Can you swap Brand A for Brand B?

Hi Jeff - sure you can. It is quite common for folks to swap out components for higher quality units to improve sound; not only on kits but on manufactured gear also. Some of the things you could look into is swapping coupling capacitors for better ones, signal path resistors for better ones and rectify diodes for ultra fast/soft recovery types.

Make sure you keep the values the same and do not go lower on the voltage /wattage rating than the component you swap out.

Regards
Paul

Thanks. Is there any book that would provide some guidance at my level of interest? I don't really want to become an ee, but if there is a good source on defining components and identifying which have more or less impact on sonics, I'd enjoy giving it a go. Jeff

ps. I just finished building an Audio Note DAC signature and I'm really very pleased with it.

Jeff, I do not know of any books that pertain specifically to tweaking/modding amps.

However there is a lot of information on the net. Arthur Salvatore has a nice intro into modding tube equipment, which you may find helpful when starting out. I found a lot of useful information on bulletin boards and many time builders (both private and commercial) give tips on their web pages.

Also there are a couple of capacitor shootouts on the web. Have a look at http://www.vhaudio.com/21capacitorshootout.pdf and http://diyparadise.com/cap/dare_to_compare.html. There are many more.

Regards
Paul