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For 6AS7G tube rollers here .....
Apr 14, 2016 at 5:15 PM Post #3,481 of 9,577
I have a set of 6BX7's coming. Same plate structure "X" as the 6BL7's I have at the moment.
 
I will compare and give my thoughts when they arrive.
I'm looking forward to less gain.
 
Apr 14, 2016 at 7:22 PM Post #3,482 of 9,577
I have an old school SinglePower Extreme that has been updated to eliminate all of the original design issues discussed here a few years back. It has a new power transformer capable of 6.3 volts at 10 amps and has a 25 amp rectifier.
 
Currently I am using a 7N7 with an adapter and two Tungsol 5998's.
 
Do you think that I could replace the 5998's with 6BL7/6BX7's?
 
Apr 14, 2016 at 7:56 PM Post #3,483 of 9,577
mourip said:
  I have an old school SinglePower Extreme that has been updated to eliminate all of the original design issues discussed here a few years back. It has a new power transformer capable of 6.3 volts at 10 amps and has a 25 amp rectifier.
 
Currently I am using a 7N7 with an adapter and two Tungsol 5998's.
 
Do you think that I could replace the 5998's with 6BL7/6BX7's?
Click to expand...

 
Two 6BL7's per output socket, for a total of 4, will draw 6 amps, and one 7N7 draws 0.6 amps, so a 10 amp transformer is more than adequate. And in fact, you could run three 6BL7's per output socket, for a total of 6, and the 7N7 for a total of 9.6 amps. So if you do in fact have 10 amps. you are good to go.
 
Cheers,
 
Apr 15, 2016 at 8:56 PM Post #3,485 of 9,577
I've been listening to a pair of sylvania 6bl7 flat plate just switched to a pair of ge's with the other style plate not sure what it's called, I can't seem to tell much difference in sq in the two. anyone else notice this..
 
Apr 15, 2016 at 9:16 PM Post #3,486 of 9,577
gibosi said:
   
Two 6BL7's per output socket, for a total of 4, will draw 6 amps, and one 7N7 draws 0.6 amps, so a 10 amp transformer is more than adequate. And in fact, you could run three 6BL7's per output socket, for a total of 6, and the 7N7 for a total of 9.6 amps. So if you do in fact have 10 amps. you are good to go.
 
Cheers,
Click to expand...

Thanks. Appreciated!
 
Couple more newbie questions...
 
These are dual triode and pin compatable?
 
Is there a reason I would want to use two to replace one 5998? More power? Lower output impedance? More current capability?
 
Apr 15, 2016 at 10:11 PM Post #3,487 of 9,577
mourip said:
Thanks. Appreciated!

Couple more newbie questions...

These are dual triode and pin compatable?

Is there a reason I would want to use two to replace one 5998? More power? Lower output impedance? More current capability?
Click to expand...

They just sound good.
 
Apr 15, 2016 at 10:11 PM Post #3,488 of 9,577
abvolt said:
I've been listening to a pair of sylvania 6bl7 flat plate just switched to a pair of ge's with the other style plate not sure what it's called, I can't seem to tell much difference in sq in the two. anyone else notice this..
Click to expand...

Not really. Closer match better sound in my experience
 
Apr 15, 2016 at 10:26 PM Post #3,489 of 9,577
abvolt said:
  I've been listening to a pair of sylvania 6bl7 flat plate just switched to a pair of ge's with the other style plate not sure what it's called, I can't seem to tell much difference in sq in the two. anyone else notice this..
Click to expand...

 
I have a pair of Sylvania flat-plates and a later pair of Sylvania X-plates. The major difference I hear is in the mid-range, especially vocals. As another Glenn owner put it, vocals with the flat-plates seem to have a bit of a nasal quality, whereas, vocals with the the later X-plates sound a bit more natural to my ears. But this is pretty subtle, and otherwise, I think they sound very similar....
 
Apr 15, 2016 at 10:32 PM Post #3,490 of 9,577
mourip said:
  Thanks. Appreciated!
 
Couple more newbie questions...
 
These are dual triode and pin compatable?
 
Is there a reason I would want to use two to replace one 5998? More power? Lower output impedance? More current capability?
Click to expand...

 
Yes, the 6BL7 is pin compatible with the 5998, 6AS7 and 6SN7...
 
The major difference between the 6BL7 and 5998, when used as a power tube, is current. It takes two to three 6BL7s to effectively move as much current as one 5998. Thus, most folks find that one 6BL7 just doesn't have the same bass power and drive as a 5998. Two do a much better job. And if your amp can handle it, three are even better.
 
Apr 16, 2016 at 1:45 AM Post #3,492 of 9,577
Apr 16, 2016 at 2:05 AM Post #3,493 of 9,577
abvolt said:
I've been listening to a pair of sylvania 6bl7 flat plate just switched to a pair of ge's with the other style plate not sure what it's called, I can't seem to tell much difference in sq in the two. anyone else notice this..
Click to expand...


I just recieved a set of flat plates today. They will go in my amp in the next few days.
 
Apr 16, 2016 at 8:34 AM Post #3,494 of 9,577
thecrow said:
So how do these compare to the Gec 6as7g (and tung sol 5998)?
Click to expand...

 
It is very hard for me to compare these as generally, the 6AS7 has a very different sonic signature than a 6BL7. And what makes it even more difficult is GEC and Chatham did not manufacture the 6BL7, so we can't make that comparison. And further, I am most familiar with Sylvania 6BL7 and unfortunately, to the best of my knowledge, Sylvania did not manufacture the 6AS7. 
 
However, there is a very well-written and informative review in Tweak-Fi of a six 6BL7 Glenn OTL that does a pretty good job of describing the essential sonic differences between the 6AS7 and 6BL7.
 
http://www.tweak-fi.com/apps/blog/show/42754587-building-a-reference-system-part-2-glenn-s-headphone-amplifier
 
Apr 16, 2016 at 8:44 AM Post #3,495 of 9,577
gibosi said:
 
thecrow said:
So how do these compare to the Gec 6as7g (and tung sol 5998)?
Click to expand...

 
It is very hard for me to compare these as generally, the 6AS7 has a very different sonic signature than a 6BL7. And what makes it even more difficult is GEC and Chatham did not manufacture the 6BL7, so we can't make that comparison. And further, I am most familiar with Sylvania 6BL7 and unfortunately, to the best of my knowledge, Sylvania did not manufacture the 6AS7. 
 
However, there is a very well-written and informative review in Tweak-Fi of a six 6BL7 Glenn OTL that does a pretty good job of describing the essential sonic differences between the 6AS7 and 6BL7.
 
http://www.tweak-fi.com/apps/blog/show/42754587-building-a-reference-system-part-2-glenn-s-headphone-amplifier
Click to expand...

I have tried four Chatham 6AS7 tubes.....I sit here wondering what four 5998 would sound like....I have four to try.......have you tried that, gibosi ?
 
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