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
Take them out of the box? This explains why I’ve been getting cardboard build up in my tube sockets...thanks for the tip Wolf!
Just got my quad of these today and listened to them for about two hours.  very impressed thus far.   Is there any break in time associated with these and any audible difference over time.  Associated gear is are Modified Eico HF20 JWN amps
@metman Not a huge change as they burn in but they do loosen up becoming less dry and more open.
The blue glow actually got a little bluer after a few days, so there's that, and after however many weeks I've had 'em I've become even fonder (is that a word?) of these things. A classy tube.