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I recently acquired some nice NOS tubes that I was told were 12au7's. They say 12au7WA on the label, with no other numbers other than 6318 down the sides.
My issue is that my amp can't use 5814's, and these pins are identical to some on eBay that are advertised as 5814's. ( http://www.ebay.com/itm/4-PCs-GOLD-PIN-NOS-12AU7WA-ECC802S-ECC82-12AU7-5814-SYLVANIA-GB-BLACK-PLATE-TUBE-/401194455393?hash=item5d690d9161:g:hakAAOSwPCVX5fHh )
Any thoughts?
Thanks very much.
Tom
Follow Ups:
I dont know if you got the answers you expected or answers that confirmed your expectations. But, from the answers in your post it is obvious that the 5814 is for all "practical purposes" a good sub for the 12au7. So, it makes me wonder why your tube guru would make such a statement.
If the company that makes your amp is covering their butt by not recommending that tube then simply wait until your warranty expires before trying it. And if the amp blows up by subbing 2 5814 that pushed the power transformer over the top and caused it to fail then i will have to say that it certainly was not a well designed amp. Any engineer, worth his salt will build in some leeway into the specs to allow for out of spec components, including tubes, and this will allow greater reliability and longevity. So, if your amp uses 12au7, the 5814 will not cause your amp any harm. cheers.
Edits: 11/08/16
If it can use 12AU7 tubes, i don't know why it can't use 5814. So, you have to tell us why.
The 5814 draws a bit more heater current than a 12AU7 - 25 ma. more with 12.6 volts and 50 ma. more at 6.3 volts on the heater. I guess that COULD be why but that would be strange unless there's a bunch of them and the cumulative increase would be a problem.
I've never heard of any case where they wouldn't interchange either. I'd be curious about why myself.
I was told that I'd be taking a chance of overloading the power elements if I used a 5814. (My amp is an Audiomat Solfege Reference, in case anybody has actual experience with it and 5814's. . . .)
The 12AU7 and 5814 are pretty much the same. Minor value differences.
So, if your amp can't use 12AU7's..it can't use 5814s either.
12AU7, 5814, 7316, ECC82, 6670, 7489, 7730, CV4003 comprise this family.
I am unaware of a 6670 tube. I think the mention of the 6670 here is a typo. The 6680 is a 12AU7/ECC82 equivalent.
It's not a typo.
Look it up.
Howdy JSTRM. That's interesting. Before posting this I thought to see what a 6670 is. I went to Tubeworld's website. They list about everything but no 6670's. I also tried Frank's Data Sheets website and also found no mention of this tube type. Wondering what source you used that describes 6670's? Thanks.
OK this is getting more mysterious by the second. I thought I was correcting an understandable typo. And researched and found no mention of a 6670 in Frank's Data Sheets website (which is a fairly inclusive resource of datasheets for most all tubes) prior to mentioning what I thus assumed was a typo. Also nothing in the RCA Receiving Manual.
Joe's Tube Lore lacks mention of 6670's. An Internet search turns up a book about tubes titled Tube Lore so presume this is the mentioned source about 6670's. If so it may be the author mistyped 6680 as 6670 as via google and other searches I found but a few mentions of 6670's which but stated they were substitutes for 12AU7's. Seems odd that 6670 datasheets seem no where to be found.
All this is no big deal but it would be nice if there was a relatively unknown and likely inexpensive tube equivalent to 12AU7's. Does anyone have a datasheet for or can provide a weblink for one? Thank you!
George Fathauer in his book "Electron Tube Locator" lists the 6670 as a 12AU7 type but lists only "various sources" as his reference.
I've used the GE 6680. Think it's a selected 12AU7 for low-noise. Tone-wise = blah. I have not heard or seen a 6670.As for tone... the CBS-Hytron 5418A and 7316 are my standards, as US tubes. Philips, S/H, Valvo E82CC or TFK ECC802S, as European made tubes.
Rare 12AU7 variant is the CBS-Hytron 7318. Wish I had stocked up on a few more sleeves, 20 years ago. 8^(
Edits: 11/06/16
should be able to use those?correction: could he use those!
I do see from the answer below it's a NO. Thanks
Edits: 11/07/16
I've used 7730 and 6189 --- IIRC, nothing special, tone wise. I only look for good 5814A and 7316, in all-numbered 12AU7 sub-types.
Edits: 11/07/16 11/07/16
Thanks.
Clarification: My amp guru said that the 5814 requires slightly more current draw than the 12au7; the amp is designed for the 12au7's draw and not the 5814's.
Any ideas about this particular tube?
If the extra .025 Ampere filament current will somehow damage or disrupt the function of your device you definitely need a new amp "guru."
Almost all manufacturers or techs on all levels, will step away from saying a replacement product is ok --- if it doesn't meet exact same OEM standards.If the unit fails for other reasons, it's hard for the manufacturer or tech to deny a warranty, if he said it's ok to use a replacement part. Even if the real problem is not related to that part.
"Well, you said it's ok to use it. After I replaced the part, the unit doesn't work. You fix it."
Edits: 11/07/16
> Almost all manufacturers or techs on all levels, will step away from saying a replacement product is ok --- if it doesn't meet exact same OEM standards.
Exactly: the point is that the 5814 along with the 6201 are standard 12AU7 types and never should have been excluded from use in the product to begin with.
The 6201 is not a standard 12AU7 type. It is the "industrial" version of the 12AT7.
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