Tubes: 5687 / 7119 / E182CC How to Test Them?

Some of your info is wrong. 5687 is different from 7119, so not all of your suppositions can be correct. I will check it out when I roll out of bed.

By the way, the final authority is a tube data manual, not Qvortrop. RCA or other.

The fog of sleep is lifting.

5687 = 6900

6922 = 6DJ8 = 7044 = many more (once I look in my RCA Tube Manual, I could find more; this is from memory)

7119 = E182CC

But none of these three types that I have separated by line spacing is equal to any of the others.  What they do have in common is very high transconductance (but different as indicated by line spaciing) and the fact that they all can be plugged into the same tube socket (because their pinouts are the same).  To ascribe a SQ to these tubes without regard to the circuit and to suggest that you can compare 5687 to 7119 (for one example) without regard to the circuit, is folly at best. 

Hi , random thought. I have a pre that uses 8 - 6H30’s and a tester that does not accommodate this tube. I live in a fairly large city but lack a Stereo club. However most large cities have a Short Wave/ Ham Radio group and those old codgers have a lot of tube gear, and testing equipment. Just a random thought from my scattered brain. Regards , Mike B.  

6H30 is in that group of high transconductance tubes that I separated into 3 lines, but as I recall it is distinctly different from any of them, by at least a little. Maybe closest to 6922 but not identical. With my ancient HIckok 533A, I can "test" those tubes in that I can stick one in the appropriate socket and get a reading for transconductance, BUT I know that reading is not applicable to actual use conditions, because I know the power supply in the Hickok cannot supply the current and voltage necessary to simulate actual use conditions.  I have to use the widest range of Gm on the meter (there are 3 selectable ranges) and even then a good 5687 or 6900 will peg the meter. If it does not peg the meter at its widest setting, there is something "off" about the tube. That's the best I can do with the 533A.