC, 400 ohm, 50w, I think dissipation was around 15w. And I had to change the bias resistors to 330 ohm since the plates started glowing red hot. I also added a .5 ohm resistor to each of the heater taps.
But that was all for 120, I have no idea how 220 would effect the output voltage of that transformer or exactly what changes you would need to make to the amp.

Have you considered something like this:
Amazon.com: Seven Star F200 200 Watt 220/240V to 110/120V AC Step Down Travel Converter: Electronics
It's cheaper than the transformer, and 200w should be enough for the amplifier. The K12g is fused at 1.5A -> 1.5a * 120v = 180w.
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Old 20th October 2014, 06:20 AM   #3
AJT is offline AJT  Philippines
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Location: Palatiw, Pasig City
Quote:
But even that's rated to 230.
line goes to 230 volts at times, so that is no problem...i would have chosen a traffo that can run 240 volts also...

Quote:
Originally Posted by msj965 View Post
Hi
Just wanna ask this Q's regarding diy k12g transformer. I'm gonna send it to the Philippines running @ 220 volt. can you pls give me an idea w/c budget transformer to use so I can buy it here in states.
Thanks and more power!!!
Ann
it will be much cheaper to get the power transformer made in Manila for local voltages....that much i can assure you, if you can give me the schematics i can come up with local cost for you....
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