I'm not a technical person, so I don't understand all the ins and outs, but I've been through this NOS tube "popping" thing, and if the transients from the popping are hard enough, they can damage something downstream. I've blown resistors in my amp from tube popping in my pre-amp twice. It's expensive and frustrating. So now, the moment I hear popping start, I take the offending tube out and send it back. Whether you have damage downstream (and I've heard of speakers suffering as well) may depend on your equipment. For me, I no longer want to risk it.
popping sound with new 6922 tube
I am new in the tube world. I just replaced Siemens 6922 tube with Phillips. When I turn the preamp up for the first time in the morning, I get a popping sound (probably from tube) after a couple of seconds. A noise is delivered to speakers, too. Is it ok? Will it disappear as the tubes age? Or should I get a different pair? Thanks for your help.