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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 232

post #3466 of 6980
Quote:
Originally Posted by Sony Slave View Post
 

In your or anyone else's experience, what is the best 6AV6 tubes out there in terms of soundstage, treble and detail? 

 

MIKELAP's posting that you quoted from is in regard to 6-volt double triodes, namely 6DJ8 and 6BQ7A / 6BZ7. These are very different than the 6AV6.....

 

Of all the 6AV6 I have heard, the GE, Toshiba, FIVRE and Tung-Sol 6AV6 (and sisters, 6AT6 / 6AQ6) with box getters have the best sound stage, treble and detail. And further, after reading Mordy's observations, I think I can safely say that any 6AV6 with box-getters should be excellent.

post #3467 of 6980

Ok, I'm about to research the GE's a little more.

post #3468 of 6980
Those NEC 6AV6's without the box are not an enjoyable listen IMHO...
post #3469 of 6980

Brimar 6AT6 with box are also better than westinghouse and NEC 6AV6's without box. There seems to be some other structural differences too between with and without the box and that causes different sound.

 

Here is short list of tubes that are better than my 6AV6's without box, imo.

 

Sylvania 6DK6 Made in USA. These seems to have little bass boost.

700

 

 

Fivre 6CB6 Made in Italy. They have made something right in Italy.

700

 

 

Lifetime 6EW6 Made in Japan. This pair looks little different inside, but sound is similar.

700

 

 

Raytheon 6AN5 Made in USA -65. These heart of oaks really beats the crap out of NEC 6AV6's. Easy to use with EF95 mode.

700

 

 

Telefunken 6AM6S. Big box on top must do something to music.

700

post #3470 of 6980

Hi Sony Slave,

 

I have listened carefully to three types of 6AV6 tubes with the box getter; RCA, Tung Sol and Sylvania.

 

It seems to me that the RCAs are excellent, but the Sylvania with a clear top, a little dish on top of the plate, side getter, and box top are even better. Here is a picture:

 

 

Now, burning in the amp itself, burning in headphones, speakers, and burning in tubes, require a signal. In the olden days you could buy CDs with a burn in signal that comprised all frequencies in a sweep. I would just leave the track on repeat, leave the volume on low, close the door and leave it overnight for a few nights.

Another suggestion is to use FM "white noise" which is what you hear between stations.

 

Here is a link to white noise, pink noise and something new to me: brown noise.

http://www.youtube.com/watch?v=L3CiZxstvEA

 

My guess is that most mechanical and electronic things improve after a burn in/use period. Just think of a new car, or a new pair of shoes or a new chair - they all function better after being used!

 

The 6AV6 tubes come into full bloom first after some 50 hours of burn in, and the change is dramatic.

post #3471 of 6980

Today's random tube thought:  It's too bad that tubes are not available locally for those who seek instant gratification.  The wait is killing me ... and, I still haven't ordered any new tubes yet.  :cool:

post #3472 of 6980
Quote:
Originally Posted by mordy View Post
 

Hi Sony Slave,

 

I have listened carefully to three types of 6AV6 tubes with the box getter; RCA, Tung Sol and Sylvania.

 

It seems to me that the RCAs are excellent, but the Sylvania with a clear top, a little dish on top of the plate, side getter, and box top are even better. Here is a picture:

 

 

Now, burning in the amp itself, burning in headphones, speakers, and burning in tubes, require a signal. In the olden days you could buy CDs with a burn in signal that comprised all frequencies in a sweep. I would just leave the track on repeat, leave the volume on low, close the door and leave it overnight for a few nights.

Another suggestion is to use FM "white noise" which is what you hear between stations.

 

Here is a link to white noise, pink noise and something new to me: brown noise.

http://www.youtube.com/watch?v=L3CiZxstvEA

 

My guess is that most mechanical and electronic things improve after a burn in/use period. Just think of a new car, or a new pair of shoes or a new chair - they all function better after being used!

 

The 6AV6 tubes come into full bloom first after some 50 hours of burn in, and the change is dramatic.

I see. I am looking for the ones that you have posted above, but I can not find them.

post #3473 of 6980
Quote:
Originally Posted by Artsi View Post
 

Brimar 6AT6 with box are also better than westinghouse and NEC 6AV6's without box. There seems to be some other structural differences too between with and without the box and that causes different sound.

 

Here is short list of tubes that are better than my 6AV6's without box, imo.

 

Sylvania 6DK6 Made in USA. These seems to have little bass boost.

700

 

 

Fivre 6CB6 Made in Italy. They have made something right in Italy.

700

 

 

Lifetime 6EW6 Made in Japan. This pair looks little different inside, but sound is similar.

700

 

 

Raytheon 6AN5 Made in USA -65. These heart of oaks really beats the crap out of NEC 6AV6's. Easy to use with EF95 mode.

700

 

 

Telefunken 6AM6S. Big box on top must do something to music.

700

Thank you. I take it that the RAYTHEON  are the best of the bunch.

post #3474 of 6980
Quote:
Originally Posted by wje View Post

Today's random tube thought:  It's too bad that tubes are not available locally for those who seek instant gratification.  The wait is killing me ... and, I still haven't ordered any new tubes yet.  cool.gif
No this is a good thing as the local tube merchant would be my crack dealer...
post #3475 of 6980
Quote:
Originally Posted by Artsi View Post
 

Telefunken 6AM6S. Big box on top must do something to music.

700

 

Interestingly, the SFR PM07 markings are still visible. In this case, Telefunken apparently relabeled a French tube.

post #3476 of 6980

I got lucky. After searching through an entire list of ads on the 6AV6, 6ATQ, and finally the 6AQ6 family,  I found what mordy was telling me to look for!

 

I thought I would never find them and I was just about to settle for the Raytheon 6AN5.

 

 

The vendor was only selling two of them as well, are these any good?

post #3477 of 6980
Quote:
Originally Posted by Sony Slave View Post
 

Thank you. I take it that the RAYTHEON  are the best of the bunch.

No, no. Best of those 5 tube models are Sylvania 6DK6, Fivre 6CB6 and Lifetime 6EW6. Old raytheons does not have a change against those, but they still win no-box 6AV6's.

 

Quote:
Originally Posted by Oskari View Post
 

 

Interestingly, the SFR PM07 markings are still visible. In this case, Telefunken apparently relabeled a French tube.

It is not surprise if i like french tubes, i like french cars too (or price of the used cars).

post #3478 of 6980

How do the Sylvania 6DK6  compare to the Sylvania  6AQ6?

post #3479 of 6980
Quote:
Originally Posted by Artsi View Post
 

No, no. Best of those 5 tube models are Sylvania 6DK6, Fivre 6CB6 and Lifetime 6EW6. Old raytheons does not have a chance against those, but they still win no-box 6AV6's.

 

It is not surprise if i like french tubes, i like french cars too (or price of the used cars).

 

I'm thinking that might be why the Ratheon tubes are only commanding about $1.50 each on Ebay at the moment.

post #3480 of 6980

Hi Sony Slave,

 

I can't find them either right now. However, patience pays off. Keep on looking on Ebay, and they will show up.

 

The other thing is that many pictures are not clear, and some tubes only have pictures of the box. The answer is communication. Ask the seller which type it is, and send a picture to show what you are looking for.

 

Good luck!

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