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Sunday, January 15, 2017

Power factor correction

Dear beloved customers, 

Please take "power factor correction" into consideration when ordering your power transformers and chokes to avoid having sagged power supply or core saturation. 

Size the VA accordingly according to simplified rules of thumb as following: 

  • For high voltage B+
    • Apply at least 1.5x of intended load
    • 2x is recommended for high fever audiophile use
    • Say 200mA DC is required, assume 300mA minimum when multiplying with the AC voltage for VA calculation.
  • For low voltage DC filament supply
    • Apply at least 2x of intended load
    • 3x is recommended for high fever audiophile use
    • Say 3A DC is required, assume 6A minimum when multiplying with the AC voltage for VA calculation.

Please ask if you do not know what or how to order to avoid under estimating the VA size due to the power factor correction required.

Best regards,
J&K audio Design

Saturday, January 14, 2017

Power cord versus power transformers

How much have you spent, or are you going to spend on your power cords? How much percentage is that, compared to your power transformer? Be honest to yourself. Don't tell me the answer. 

We've seen many that spend thousands of dollars on their power cord like nothing at all. The price paid for all the power cords connected to the CD player, preamp, power amp, power strips, and etc, would have cost more than a Toyota Camry in U.S.A. 

For those that have yet to do so, please consider upgrading the power transformers of your existing equipment first, than to lavish on such high end power cords. I'm not saying that they are snake oil. They do work, very effectively, and I've witnessed many. What I'm saying is, upgrading the power transformers would have much higher ROI than just upgrading the power cords. 

Just spend a little more, once, on your power transformers, and it will bring you a long, long way down the road. Power cords can be easily upgraded, fuses can be changed with snap of fingers (I don't even want to go down the road with fuses) power transformers are not.

There are more than just wires in a power transformer. There are a few important factors to consider in a power transformer: 

* junk grade, low grade, high grade, and extreme high grade low loss core
* lousy made in you know where, street side magnet wires, industrial grade magnet wire, and very high grade OFC/PCOCC magnet wires for audio use
* transformer design - night market seller grade, beginner grade, factory grade, boutique grade 
* winding method - no rules friend noodle type, better but still not satisfactory winding method, industrial grade, and true audiophile grade, with stringent alignment, magnet wire tension, proper insulation, impregnated type
*  finishing - no finishing, simply spray paint, industry grade transformer use paint and oven backing 
* etc that I will not go into detail

Once you do all the above right, and pay the right price for a properly made one, you will discover how much more it will give you in return, for that very little investment you made, compared to U$1-10K power cords. General generic power transformers made are not even over U$1K, mind you. You want it to sound special, go for special quality components! Audiophile components are just limited to capacitors, resistors and/or wires only, the power transformers and chokes are part (very important one too) of them.

Good ones will cost you. I will be honest with you. It will not be cheap, but it is totally worth it. You can shy away. It's your lost, not ours. Period.

It just saddens me that I often see people skimp on their power transformers, and spend all their monies on expensive power cords. Well, good luck to you, you fools. Don't complain when you discovered (at the end) why your creations do not sound as good as it could be. 

For the wise ones, congratulations, you've chosen the right path, and welcome to J&K world, go for the best, and be rewarded with the best results.

First rant for year 2017, mind me. I'm a foolish old fool, seeking my way towards audio nirvana. :P

J&K Audio Design

Friday, January 6, 2017

2017 Chinese New Year Closure

2017 Chinese New Year Closure

We will take orders but there is no production or shipping from 22th Jan'17 to 6th Feb'17. If you need to have your projects delivered urgently, please do so early.

Happy Chinese New Year! 

Thank you!

J&K Audio Design

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