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
7591 is a 19 watt tube with different pin layout from a 30watt 6L6/EL34/7581.
Anyone try  TS 7581A’s in a Music Reference RM9?  RM9 accepts KT66, EL34 and KT88's... so not sure if the Tung Sol 7581 is compatible.
As I stated here before, my favorite among popular tube types are 6L6 and KT66 for pentode/tetrode tubes.  For single-ended triode amps, I like 45s and 2a3s.  For less common types, I like the 349 (a tube I run in my pushpull amps) and 350 (similar to 6L6).  For super rare tubes, I heard an amazing amplifier that ran the 252 meshplate tube.

I've been running an octet of 7581A in a Primaluna Evo 400 power amp. I do like them more than the original EL34 in my system. Sacrifices just a smidge of midrange magic for better low end meat and upper end presence. Just a nice balance from top to bottom. 

Enough to make me want me to keep the Primaluna. 

 

Would the 7581A be biased the same as a 6L6GC/KT-66? I am currently running KT-88s in my DeHavilland 50A mono blocks and would like to try the 7581As. The DeHavilland is designed to accept 6L6/KT-66 tubes and a bias setting for those is specified in the owners manual. Would it be safe to assume that the same bias setting be used for the 7581A?