Tube Links

CILM AND MPT are gone you will not be able to replace tubes you bought there unless they were Keith Garvey & Elias
PTE & CDO replaced these two stores and they do license exchanges on the more popular artists
if you have proof of purchase like your receipts
There are also other companies:

PFD - http://picsfordesign.com/ - They have lots of free tubes for anyone interested
AIL - http://artisticallyinclinedlicensing.com/
DSI- http://www.dreamscapeimaging.com
UYA - http://www.upyourart.com/
ADI - http://www.artisticdreams.us/free_to_use_info.html
MTA - http://www.mytubedart.com/
STOP - http://www.psptubestop.com
AOG (FAB) - http://fabulousartbeginnings.com
SATC - https://www.scrapsandthecity.com/store/
PSP PROJECT - http://www.thepspproject.com/index.php?main_page=index&cPath=1
Independants

Myka Jelina - http://www.mykasgraphics.com/
Jo Lynch - http://jolynchtubes.com
Dominic Marco - http://dominicmarco.blogspot.com.au/
Ismael Rac - https://xeracx.net/
Arthur Crowe - http://www.arthurcrowesfactory.com/store/
Sweet Melode - http://swtmelode.com/
Gary Rudisill - http://www.cherrygurlz.com/
Craig Wentworth - http://www.looks-can-kill.net/psp/psp_tou.html
Josh Howard - http://psptubes.net/
The Hunter - http://apocalipsstudiohunterstore.com/store/