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I have a Son of Q Jr.

I believe it is a 10 amp transformer and the Son of Q is a 15 amp xformer. The son of Q Jr. was my first balanced power transformer experience, and I used it on my entire system for quite a while. At the time I was using it, all of my components (including amplifiers) added up to just under 400W of AC power consumption. There was never any sign of stress or strain from the tranny. The system was never restricted in dynamics or loudness compared to plugging it in straight into the wall either. The sound was just noticeably quieter, blacker backgrounds, and less electronic sounding. It is perhaps the only real AC tweak that I have tried that makes an obvious improvement.

As far as calculating the load, all I did was look at the owners manuals (or the back stickers) of each piece of equipment and add up the AC wattage consumption figures. It was that simple. I think that if you want to use a balanced power transformer and also sleep well at night, a good rule of thumb would be to stay around 50% to 75% of the rated power and you'll be fine. It is also recommended that you don't use them for lighting.

If you can spring for the difference in price, the BPT products are very nice too.

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