Here are some examples of drip or lack there of from various real spring tank sources.
00:00 - Fender 6G15 Mid
00:48 - Fender 6G15 High
01:26 - Deluxe 6G15 Mid
02:06 - Deluxe 6G15 High
02:46 - Little Kahuna Mid
03:25 - Little Kahuna High
04:08 - Surfy Bear Classic Mid
04:47 - Surfy Bear Classic High
05:31 - Element Small Tank
06:10 - Element Medium Tank
06:51 - Element Large Tank
07:32 - Uverbia
08:13 - Princeton Reverb