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6SN7 Tube Addicts - Page 107

post #1591 of 2233
2/1/12 at 11:27pm
Thread Starter 

The 5692 and the 1578 were designee for heavy duty with a 10,000hrs life span.

However if they are used in a 6SN7 circuit their life is reduced because of the different operating conditions.

 

I agree with Blackmore's statement about getting high quality (not necessarily price) tubes.

 

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post #1592 of 2233
2/2/12 at 4:30am
Quote:
Originally Posted by rosgr63 View Post

The 5692 and the 1578 were designee for heavy duty with a 10,000hrs life span.

However if they are used in a 6SN7 circuit their life is reduced because of the different operating conditions.

 

I agree with Blackmore's statement about getting high quality (not necessarily price) tubes.

 


What is the difference between the 6SN7 operating condition and the condition that a 5692 was designed for?

 

 

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post #1593 of 2233
2/2/12 at 10:31am
Thread Starter 
Quote:
Originally Posted by dminches View Post


What is the difference between the 6SN7 operating condition and the condition that a 5692 was designed for?

 

 

The 6SN7 Reference thread states:

 

http://www.head-fi.org/t/117677/the-reference-6sn7-thread

 

QUOTE
 

Fact 2: The widely advertised of ‘10000 hrs life’ for the 5692 is just advertising baloney. If one would observe carefully, the 5692’s specs differ quite greatly from the 6SN7s – far lower plate voltage and max dissipation rates are given. It can be inferred that this conservatism in its ratings contributes directly to the 5692’s purported long life. Hence, if you intend to use the 5692 as a drop-in for a 6SN7 in an amp running 6SN7 voltages and currents, be prepared to have your 5692 last no longer than a normal 6SN7 at best.

 


UNQUOTE

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post #1594 of 2233
2/2/12 at 1:17pm

Stavros, thanks for the info.

 

A pair of metal base Sylvania 6SN7Ws sold for $345 on ebay.  Crazy.

 

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post #1595 of 2233
2/2/12 at 4:55pm

I thought that was about the going rate for the metal base Sylvanias actually.  They've been at star status amongst 6SN7 for longer than just about any other tube has.

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post #1596 of 2233
2/2/12 at 4:57pm

The last pair I purchased was a year ago and I paid $275.  I guess $345 isn't crazy, but it sure indicates the rising cost of NOS tubes.

 

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post #1597 of 2233
2/2/12 at 6:26pm
Quote:
Originally Posted by rosgr63 View Post

The 6SN7 Reference thread states:

 

http://www.head-fi.org/t/117677/the-reference-6sn7-thread

 

QUOTE
 

Fact 2: The widely advertised of ‘10000 hrs life’ for the 5692 is just advertising baloney. If one would observe carefully, the 5692’s specs differ quite greatly from the 6SN7s – far lower plate voltage and max dissipation rates are given. It can be inferred that this conservatism in its ratings contributes directly to the 5692’s purported long life. Hence, if you intend to use the 5692 as a drop-in for a 6SN7 in an amp running 6SN7 voltages and currents, be prepared to have your 5692 last no longer than a normal 6SN7 at best.

 


UNQUOTE


Cool thanks. That said, I've typically found the 5692s quieter and have never suffered from microphonics. Something the standard 6SN7s that I've owned couldn't match IME.

 

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post #1598 of 2233
2/2/12 at 7:58pm
Quote:
Originally Posted by MacedonianHero View Post


Cool thanks. That said, I've typically found the 5692s quieter and have never suffered from microphonics. Something the standard 6SN7s that I've owned couldn't match IME.

 



I agree that the 5692 is a very quiet tube and that is important for me with my sensitive Beyerdynamic T70 headphones.

 

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post #1599 of 2233
2/2/12 at 7:59pm
Quote:
Originally Posted by john57 View Post



I agree that the 5692 is a very quiet tube and that is important for me with my sensitive Beyerdynamic T70 headphones.

 



Or my Grado HF-2s or Ed.8s. smile.gif

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post #1600 of 2233
2/3/12 at 1:35am
Thread Starter 
Quote:
Originally Posted by Xcalibur255 View Post

I thought that was about the going rate for the metal base Sylvanias actually.  They've been at star status amongst 6SN7 for longer than just about any other tube has.


I agree, this has been the going rate of a NIB pair for the last 2-3 years.

They are not cheap for sure.

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post #1601 of 2233
2/3/12 at 7:48pm

Does anyone like the sound of Sylvania tall bottle ?

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post #1602 of 2233
2/3/12 at 7:52pm
Quote:
Originally Posted by Audio-Omega View Post

Does anyone like the sound of Sylvania tall bottle ?


I like the Sylvania VT-231 (tall bottle) quite a bit and its likely one of the most neutral 6SN7 or variant I've heard.

 

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post #1603 of 2233
2/3/12 at 7:56pm
Quote:
Originally Posted by Audio-Omega View Post

Does anyone like the sound of Sylvania tall bottle ?


May have a pair. Let's open up the wooden box for a late look and listen, shall we? Of course, I couldn't afford the VT-231 version. But will check anyway...

popcorn.gif

 


Edited by Silent One - 2/3/12 at 7:58pm
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post #1604 of 2233
2/3/12 at 8:03pm

Is there a sound difference between VT-231 and no VT-231 tubes ?

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post #1605 of 2233
2/3/12 at 8:05pm


 

Quote:
Originally Posted by Audio-Omega View Post

Is there a sound difference between VT-231 and no VT-231 tubes ?



On the RCAs, definitely yes.

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