Thanks, gonna order a pair to try this week! I just tried mine with the JAN Phillips 5751 in V1 and the Ecc83s in V2. Diggin it so far!
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Checking in to say another 5751 believer here. I was about to sell my Streamliner 900, it's just too fat, too much bass, not quite fast enough, could never get a growl out of it. After reading the tribulations here, bought myself a JAN Philips 5751 and can't believe what a difference it makes! Actually, it's kind of subtle, but it's subtle in a place that makes a huge difference: like everyone says, it tightened up the low end, and gave the sound a general clarity. But what I wasn't quite expecting is the punch it has now. Maybe the punch was always there, somehow occluded by all the roundness of the sound, but the STM900 with a 5751 in V1, at least in the practice room, is a growling punch machine. Something else I wasn't expecting: I can dial in a Stanley Clarke sound! There is still a huge amount of treble and brightness with the 5751. And even though the low end is tightened up, there remains a ton of bottom there. Crank the lows and highs, and cut the mid, and boom: Stanley. The short of this long-winded missive is that the STM900 becomes a massively more useful tool with the 5751 in V1. GB really ought to look into putting in this tube as stock.
Anyway, can't wait to get it onstage.
Thanks guys for the recommendations about this mod. Definitely worthwhile, unless you already love the sound of the STM, in which case you're set.
Thanks, gonna order a pair to try this week! I just tried mine with the JAN Phillips 5751 in V1 and the Ecc83s in V2. Diggin it so far!

This tube selection is popular
V1 - NOS Phillips JAN 5751
V2 - Tungsol 12AX7
V3 - Tungsol 12AX7
This tube selection is popular
V1 - NOS Phillips JAN 5751
V2 - Tungsol 12AX7
V3 - Tungsol 12AX7
This tube selection is popular
V1 - NOS Phillips JAN 5751
V2 - Tungsol 12AX7
V3 - Tungsol 12AX7
I have the same setup except I have the original V1 Tube in V2 now. I thought it made the miss a little hotter. I may have to pick up a second Tungsol 12AX7 just to give it a whirl.![]()