popping noise from my speakers

all PS audio electronics

Have to be both channel tubes to go faulty at once, highly unlikely. Don’t think PS Audio use common rectifier tubes for both channels, think that stage is all solid state.
The only common thing to both channels is the transformer, I doubt it’s that
https://www.stereophile.com/images/617ps.ins.jpg
https://i.pinimg.com/originals/df/f6/e4/dff6e4d089c2fd09309a560a722e52a6.jpg
Cheers George

If it's in both channels, chances are it's in the digital domain of the source, or if you amp is stereo and a common smp power supply for both channels it could be that also.

Cheers George