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Anyone have experience with the Tung Sol 7581a vs. EL34, KT66, KT88, 6L6

I broke down and added another power tube (Tung Sol 7581a) to my collection.  That can get expensive as my Primaluna Dialogue HP Premium integrated has 8 power tubes.   

Why has this tube escaped me thus far?  Why is it not more popular?   Many folks don't sell this reissue tube.  

I think this is a great deal.  I was torn between the lush, thick midrange of the EL34 and the more evenly spread out sound of the KT88.  But the KT88, for all its more correct behavior didn't romance me like an EL34.  

The 7581a from Tung Sol can be had cheap and I really like them.  [I'll spare you all the audiophile terms].  They check the boxes that I was looking for. 

Does anyone have experience, information or knowledge about this splendid tube?  

PS  The next experiment is KT150s but I can't see doing it if I'm gonna lose any of that great EL34 midrange. 
128x128jbhiller
jbhiller's avatar
jbhiller OP
1,361 posts
 
I bought my 7581a's from a guy in Ohio--cleveland area-on Ebay.  He tests them and does a 48 hour burn in.  They were so cheap compared to others I have bought.  I'm not rolling these out since rolling them in. 

Also, as my 6 year old likes to point out--they have a blue glow in addition to the traditional incandescent glow.  Very cool. 

Noromance, I'm curious to see if you like them.  I'm going to call upscale and ask Kevin why he doesn't stock these tubes.  
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jbhiller OP
1,361 posts
 
@rshak 
I bought them from this seller on eBay--here's a similar if not identical listing from her/him.

https://www.ebay.com/itm/Tung-Sol-Factory-Platinum-Matched-Quad-7581-7581A-6l6-type-tubes-24hr-Burn-...
rshak
416 posts
 
Thanks, jbhiller.  I found the listings based on your earlier post that the (eBay) seller was in Ohio.  He does seem to stock a lot of interesting, reasonably priced tubes and has excellent feedback.

I may take the plunge and buy the 7581A's, and I may also pick up some 12au7's and 12ax7's for spares.

Thanks again
noromance's avatar
noromance
9,474 posts
 
I tried them last night. Impressions:
Out of the box a little dry but extended in the treble. Very good bass. Clean and powerful sounding making my 1960s 6L6 Ratheon black plates sound a little tired. They did lack the sweet midband of the older tubes but they only have a few hours on them. Overall pretty impressed.

rshak
416 posts
 
Thanks for the prelim review, noromance.  Please post a follow-up after you've lived with the tubes for a while.
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