NOS versus new production tubes

A sub forum for our most useful repair, maintenence & upgrade threads.
User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Tue Feb 01, 2011 1:35 am

my first NOS tube arrived!!!

...it's a GE 5Y3...I've bought a variety of used stuff on ebay (so I can figure out what I like), and they have started arriving... :)

Image

Image

Image

Image

Image

hopefully the rest of the first lot will arrive within the next 10 days or so, so I can stick them in my Tweed Deluxe


more updates coming soon (more GE and RCA stuff!) :)
Resident Spartan.

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Wed Feb 02, 2011 3:18 am

another day, another NOS tube!

today a GE 12AX7 arrived :)

Image

Image

Image

Image

more to come... :freako:
Resident Spartan.

User avatar
øøøøøøø
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 8281
Joined: Sun Jan 06, 2008 8:26 pm
Location: Brooklyn, NY
Contact:

Re: NOS versus new production tubes

Post by øøøøøøø » Wed Feb 02, 2011 6:28 am

good, good. :)

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Wed Feb 02, 2011 6:44 am

got some RCA 6V6s on the way too! :)
Resident Spartan.

User avatar
sookwinder
Mods
Mods
Posts: 10397
Joined: Mon Sep 11, 2006 6:47 pm
Location: Melbourne Australia

Re: NOS versus new production tubes

Post by sookwinder » Wed Feb 02, 2011 3:17 pm

Hey Brad, I suspoect you and I unintentionally have helped turn Yannis into a NOS valve ....

Image
relaxing alternative to doing actual work ...

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Wed Feb 02, 2011 3:39 pm

my woman has ALREADY left me...

:freako: :freako: :freako:
Resident Spartan.

User avatar
Stratelejazzuar
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 6707
Joined: Sun Jul 22, 2007 10:15 pm
Location: K-W, Ontario, Canada

Re: NOS versus new production tubes

Post by Stratelejazzuar » Wed Feb 02, 2011 5:41 pm

øøøøøøø wrote:good, good. :)
haha, you just made me think:

Image

;D

You guys and your NOS tube pr0n is giving me major GAS, too, btw :ph34r:

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Mon Feb 07, 2011 1:30 am

some more just arrived...RCA 6V6GTAs... :)

Image

Image

Image

there will be more this week, and then the experimenting will begin! 8)
Resident Spartan.

User avatar
Jaguar018
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 6980
Joined: Thu Nov 06, 2008 6:48 am
Location: Burbs of Washington DC

Re: NOS versus new production tubes

Post by Jaguar018 » Tue Feb 08, 2011 10:40 am

I'd be willing to take your zhivago seconds... ;)

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Tue Feb 08, 2011 12:23 pm

Jaguar018 wrote:I'd be willing to take your zhivago seconds... ;)

I'll see what happens after the shootout, and let everyone know how the spares will roll :)
Resident Spartan.

User avatar
Jaguar018
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 6980
Joined: Thu Nov 06, 2008 6:48 am
Location: Burbs of Washington DC

Re: NOS versus new production tubes

Post by Jaguar018 » Wed Feb 09, 2011 6:31 am

zhivago wrote:I'll see what happens after the shootout, and let everyone know how the spares will roll :)
Cool. Whenever I read stuff on tube comparisons, there tend to be stand outs. Often second or third place is almost as good, or just has a different element to the sound that the tester person subjectively does not enjoy as much as the #1.

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Wed Feb 09, 2011 6:48 am

very true! :)

this arrived today...

Image

Image

Image

Image


....and more to come in the next few days... 8)
Resident Spartan.

User avatar
NoiseAnnoys
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 213
Joined: Tue Jan 05, 2010 1:33 pm

Re: NOS versus new production tubes

Post by NoiseAnnoys » Wed Feb 09, 2011 10:41 am

I didn't really buy into the NOS hype until I picked up an old Harmony amp that had the original RCA 6V6's in it. They really do sound amazing. I'm going to have to buy a stash while prices are still reasonable. Yannis, I'm curious to see which ones are your favorites.

I still use JJ's though for things like my Vox AC50, because it just chews up tubes as is and I'd hate to spend the coin on NOS EL34s to keep it going. Plus, I feel this weird kind of ethnic duty to them for having a plant in Slovakia. :D In the end, I suppose I could get NOS for them, but the AC50 was my road amp (and hopefully will be going on tour in the next few years) and I hated the thought of carrying $300+ worth of tubes around as replacements in case something went wrong.

User avatar
zhivago
Mods
Mods
Posts: 20397
Joined: Tue Sep 12, 2006 6:18 am
Location: London, UK

Re: NOS versus new production tubes

Post by zhivago » Sat Feb 12, 2011 6:58 am

I found this explanation of tube name/designation aliases online on another forum, that I thought we could have here too...
12AX7 numbered variants:

7025 - spiral wound filaments for reduced hum. Most 12AX7s after the mid 50s will have this as a standard feature.

6681 - mobile-rated 12AX7. Filaments perform well with a wider range of voltages.

6057 - Brimar's special quality 12AX7.

7729 - CBS/Raytheon's instrumentation grade 12AX7, with heavily gold plated pins.

CV492, CV4004, M8137 - British Military designators. Typically Mullard or Brimar.

B339 - Another British equivalent, most of these are regular Mullard ECC83s branded Marconi or MWT.

B759 - The Genalex "custom" 12AX7, a selected, tested Mullard ECC83.


12AU7: 5814, 5963, 6067, 6189, 6680, 7316, 7730, CV491, CV4003, M8136, B329, B749

12AT7: 6060, 6201, 7728, CV455, CV4024, M8162, B309, B739

12AY7: 6072
Resident Spartan.

User avatar
NoiseAnnoys
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 213
Joined: Tue Jan 05, 2010 1:33 pm

Re: NOS versus new production tubes

Post by NoiseAnnoys » Wed Feb 16, 2011 8:38 am

I'm going to bump this for a question, primarily directed at Theta or anyone else who knows a bunch about this subject:

So, I have this vintage Vox AC50, right? And it positively chews up EL34s, even biased a little cooler than AC50s typically are. Approximately how much more life could I expect out of a set of NOS EL34s (or any other equivalent) since the amp is running so hot? I've been using JJ's, but if I'm going gain a lot more performance out of it, I might as well consider switching and laying in a stock of NOS while I can.

Post Reply