I'm probably flying fast and loose with the term 'drama series' because some of mine could be considered sci-fy, detective, action, etc... But I'm including any tv show that has regular drama in it.
Also, I'm limiting these to night-time only. Daytime soap operas are a whole category into themselves IMO.
Mine:
1. The Waltons
2. Dallas
3. Star Trek TOS
4. Murder She Wrote
5. Friday Night Lights
6. Mad Men
7. Knots Landing
8. Little House On The Prairie
9. This Is Us
10. Melrose Place
11. Family
12. Adam 12
13. Barnaby Jones
14. In The Heat Of The Night
15. Charlie's Angels
16. Columbo
17. Falcon Crest
18. Marcus Welby MD
19. Touched By An Angel
20. Perry Mason