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PostPosted: Thu Apr 14, 2016 4:49 am 
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Location: scarborough, ON, CA
I have a jolida jd9 phono pre.
I find the sound to be quite bright
it currently has 2- electro harmonix 12ax7 tubes
Also, does anyone have a link to a site that describes different tubes and the tonal affect the impart?
Thanks


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PostPosted: Thu Apr 14, 2016 5:01 am 
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Location: Waterloo, ON, CA
Try Brent Jessie's site, he does a high level description of the sound qualities of different brands of the same tube:

http://www.audiotubes.com/12ax7.htm
Todd

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PostPosted: Thu Apr 14, 2016 5:08 am 
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I'm not familiar with that pre, but I've found Mullard and Amperex/Philips 12AX7's to be pretty smooth. Don't get sucked into buying the highest priced versions, just buy what you can afford and find out for yourself. Sometimes you need a pretty revealing system to hear the differences in various versions of these tubes, but overall they all sound good.

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PostPosted: Thu Apr 14, 2016 5:09 am 
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You could check out http://www.thetubestore.com

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PostPosted: Thu Apr 14, 2016 5:28 am 
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When I had a tube integrated amp I had read many many forums about 12AX7 tubes. For phono stage duty the greatest emphasis should be placed on the lowest noise and microphonics rating, and for this the best tube was the Sovtek LPS.

In the wrong system EH tubes can sound bright. For a fat tone, look at JJ.

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PostPosted: Thu Apr 14, 2016 6:18 am 
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Location: Kingston, ON, CA
Here are a few links:

http://www.worldtubecompany.com/mm5/merchant.mvc?Screen=TF-2
https://www.tubesandmore.com/tech_corner/12ax7_comparison_of_current_made_tubes
http://www.tubesforamps.com/best-12ax7-review
http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html - kind of dated now, but still informative

You might also want to look at the 5751 tubes. They have a lower mu, which only means you have to crank up the pot a bit more than with a 12AX7. They aren't as 'sexy' as the 12AX7's, so are more reasonably priced. And they sound very nice in a phono preamp.

Good luck!

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PostPosted: Thu Apr 14, 2016 8:14 am 
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Location: Bowmanville, ON, CA
I've tried many different 12ax7's and always go back to 50's-60's era Tungsram tubes. Very balanced tube top to bottom and throw a very nice 3D soundstage. If brightness is a issue go for Mullards. Cheers


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PostPosted: Thu Apr 14, 2016 8:51 am 
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Location: Toronto, ON, CA
EH 12ax7 and Sovtec 12ax7lps are low noise but dry (lacking "bloom") and bright in my opinion. If you are just starting out in tube rolling I would look for old stock U.S. made tubes from the 50s or 60s like RCA, Sylvania, Raytheon or GE. Best of the bunch would be Black plate RCAs or Raytheon long plates, but any of them will beat low cost new production IMO. 5751 by the same noted companies are also very good, but 5751 may not be right in a phono preamp designed for 12ax7. Check with Jolinda or try it to see. 5751 do not lower gain much (they are a lower mu tube which is not the same as gain).
I have heard good things about some of the premium Chinese and Russian tubes (Psvanes, Treasures, Gold Lions) but have not tried them as they cost like NOS so why bother?
I would avoid the big name European tubes like Telefunken, Amperex and Mullard at least to begin with unless a great deal falls into your lap. They are good, but not worth the premium over the best American tubes. I would take a good RCA long black plate 12ax7 over any of them.
More than likely, you are going to have to try a few different types to find the sound you are looking for.
Enjoy the roll!


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PostPosted: Thu Apr 14, 2016 9:08 am 
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Location: St.Catharines, ON, CA
12at7,12au7 also if you need less gain Paul.

G


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PostPosted: Thu Apr 14, 2016 9:12 am 
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Location: St Catharines, ON, CA
For new production tubes I like he Psvane treasures followed closely by the Gold Lions.
Aaron


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PostPosted: Thu Apr 14, 2016 11:17 am 
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The tube section of the forum must be where all the cool cats hang out

Todd, Nordicnorm and chipmunk, thank you for the links. They were full of easy to understand info, lots of info.
Gary, I know where you are coming from, thank you.


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PostPosted: Thu Apr 14, 2016 12:03 pm 
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Darn - too bad you're in the GTA. If you were in the YEG you could come by the shop and try out all sorts of 12AX7s by the dozens - because that's what's sitting here.
In all seriousness though, tube rolling will end up being a very personal thing. What suits your ears may not suit another pair of ears.
We have one guy who achieves a massive tumescence every time the phrase "smooth plate Telefunken' is spoken within earshot - and another guy who believes that same tube should occupy a place next to his ex-wife in some deep level of Hades.

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PostPosted: Thu Apr 14, 2016 1:20 pm 
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Location: Kelowna, BC, CA
For sure check out Dans ads, he is user dan001. I have bought from Dan several times, great guy and all his tubes are as advertised.

You can get rid of that brightness with Valvo, maybe Amperex too. New tubes just do not compare to quality NOS tubes. Telefunken are very clean sounding, bit lean towards sharper highs which might accentuate the problem. Might....

Valvo are smooth and rich, but retain dynamics too.

GE military spec 12ax7 are very good, and also GE canadian 12ax7.

Ping Dan, he can give good advice. I have not looked, but chances are he has some good ax7 for sale.


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PostPosted: Thu Apr 14, 2016 2:08 pm 
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Location: Stratford, ON, CA
Hi,

NOS RCA-Japan 12AX7s are affordable and sound fine. But that Jolida pre may be 'just bright'. I had a Jolida tube integrated for a while and I could never get it off a 'bright tilt upward' despite rolling through about five brands of EL-84s.

Cheers,
David Neice

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PostPosted: Thu Apr 14, 2016 2:42 pm 
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scarbpaul12 wrote:
The tube section of the forum must be where all the cool cats hang out

Todd, Nordicnorm and chipmunk, thank you for the links. They were full of easy to understand info, lots of info.
Gary, I know where you are coming from, thank you.

You're most welcome.
When you find the sound you're listening for you'll know it!
Cheers... :D

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