[JKDJedi]

But is at least nominally informed that they last 10,000 hours? Since it is a miliary tube?

The 5692? Yes, because of the special military build. They're rated at 10,000 hours. And can withstand high number of G Force.

 

[Slade01]

But is at least nominally informed that they last 10,000 hours? Since it is a miliary tube?

Alot of military tube designations are identical in construction to the consumer versions. The differences in those lie in the testing and quality control (military required more rigorous / strict testing specs). Like @JKDJedi said - the 5692 is probably one of the only types that were specifically made for military and has that construction for rugged use.

 

[JKDJedi]

 

[SHIMACM]

No, no. The question is related to the TS 5998. Is it a tube that the manufacturer says is 10,000 hours old? Regardless if it is true in practice.

 

[JKDJedi]

No, no. The question is related to the TS 5998. Is it a tube that the manufacturer says is 10,000 hours old? Regardless if it is true in practice.

I've never heard of any such claims for the 5998 as a 10,000 hour tube. It'd be nice if all the tubes lasted 10,000 hours. Now I'm wondering what the natural life span is..hold on, gonna do a quick Google..

Their lifespan is determined by the type of power amp circuit they are utilised in—the power rating and circuit topology (push-pull or single-ended)—but somewhere between 1000 to 2000 hours is a reasonable estimate. N.O.S. power tubes are shorter-lived than preamp tubes and they're physically larger.


Google has spoken.

 

[JKDJedi]

Gonna have some fun comparing these two Bad Boys. The getter flash on the Motorola is impressive.

 

[bcowen]

Just as an aside....why do some tube sellers write directly on the tubes with a sharpie??? This kills me.

Sharpie ink wipes off very easily with some alcohol. Unless of course they're written over the manufacturers silkscreen, which would then likely come off with the Sharpie ink. THAT would kill me. Probably like instantly. What I hate is when they use those cheap little paper stickers that shred into little pieces and leave sticky gunk all over when you try and pull them off. Even alcohol is almost useless (especially on the adhesive on Russian stickers) , and it's time for the Goo Gone....which then has to be cleaned off itself. Arrrggghhh. First world problems, I suppose.

 

[JKDJedi]

Sharpie ink wipes off very easily with some alcohol. Unless of course they're written over the manufacturers silkscreen, which would then likely come off with the Sharpie ink. THAT would kill me. Probably like instantly. What I hate is when they use those cheap little paper stickers that shred into little pieces and leave sticky gunk all over when you try and pull them off. Even alcohol is almost useless (especially on the adhesive on Russian stickers) , and it's time for the Goo Gone....which then has to be cleaned off itself. Arrrggghhh. First world problems, I suppose.

Blame it on the alcohol...

 

[bcowen]

Blame it on the alcohol...

But alcohol is usually the solution...to most things.

 

[Slade01]

Sharpie ink wipes off very easily with some alcohol. Unless of course they're written over the manufacturers silkscreen, which would then likely come off with the Sharpie ink. THAT would kill me. Probably like instantly. What I hate is when they use those cheap little paper stickers that shred into little pieces and leave sticky gunk all over when you try and pull them off. Even alcohol is almost useless (especially on the adhesive on Russian stickers) , and it's time for the Goo Gone....which then has to be cleaned off itself. Arrrggghhh. First world problems, I suppose.

Thankfully not on any silk screen. Will try the alcohol. Because i do not want to be reminded that the tube tested 106/100 each and every time i have to look down at it. Maybe if he wrote it in some fancy cool calligraphy it wouldnt be as bad.

Oh and hell yes the annoying paper stickers are a pain in the a** when it leaves that residue.

 

[JKDJedi]

Thankfully not on any silk screen. Will try the alcohol. Because i do not want to be reminded that the tube tested 106/100 each and every time i have to look down at it. Maybe if he wrote it in some fancy cool calligraphy it wouldnt be as bad.

Oh and hell yes the annoying paper stickers are a pain in the a** when it leaves that residue.

That should come easy with alcohol (hope so). And wow... everything is spotless on your setup. Which tubes are those?

 

[Slade01]

But alcohol is usually the solution...to most things.

Amen to that.

 

[Slade01]

That should come easy with alcohol (hope so). And wow... everything is spotless on your setup. Which tubes are those?

This one was a bargain basement find a Sonora 6SN7GT (really a National Union Black Glass (Code 247), I'm guessing 1951 with the date code (51-5). I've paired it initially with a Winged C power tube to help with the soundstage and brightness. The tube itself is already warm, good mid bass, so just trying to tame it a touch, though its a bit micro-phonic still so i'm leaving it to burn in a bit for now. You know, me and my basement finds...this one was a 10 dollar tube.

 

[JKDJedi]

This one was a bargain basement find a Sonora 6SN7GT (really a National Union Black Glass (Code 247), I'm guessing 1951 with the date code (51-5). I've paired it initially with a Winged C power tube to help with the soundstage and brightness. The tube itself is already warm, good mid bass, so just trying to tame it a touch, though its a bit micro-phonic still so i'm leaving it to burn in a bit for now. You know, me and my basement finds...this one was a 10 dollar tube.

I like the National Unions as much as I like the Sylvanias, got that tube vibe I like going for them. Not over clinical, just enough details in the mids, everything else is just bliss. .

 

[cddc]

Thankfully not on any silk screen. Will try the alcohol. Because i do not want to be reminded that the tube tested 106/100 each and every time i have to look down at it. Maybe if he wrote it in some fancy cool calligraphy it wouldnt be as bad.

Oh and hell yes the annoying paper stickers are a pain in the a** when it leaves that residue.

I actually like the sharpie a lot. First of all it gives you an idea how the tube tests. I don't like tubes that come with no measurements. Secondly, it can be removed by alcohol with easy. I always clean incoming tubes with iso alcohol, especially on the pins. So after I clean the pins with alcohol, I sometimes remove the sharpie marks. But in most cases I just leave the measurements there, they normally do not bother me, unless someone's writing is really ugly...LOL

As long as the sharpie doesn't cover any of the vulnerable silkscreen, I'm just fine.