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post #31 of 88
Thread Starter 
Quote:
Originally Posted by Tjj226 Angel View Post

Quote:
Originally Posted by coolhandluke41 View Post

nice post ,I just realized that we both use same type of tubes (12au7) so if you end up getting a pair and want to get rid of the second tube, please let me know I might be interested ,the [RCA NOS/NIB JRC-6189/12au7WA/ECC82 Black plates tube Triple Mica] looks interesting ,as for Telefunken..last night I was browsing ebay and try to find reasonably priced TELEFUNKEN ECC802S and failed again ,they just outrageously priced so end up getting copy (NOS Tesla ECC802S)
http://www.ebay.com/itm/171253161671?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

P.S. headband looks like a nice fit ,I'm very interested in modding 400's as well ,please keep us updated on your findings ,especially "re grilling mod" thumb.gif

I have to find this pads
http://www.head-fi.org/t/689557/toys-for-boys/15#post_10314750

Somewhere deep in the Aune T1 thread on head -fi, someone CLAIMED that they modded the T1 to accept a telefunken 12ax7.

IDK if this can be done or not, but it may be worth a look.

don't have to look far..._> OP of this thread
    
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post #32 of 88
Then just buy the telefunken 12ax7 smooth plate. You can get a single tube for like 50 bucks.
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post #33 of 88
Thread Starter 
first of all I have a lot of tubes for Aune T1 -more then I need ,second -don't have the socket and don't plan on getting one since it's a custom made (sockets/adapters are not all that great and most of the time they don't work properly )
as for adapters ;
Quote:
Sad to say that's one of the 2 adapters I bought that had noise issues (in fact, it was the worse of the two by a huge margin). It was also among the 4 adam bought that all had noise issues. Hope you win the adapter lottery like punit reportedly did - if indeed, the adapter is even the real issue. As you guys may have noted, PB has posted several times, here and on the BH boards, that modding the circuit and using a separate wall wart to provide DC to the 6sn7 heaters is the recommended way to run that tube type quietly.

I have far more 12au7's and 12bh7's than 6sn7's and ultimately decided to abandon this fool's errand and to leave my amp as is. Trace levels of bitterness remain.

there is plenty very good none 12A..tubes and they are very reasonably priced,hopefully one out of two adapters I ordered will work if not I'm only one or two 12AU7 tubes away from being satisfied when it comes to Crack
Edited by coolhandluke41 - 3/1/14 at 9:31am
    
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post #34 of 88
Quote:
Originally Posted by coolhandluke41 View Post

7308's are pretty hard to find this days ,I'm actually looking for one since it works the best for my Aune/Darkvoice tube combination (I like to have Amperex in Aune since it gives fat bass and great soundstage
P.S. any picks ?
if it's NOS ,it will take sometime for the tube to burn-in ,great choice enjoy thumb.gif

What's the best way to burn in an NOS tube and how long does it take? Can you just leave the tube powered up or do you need some white/pink noise?

I'm wondering when my NOS 7308 is going to break in. The Gold Lion I just got sounds incredible out of the box.
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post #35 of 88
Thread Starter 
it all depends from a particular tube ,some Russian tubes take the longest -it shouldn't be more then 100 hours (in ref. to one of the tube sellers),there are few methods- pink ,jazz ,etc
Edited by coolhandluke41 - 3/4/14 at 6:36pm
    
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post #36 of 88
Quote:
Originally Posted by coolhandluke41 View Post

it all depends from a particular tube ,some Russian tubes take the longest -it shouldn't be more then 100 hours (in ref. to one of the tube sellers),there are few methods- pink ,jazz ,etc

Please explain how tubes burn in exactly?

Tubes either work, or they don't work. If tubes have to burn in, then WWII would have been VERRRRRY different.
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post #37 of 88
Thread Starter 
Quote:
Originally Posted by Tjj226 Angel View Post

Quote:
Originally Posted by coolhandluke41 View Post

it all depends from a particular tube ,some Russian tubes take the longest -it shouldn't be more then 100 hours (in ref. to one of the tube sellers),there are few methods- pink ,jazz ,etc

Please explain how tubes burn in exactly?

