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Aune T1 USB Tube DAC+ SS Amp Discussion Thread ***See first post for FAQ--Updated on 02/14/15*** - Page 227

post #3391 of 8031
Quote:
Originally Posted by MrEleventy View Post

It's in a tube buffer of a dac so I doesn't require as much voltage as an amp would so it won't burn as brightly.

 

I see. 

 

Does this mean that the sound is less dependant on the tube, in the Aune, compared to a tube amp?

 

Maybe I made the right decision by putting the 6922 into the EF1 then.. 

 

:L3000:

post #3392 of 8031

You should not swap the tubes in those circuits.

 

12AU7 is a 12v heater, 6922 is a 6v heater.

post #3393 of 8031
Quote:
Originally Posted by mhamel View Post
 

You should not swap the tubes in those circuits.

 

12AU7 is a 12v heater, 6922 is a 6v heater.

 

Please elaborate? 

 

EDIT: Found this in another thread.

 

 
Originally Posted by Skylab View Post
 
Quote:
Originally Posted by HeadphoneAddict View Post
I could have sworn the 6922 was a 6.3v heater tube, not a 12.6v heater tube. It will work in a Cavalli CTH when switched to the lower voltage, but not the EF1.
You are correct - the 6922 is a 6.3V tube. It's amazing that using it in the EF1 didn't actually damage something. The 6922 is very nearly compatible with the 6DJ8. But it is NOWHERE NEAR compatible with the 12AU7 and SHOULD NOT, EVER, be used in it, or in any application calling for a 12AU7.

Sorry to be so emphatic, but tube rolling requires some care. If you want to check tube compatibility, check here: http://tdsl.duncanamps.com/tubesearch.php If it doesn't say it's a substitute there, you should assume it CANNOT be used. People on EBay will list all kinds of tubes as being "substitutes" for other tubes - and in many cases, they are certainly not. Even things commonly used, like using an ECC32 for a 6SN7 or a 5998 for a 6AS7 are almost always OK, but NOT always, since these really are not direct subs, either. For that matter, a 6922 isn't even exactly the same as a 6DJ8!
 
BRB, swapping tubes back. Funny, I didn't into any issues at ALL. I actually found improvement. Thanks for the heads up!

Edited by White Lotus - 11/25/13 at 3:43pm
post #3394 of 8031
Quote:
Originally Posted by White Lotus View Post
 

 

Please elaborate? 

 

 

Just because they are both 9-pin dual triodes, they are not drop-in replacements for each other.    You risk damaging either the tube or the circuit.

 

Basically, the 6922 is glowing far brighter because you're applying 12v across the heater pins that are designed for 6.3v, which it is not designed to take.


Edited by mhamel - 11/25/13 at 3:47pm
post #3395 of 8031
Quote:
Originally Posted by mhamel View Post
 

 

 

Just because they are both 9-pin dual triodes, they are not drop-in replacements for each other.    You risk damaging either the tube or the circuit.

 

Basically, the 6922 is glowing far brighter because you're applying 12v across the heater pins that are designed for 6.3v, which it is not designed to take.

 

Thanks mate - your advice is very helpful and I appreciate it.

post #3396 of 8031

Sure, you're welcome.   In some circuits, depending on how the heater is wired, it may be possible to sub or wire up an adapter, but without knowing the circuit and testing it out to make sure, it's a risk.

 

Take a look at the tube data sheets online, the 12AU7 has two heater circuits (pins 4/5) with a center tap on pin 9, where the 6922 has a single circuit across 4/5 with a connection to the internal shield on pin 9.

post #3397 of 8031

I've just swapped them back. No audible damage..

 

Phew!

post #3398 of 8031
Lucky you. This hole tube rolling thing is pretty confusing for a starter.
post #3399 of 8031
Quote:
Originally Posted by santacruise View Post

Lucky you. This hole tube rolling thing is pretty confusing for a starter.

 

Best bet to start is to stick with the list of tubes in the FAQ, and known sellers, and don't hesitate to ask lots of questions.    There are a lot of fakes out there of the 6DJ8/ECC88, 6922/E88CC, 7308/E188CC family tubes - they're in high demand and getting more and more scarce/expensive.  

post #3400 of 8031
I won't delete my previous posts - it's good to have my past mistakes clearly posted, so that others can learn from them!

 

Thankfully no gear was damaged. 

 

TL;DR: TUBE ROLLING. BE CAREFUL OUT THERE, KIDS.


Edited by White Lotus - 11/25/13 at 4:41pm
post #3401 of 8031
Quote:
Originally Posted by mhamel View Post

Best bet to start is to stick with the list of tubes in the FAQ, and known sellers, and don't hesitate to ask lots of questions.    There are a lot of fakes out there of the 6DJ8/ECC88, 6922/E88CC, 7308/E188CC family tubes - they're in high demand and getting more and more scarce/expensive.  
I dont understand, there tubes are discontinuted?
post #3402 of 8031
Quote:
Originally Posted by santacruise View Post

I dont understand, there tubes are discontinuted?

Some of the tubes like the 6922 EH are being manufactured, but the Amperex Bugle Boys, OG, Mullards, and many others are either NOS (new old stock) or used tubes from the 50s through the 70s and these are expensive and some have been known to be faked (actually modern tubes, many made in China, with fake vintage markings so that they can sell for high prices). My Amperex 7308 JAN was made in 1969 and was pretty expensive, but it is a great sounding tube. If you use reliable dealers (eg Upscale Audio in the US), you will avoid risk of mismarked tubes.
post #3403 of 8031

 

 

 

 

post #3404 of 8031

Just got my T1 in the mail today, wow this thing sounds AMAZING.  I haven't tried it on anything but my M100's yet, but they really do sound amazing.  I haven't really had many amp's/dac's to compare it to, beside the ELE-1 and C&C BH, but I like what I'm hearing.  This one has a 6922EH in it now, and I have a Rocket 6N23P on the way to try next.  Very cool, glad I got one :)

post #3405 of 8031

Sound like the OG that I bought few weeks back already arrive at requested address..

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