What should crt test values be?

[ohohyodafarted]

I have a B&K 465 crt tester. I havent been active in vacuum tube electronics since I was in my teens 45 years ago.

I am collecting old B&W tv's with rounc crt's. I have 9 so far. The most recent is a nice DuMont 19" RA110.

My questions are this,

1. My B&K has a scale that reads from 1 to 1000 and the bad area on the meter is from 0 to 200. Good is from 200 to 1000. When a crt is new, or freshly rebuilt what should the crt tester read for emmission.

2. When I tested the 19ap4 in the DuMont it showed no emmission. I left it on the tester overnight and the next day it read about 500. It takes about 30 minutes now for the crt to slowly reach that reading. Is that a sign that the crt is no good. I have an RCA with 16gp4 that also acts like this.

Just wondering what a good crt should read. Not just a usable one, but a GOOD one that produces an excellent picture.

I recently bought a 12lp4 on e-bay for one of my sets. The seller claimed the tube was "excellent" It only reads 500 on my tester. Is that what an "excellent" tube should read? I am Holding back on giving this seller his feedback until I get an opinion as to what an "excellent" reading really is.

Thanks for your input.