Tubes either work, or they don't work. If tubes have to burn in, then WWII would have been VERRRRRY different.

http://lmgtfy.com/?q=valve+tube+burn+in%2Cbreak+in+period

this sweet tube needs almost 300 hours
http://psvanetube.com/wordpress/store/products/cv181-z-pair/



same applies to variety of electronics..I thought you were engineer ?
Edited by coolhandluke41 - 3/5/14 at 10:01am
    
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post #38 of 88
Quote:
Originally Posted by coolhandluke41 View Post

http://lmgtfy.com/?q=valve+tube+burn+in%2Cbreak+in+period

this sweet tube needs almost 300 hours
http://psvanetube.com/wordpress/store/products/cv181-z-pair/



same applies to variety of electronics..I thought you were engineer ?

Here ya go.

http://lmgtfy.com/?q=Why+everything+you+read+on+the+internet+is+not+true

Tubes decay over time, but it is not like you ALWAYS get a better sound. Sometimes you actually get a very bad sound.

If you want tubes to sound their best, then ask the seller if you can offer him a few extra bucks to find tubes that test very strongly on a tube tester and forget about the burn in period.
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post #39 of 88
FWIW I purchased the NOS 7308 from upscaleaudio and they test each tube and are very reputable. Although, I'm a little concerned that the label on the box said it was a JAN NOS 1966 tube, however the markings on the tube indicate it is a USN-CEP 1964 tube.

When first installed in my Aune T1, I immediately noticed that the gain had decreased and there was a slight hiss. I've put about 10 hours on the tube and the hiss has gone away and the gain seems to now be closer to the stock 6922EH tube. So I've definitely noticed a difference. Whether it's due to burn-in or better contact on the pins due to installing/re-installing I don't know. It's going to take a while to get 50+ hours of burn-in time on this tube though.
Edited by rwpritchett - 3/5/14 at 11:43am
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post #40 of 88
Thread Starter 
Quote:
Originally Posted by Tjj226 Angel View Post

Quote:
Originally Posted by coolhandluke41 View Post

http://lmgtfy.com/?q=valve+tube+burn+in%2Cbreak+in+period

this sweet tube needs almost 300 hours
http://psvanetube.com/wordpress/store/products/cv181-z-pair/



same applies to variety of electronics..I thought you were engineer ?

Here ya go.

http://lmgtfy.com/?q=Why+everything+you+read+on+the+internet+is+not+true

Tubes decay over time, but it is not like you ALWAYS get a better sound. Sometimes you actually get a very bad sound.

If you want tubes to sound their best, then ask the seller if you can offer him a few extra bucks to find tubes that test very strongly on a tube tester and forget about the burn in period.

I'm not looking for anything ,was pointing you in the right direction
Quote:
Originally Posted by rwpritchett View Post

FWIW I purchased the NOS 7308 from upscaleaudio and they test each tube and are very reputable. Although, I'm a little concerned that the label on the box said it was a JAN NOS 1966 tube, however the markings on the tube indicate it is a USN-CEP 1964 tube.

When first installed in my Aune T1, I immediately noticed that the gain had decreased and there was a slight hiss. I've put about 10 hours on the tube and the hiss has gone away and the gain seems to now be closer to the stock 6922EH tube. So I've definitely noticed a difference. Whether it's due to burn-in or better contact on the pins due to installing/re-installing I don't know. It's going to take a while to get 50+ hours of burn-in time on this tube though.

this is pretty normal ,some tubes are not as loud as others ,I have Volvo CCa that's very quite (just crank up your gain ) ,that doesn't mean there is something wrong with it ,Upscale is pretty good source since they go extra mile and test their tubes for micro phonics but there is no way to tell from NOS tube if it won't change sound characteristics - this are basically new tubes
P.S. the only tube I own that changed drastically over time was one of the Mullards and "Reflector" both for the better
Edited by coolhandluke41 - 3/5/14 at 12:33pm
    
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