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
I’ve been listening to the TS 7581A’s this weekend in my Primaluna Dialogue Premium HP amp. I agree with a number of comments particularly in regards to being more revealing. I was quite surprised by that. So revealing in some instances it was like hearing a slightly different version of a song I may have heard a hundred times before. Bass is tight and extended in comparison to the stock EL34’s, but, I think I prefer the roundness of the bass and the midrange flow with the EL34’s. They seem bigger sounding and fuller in my setup. I only have 10 or 15 hours on the 7581A’s so I’ll give them a good baking before coming to any final conclusions. I consider myself a “jet age, old European potato farmer” kind of guy so I’m keeping my fingers crossed.
Just got the 7581A  tubes today.Very nice.Smooth but lively.Good bass too.This is right out of the box.Very impressive!Thanks jbhiller:)
Just just ordered a quad of these today from Viva $92.00 with shipping   Hoping to hear those intrinsic organic overtones and supple extended high frequencies associated with these tubes. All kidding around aside the  VIva website lists these as KT 66  Variants. Looking forward to hearing them as I haven’t listened to my tube amps for almost two years
This tube is becoming wildly popular. How ironic. And I agree they sound great right out of the box...in the box, not so much.
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!