Revisiting the CJ ET3 SE

[Forte 4A]

Last year I demoed at home the ET 3 SE. It did not go well. The tube as faulty and I also (my fault) forgot to invert the speaker cables. This time totally different. Also I had changes in my setup. The modified Threshold amps were replaced w/a Bryston 2.5 and the Dynavector p75 MKIII phono was replaced w/Shaker Logic phono (currently only 4 built locally in NH). I took it home for 4 days and was totally impressed. Excellent soundstage plenty of air between instruments and lots of detail even for low late night listening. What made the deal sweeter was the dealer sold me the demo unit so I saved a big chunk of money. The unit sounds great but is it true that it takes 300-500 hrs to fully break in. Currently it has the EH6922 tube. Any other tubes that you may have used?