So in the ongoing saga of my Western Electric 300b, I got my replacement WE300b yesterday, and put them into my HA-300, which has been running dead silent w/ the stock TJ Full Music 300b when no music's playing. Sadly, the left channel tube (the working original WE300b) does have a low-volume radio static kind of noise that's particularly notable in the first 10-15 minutes, although it can kinda come back later, but much harder to hear.
The replacement 300b does not make this noise.
Last night, right before I went to sleep and with all the lights off, I noticed that the WE300b gives out a glow, so I took this photo from my phone (Huawei P40 Pro rocks in low light!). I sent that photo as well as what I'm hearing from the original tube to Western Electric's support.
They called me the next day. Turns out Western Electric 300b suppose to have a blue glow, BUT only in the top portion just like the replacement tube on the right. The glowing gas in the left meant that it's leaking or something because that gas is spreading downward. So they told me to send another RMA and they'll send me another replacement tube.
Other than the low, low level noise from the left channel tube, the tubes do sound great, and the support and warranty from Western Electric is world class. 5 years warranty with 90 day return goes a long way to keep me as their client. I'm looking forward to the 2nd replacement tube.