The RTCs I sent to you were Cryos. I am not sure where I got this, but I had it saved on word to show a friend after he called me Han Solo:
[size=small]Cryogenic treatment is a process where a product (VACUUM TUBES)is tempered in a deep freeze process(-300F) for 48 hrs. This process produces a permanent change in the metals inside this product making it stronger and longer lasting. Tools, instruments, knives, razor blades, machinery parts have been Cryo Treated for many years.Why do this to tubes?Tubes are mostly metal inside so Cryo treating tubes has the following benefits: permanent change in the metals at the molecular level(more uniform grain structure of metals), longer lasting, tightens internal parts of the tube allowing for more efficient operation. and superior conductivity![/size]