Pros: If you use the smallest PT tube, you might save a few bucks.
Cons: A lot of work, a lot of cables. Can look messy, especially if you’re powering the largest tube.
Verdict: If you’re using the smallest tube (PT), it might be worth your while, as you only need three laptop adapters for recommended operating voltage of 57 volts. For the larger tubes, many more adapters are required. There will be a lot of cables, a lot of work, and you won’t save any money. With the current price of over the counter power supplies, building your own is not worth it for the ST or the BAT tube.
Instructions on making your own power supply:
http://rife-beam-ray.com/PS1/index.htm
http://www.frex.com.au/ssq-ps.html
I will not list the parts for this, as you can easily see the required parts from the links above.