512-J201 J201 Fairchild Small Signal Transistors
TO-92 .$ 0.320
781-J201 J201 Vishay/Siliconix N-Channel FETs
TO-92 25V 0.7mA $0.53
Of the two, which would be more ideal for Distortions such as Joe D's proj like the vulcan or Thunderchief? Or for that matter, many of Runoffgrooves's projects?
There is no way to know ahead of time. The worst thing you can do is to trust someone else's opinion of a sound.
In fact, the manufacturers themselves will only guarantee that the devices are within the min/max ranges of specifications for that device type. Those specifications vary from batch to batch within the same manufacturer and across manufacturers. None of the items on the guaranteed spec list mention anything about tone, or perfection for a purpose.
Pay your money, try it out, and if you don't like what you get, keep looking.
I have tried them both. Both are good.
I just bought several items from this guy. He combined the shipping and kept it cheap. The package got here (FL) in maybe 3 days from CA. well wrapped and in static safe bags. I'm happy with the product and the service and I'll buy from him again.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4666&item=3820794434
Clay Jones