Hi Wayne; Have you or anyone out there actually done these mods? If so are they reliable? And last do you happen to know if RS still sells these meters; they seem to have cut back on a lot of the audio stuff, you can't even get outboard speaker binding posts anymore. Those links to posts are really helpfull. May I ask; if you were to propose a simple but accurate within reason; system for TS measurement; one you could trust to provide reasonably accurate readings within the constraints of the hobbyist resources(I mean w/o having access to anechoic chambers etc.),considering that you have a fairley powerful computor that could be dedicated to this pursuit as well as the room to perform the required measurements and somewhat effective isolation measures in place(whew!). What would you tell the novice in regards to setting this sort of system up. Any good tutorials and sites. I know about all the programs available but many do not address the issue in it's entirety. I have accessed some of the posts on this site but have not organised them into a thorough plan.