About New Production Tubes

Mosquito · 16th February 2010, 02:25 PM

Hi everyone!.
I need some advice, Among new production double triodes, wich brand are generally best considered? I'm talking those high rp , 12.6V filament ones.
I know about the JJ 12AT7 for example, other models of this brand are equally good?
Thanks for your opinions/experience

kevinkr · 16th February 2010, 05:25 PM

Their 12AX7A is ok..

New Sensor Electronics makes and sells tube under EH, Sovtek, Mullard, Tungsol brands for some common types. They are all ok.

I prefer NOS industrial in many cases, for example 6021 subs for 12AT7A, 5814 for 12AU7A and are somewhat available on eBay.. 5751 is commonly substituted for the 12AX7A but is not an exact match, mu is 70 as opposed to 100 for the 12AX7A..

radiostar · 16th February 2010, 05:50 PM

If you have an opportunity to find any NOS source for reasonable prices, that should be your 1st choice!!!

Mosquito · 16th February 2010, 05:51 PM

Many thanks! It happens that two 12BZ7's , one 12AU7 and one 50C5 NOS in faulty condition, makes me to consider seriously only new production samples, unless you are prepared to spend serious money, and I'm not. For my application I think it is preferable some high rp but medium mu type. A triode strapped signal pentode?

Cassiel · 09:55 PM

Quote:

It happens that two 12BZ7's , one 12AU7 and one 50C5 NOS in faulty condition

Wow that's really bad luck, maybe someone is selling you defective tubes.
Personally I've only had a problem with a NOS 45, one filament was too close to the grid causing a small red plate area.

Mosquito · 16th February 2010, 10:08 PM

QUOTE=stalker;2087871]Wow that's really back luck, .[/QUOTE]
Maybe, or maybe when you pick those oldies, you need to buy a bunch, not jut a couple of two, and then select. (or pay a wagon of money for the selected-guaranteed- balanced -matched and the like) Anycase I would like to try the sound quality of the new ones, who knows...

Eli Duttman · 17th February 2010, 12:14 AM

Mosquito,

You said current production, medium μ, and high R_P. The EH 12AY7/6072 is a perfect match. The 12AY7 is much like a 12AX7, except it's μ is in the 40s.

BTW, the Sovtek 12AX7LPS (a genuine 7025 equivalent) is more than a match for most of the remaining NOS. This variant is a good tube that would have passed muster in the days of yore.

DigitalJunkie · 17th February 2010, 01:39 AM

I've been in love with the 12AX7LPS since it first came out and I got a couple pairs for my PP6V6 amp. Pretty good sounding tube,low noise/hum,and a reasonable price to boot.

Mosquito · 17th February 2010, 09:05 AM

Eli and DJ
Thanks a lot guys! I'm going to pick some samples right now!

16th February 2010, 02:25 PM	#1
Mosquito diyAudio Member Join Date: Sep 2009 Location: Santa Fe, Argentina	About New Production Tubes Hi everyone!. I need some advice, Among new production double triodes, wich brand are generally best considered? I'm talking those high rp , 12.6V filament ones. I know about the JJ 12AT7 for example, other models of this brand are equally good? Thanks for your opinions/experience __________________ I know how to walk over grapes

16th February 2010, 05:25 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Their 12AX7A is ok.. New Sensor Electronics makes and sells tube under EH, Sovtek, Mullard, Tungsol brands for some common types. They are all ok. I prefer NOS industrial in many cases, for example 6021 subs for 12AT7A, 5814 for 12AU7A and are somewhat available on eBay.. 5751 is commonly substituted for the 12AX7A but is not an exact match, mu is 70 as opposed to 100 for the 12AX7A.. __________________ www.kta-hifi.net

16th February 2010, 05:50 PM	#3
radiostar diyAudio Member Join Date: Apr 2009	If you have an opportunity to find any NOS source for reasonable prices, that should be your 1st choice!!! __________________ tubes.rs facebook.com/tubes.rs

16th February 2010, 05:51 PM	#4
Mosquito diyAudio Member Join Date: Sep 2009 Location: Santa Fe, Argentina	Many thanks! It happens that two 12BZ7's , one 12AU7 and one 50C5 NOS in faulty condition, makes me to consider seriously only new production samples, unless you are prepared to spend serious money, and I'm not. For my application I think it is preferable some high rp but medium mu type. A triode strapped signal pentode? __________________ I know how to walk over grapes

16th February 2010, 10:08 PM	#6
Mosquito diyAudio Member Join Date: Sep 2009 Location: Santa Fe, Argentina	QUOTE=stalker;2087871]Wow that's really back luck, .[/QUOTE] Maybe, or maybe when you pick those oldies, you need to buy a bunch, not jut a couple of two, and then select. (or pay a wagon of money for the selected-guaranteed- balanced -matched and the like) Anycase I would like to try the sound quality of the new ones, who knows... __________________ I know how to walk over grapes

17th February 2010, 12:14 AM	#7
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Mosquito, You said current production, medium μ, and high R_P. The EH 12AY7/6072 is a perfect match. The 12AY7 is much like a 12AX7, except it's μ is in the 40s. BTW, the Sovtek 12AX7LPS (a genuine 7025 equivalent) is more than a match for most of the remaining NOS. This variant is a good tube that would have passed muster in the days of yore. __________________ Eli D.

17th February 2010, 01:39 AM	#8
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	I've been in love with the 12AX7LPS since it first came out and I got a couple pairs for my PP6V6 amp. Pretty good sounding tube,low noise/hum,and a reasonable price to boot.

17th February 2010, 09:05 AM	#9
Mosquito diyAudio Member Join Date: Sep 2009 Location: Santa Fe, Argentina	Eli and DJ Thanks a lot guys! I'm going to pick some samples right now! __________________ I know how to walk over grapes

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