Thanks! Aside from the construction differences, between the two Chatham sets that I now own, the difference in sound is there but (to my ears) it is a minor one - the ones with clear top, double bottom d getters and grey domino plates sound a bit more airy whereas the ones on my amp (smoked top...

I recently got a great deal on an ebay auction for a small batch of chatham 5998s. However they are quite differently constructed compared with the chatham 5998s that I already have in my amp. The ones from ebay have clear top ends, double bottom D getters, grey plates and “pigtail” filament...