Really...My favorite power tube is reissue that's not widely popular


If you run 6l6/EL34 variants, I HIGHLY recommend trying this tube out.  The Tung Sol 7581A reissue.  I've had these for a good bit of time and compared them against KT150s, EL34s (several brands), KT88s, and maybe another that I'm forgetting.  They are a mere $30 a pop and they are the best tube I have heard. I know that's a brave bold statement to make as there is so much competition out there and the tube is very much under the radar from what I can tell.  

After having these around for a long time (and in and out of the amp), I had them in and was nearly spellbound one night by how great they sounded upon reentry into my amp.  I did a search and could only find one review, which I agree wholeheartedly with.  You can find it here: https://wallofsound.ca/audioreviews/amplification/6l6-vacuum-tube-review-tubes-courtesy-of-www-thetu...

I am nearly incredulous there isn't hype out there about this tube.  Simply my favorite tube.  I thought I'd pass this along as it may be much cheaper to give them a whirl then fuss with a much more expensive power cord, cable, or other tweak.  
128x128jbhiller
New KT77s at VIVA are 287 bucks for an octet...matched, free shipping, 90 day guarantee return policy, and that’s where my recent pair came from.
I put my GL kt77s back in my Rogue m180 darks and while they sounded good the kt120s are still a better match, bigger, more open with better bass control. Still open to try the 6L6 tung sol though. 

The new 5581As arrived and they sound pretty damn good already. Giving the 77s some competition around here. Nice friggin' tube....the sound seems slightly Spanish with a hint of "Jet Age" Old European potato farmer. They imply but don't overstate an extended 2nd harmonic enhancement with flamboyantly reticent outer detail that could possibly inhibit mold growth.
Wolf, downright beautiful post.  You should be a reviewer. Way better than the drivel we see in the hifi porn magazines. :)
@jbhiller you sure do like them.
I'm still running them in 2 sets of monoblocs since your first recommendation in 2017!