[drh4683]

I have both a CR-70 and CR-7000. I got lucky and got a good CR-7000 off ebay on the first try about 5 years ago. You may have bad lytics in your 7000. These were made in the late 90's and early 2000's which was that era of "bad caps" that was plaguing electronic equipment at the time.

But, like some have mentioned, I too like the CR-70 the best and is my "go-to" tester for most applications. I trust it's readings the most.
The CR-70 only has four adjustable grid bias settings. The CR-7000 has many more grid bias selections. However, I think the 70 is a bit more accurate. I think the CR-7000 makes some "good" tubes appear to be weaker than they really are which can potentially lead you to unnecessarily rejuvenating a CRT. This is because the set up specs on the 7000 require what I believe are excessively higher grid bias settings vs. that on the 70 for the same tube. Thus, the more grid bias you put on the tube, the less cathode current, thus a "lower" emission reading.

The 7000 does not have the 21" round screen test socket. You would have to use the "universal adapter" which is basically an adapter with individual clip leads so you can clip direct to the pins. The CR-70 has both "older" and "newer" versions. I spoke to a rep at Sencore a few years ago and they said the CR-70 was in production from 1982 thru 1996. If you want a CR-70 with the "#7" 21" round screen color tube socket, you need an older CR-70 unit built 1987 or older. The newer ones did not include that socket. Sockets are NLA through Sencore, but otherwise, many of the parts are still available through them.
The CR-7000 was introduced in 1997 and was in production thru 2006. It is much different electronically than the 70. It has a digital logic for rejuvenating tubes with timed pulses. This is to prevent cathode overheating and damage which works well and is effective. I do like the three LED bar graphs on the 7000. It is a nice instrument, but I still like the 70 best for working on the older sets. Nothing beats a good analog meter.