10-10-14: BifwynneNot just to other system components as well but to everything in life.
Knghifi ... your comment applies not just to amp/preamp combos but to other system components as well, such as speaker and tube amp matches.
If your house has no access to natural gas, would you buy a natural gas furnace? Post purchase, install propane and all the hassles in getting it to work.
Just common sense.
This is no knock on Pakwong and he has learned his lesson. Sometimes we all have to learn the hard and expensive way. Like the time I was the general contractor building my house with no prior experience. Bought the land ... cost me BIG $$ but very valuable lessons.