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Any experiences with Tung-Sol 7581-A? (Read 1695 times)
out-of-step
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Any experiences with Tung-Sol 7581-A?
09/08/18 at 18:32:19
 
Hello. If I may, has anyone tried a Tung-Sol 7581-A in anything and have any opinions or impressions to share? Particularly in comparison to other current 6L6-family production. This isn't for use in a Decware unit (indeed I'm not sure if it's suitable for any) and I understand actual performance will vary, but some traits may transfer and as there's a lot of general tube experience about I thought I'd ask here.

(If unfamiliar with the 7581-A, tube depot offers the following description: "This is not just ANY 6L6GC replacement. The Tung-Sol 7581A is an upgraded version of the Tung-Sol 7581. It offers an impressive amount of clean headroom and boasts a plate dissipation rating of 35W.").
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Jeff of Arabica
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Re: Any experiences with Tung-Sol 7581-A?
Reply #1 - 09/08/18 at 18:49:05
 
Archie and Stone of Tone both have experience with this tube.  You can find comments on their experience with it in their ZMA's here:  http://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1414696035/482#482

You may need to sift through a few pages to find all that has been said about them.
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Re: Any experiences with Tung-Sol 7581-A?
Reply #2 - 09/08/18 at 19:26:19
 
Ah thanks. The search didn't seem to be working right - a lot of seemingly irrelevant results with summaries starting in "Welcome Guest." Glowing (no bad tube puns intended) praise there for the TS 7581-As. Also some good info in that thread on bias/voltage; will take some notes in case I get into that.
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Re: Any experiences with Tung-Sol 7581-A?
Reply #3 - 09/11/18 at 17:00:39
 
Update: After seeing the impressions here and about, I went ahead and bought a matched set from tubedepot. After arriving here so fast some of their quantum matter may still be in Tennessee, I gave 'em a go yesterday eve. My impressions fully agreed. The amp evidently loves 'em. They appear well made. Daynamics are effortless. Most importantly to me, the tone and detail are rich and lovely, free of grain. Keepers for certain.
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Lonely Raven
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Re: Any experiences with Tung-Sol 7581-A?
Reply #4 - 11/21/18 at 06:25:22
 
I put a set in my ZMA as well, and am enjoying them. Probably the best bang for the buck I've found for the ZMA lately.
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orangecrush
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Re: Any experiences with Tung-Sol 7581-A?
Reply #5 - 01/21/19 at 01:09:24
 
Anyone know if this can be used in the Torri Mk3?

So far Gold Lion KT66 are working well for me.  But these look like they would improve the lower end, keep the same mid range richness, and add some clarity on the high end.
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Jeff of Arabica
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Re: Any experiences with Tung-Sol 7581-A?
Reply #6 - 01/21/19 at 01:29:51
 
Yes it can.  It has a similar plate to the KT66 and therefore can be used in the Torii MKIII.  However, its plate dissipation is 35W which is higher than the KT66 and can thus be biased higher.  I have not run these tubes but have run the 7027A's which you can also run in your Torii with amazing results.
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Archie
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Re: Any experiences with Tung-Sol 7581-A?
Reply #7 - 01/21/19 at 02:00:57
 
Would the bias window need to be reset like you can do with the Tori Jr?  Or can it be used as is?  

I'm just throwing in my 2 cents just in case.
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orangecrush
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Re: Any experiences with Tung-Sol 7581-A?
Reply #8 - 01/21/19 at 02:12:54
 
Thanks Jeff, I will check out the other tube you mentioned as well.
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Jeff of Arabica
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Re: Any experiences with Tung-Sol 7581-A?
Reply #9 - 01/21/19 at 03:48:00
 
Archie, the Torii MKIII has auto-bias so the user cannot adjust the bias, which is unlike the Jr. which requires biasing with a multi-meter when replacing output tubes.  

Thanks for mentioning that as it makes my prior comment about a the higher bias possibility of the 7581A irrelevant to @orangecrush.
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orangecrush
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Re: Any experiences with Tung-Sol 7581-A?
Reply #10 - 01/21/19 at 05:07:54
 
Hey Jeff, for the Torii, which would you reccoemnd, the 7027A's or 7581-A’s?

Assuming both are Tong-Sols?

Thanks
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Jeff of Arabica
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Re: Any experiences with Tung-Sol 7581-A?
Reply #11 - 01/21/19 at 05:59:37
 
That is a question I am really not qualified to answer.  I say that for a couple reasons.  First off, I have not rolled either through a Torii, although both would work.  Secondly, I have only rolled the 7027A's through my ZMA, but others have had great success with the 7581A's in their ZMAs.  

So, I really don't think you can go wrong with either.  If the decision is too troubling, just flip a coin.   Grin
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orangecrush
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Re: Any experiences with Tung-Sol 7581-A?
Reply #12 - 01/21/19 at 18:13:12
 
Smiley At least there cheap in comparison to other tubes!
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