I have a couple of testers, the one I have been using is the 546, it looks a lot like the TV--7 and I'm not certain of the differences. Due to downsizing I no longer have any tube gear and my degrading sight I'm not able to do much in the way of repairs. If anyone is interested it's listed at thetexasauctionhouse.com lot 151.
It was cleaned, serviced and calibrated but has been in storage for five years. If you need a tester take a look. There is another tester that works as well as parts and test gear from my bench.
I hope someone finds this as usfull as I have over the years.
David