Hello TB. It's been almost a month since put fresh tubes in my SWR Interstellar Overdrive pre. I bought it brand new and it has been my primary amp (paired with a Crown XLS 1500) for about 10 years. It's dated 9/2004 and still had the stock Sovteks. I've noticed quite a difference in sound/output over the past year, so I figured it was time for a fresh set. This was the first place I came to get info about manufacturers, tube types, etc. I learned a lot and just wanted to share the results with other Stella owners since there were limited posts about rolling tubes through these amazing preamps. Based on recommendations found here, I had narrowed it down to the new production Mullards, Tung-Sols and JJ's. I did some shopping around, read some reviews, and decided to just roll them all until I found which ones I liked best. I came across a 24 hour sale and found a decent price on a gold pin 12AX7 Tung-Sol and the Tung-Sol EL84's - right at $35 incl. shipping - so I snatched them up and put them in. First, I'm no tech or amp expert, so I can only attest to the difference in tone that I was able to notice from listening/playing through the amp before/after. For reference, I'm playing either a US G&L M-2500 or a US LB-100 through Eden D210 XST's. Having said all that, the more those Tung-Sols burn in, the happier I am with the sound. Stella has an even more gorgeous voice than before...across the whole range. The mud-butt is gone and the highs aren't brittle or harsh anymore. The lows are a lot more focused with much sweeter and pleasant sounding mid-highs. I use a Darkglass Vintage Ultra V2 to do some light tone shaping, and I'm finding that the knobs are all getting closer to 12'o clock as each day passes...no need to boost the lows or the cut the mids. Also, it seems as though the tone controls on the IOD itself are a little more responsive. I bypassed all of my FX, did a sweep with the Aural Enhancer, and was pleasantly surprised at how good the amp sounded on its own now. The LB-100 really sounds fantastic this way and I'm pretty excited to see how Stella sounds as a D.I. for recording. I will say, there is A LOT more crunch on tap now. I've got the drive set about 2 notches below 11 o'clock, and I'm getting the best Jamerson/Motown tone I've ever gotten. Bring it up to about 1 and crank out "One More Red Nightmare" with some serious growl. So, there was definitely a big improvement in the drive/distortion area as far as tone and articulation. Overall, I think I'm pretty happy with the Tung-Sols, so I don't think I will go changing them out any time soon and I would definitely recommend these to anyone in need of fresh tubes for their Interstellar OD. Oh, and just in case there are any 'tube warmer' folks out there. I run an EHX Black Finger in the first slot of my FX board as a tube warmer (comp. off). It was in need of fresh tubes too, so I replaced the stock EHX 12AX7's with Tung-Sol 12AX7's as well. It transformed into a completely different pedal...much smoother sounding, yet still beefy. The TS's also cleaned up that nasty high-end hiss from the output stage, plus, the comp section is A LOT more usable now as it seems to be more articulate and not as muddy sounding. One last thing. I just wanted to say thanks to all the folks who ask great questions and/or share their knowledge on TB. This is a great resource and it's awesome to have a place to go where you can find out practically anything you want to know about the ever-expanding bass world. Keep it up folks.