[Old Deaf Donkey]

I haven't tried any of the ST bottle ones. These are the ones I'm liking right now:

Thanks. I shall look up what I have tomorrow and share.

 

[Old Deaf Donkey]

Hey ODD, glad to see you back!
Cowen has a wealth of 6SN7’s yet he buys more equivalents lol. Now power tubes are another matter. I am working from home and finally building an amp for myself now that Bill and Ripper have one and several other friends. Mine will be a bit unusual.

Thanks, Tom. Wow, Rotary rocket launchers!

 

[Paladin79]

Thanks, Tom. Wow, Rotary rocket launchers!

Lol ladder pots but they will match pretty well.

 

[quimbo]

I need some help understanding numbers. I reached out to a tube seller for a few specific items. Here is what he has

Tung-Sol 6SN7GT Mouse Ear tube, Tests at 90/95. Min is 50.
Price is $45 (number on the tube is 322202)

National Union CNU 6SN7GT WWII mil spec. Tests at 105/105. Min is 50.
Price is $50

National Union 6SN7GT T-Plate tube. Tests at 100/100. Min is 50.
Price is $5

What do these numbers mean? 90/95? 105/105?

Thanks

 

[bcowen]

I need some help understanding numbers. I reached out to a tube seller for a few specific items. Here is what he has

Tung-Sol 6SN7GT Mouse Ear tube, Tests at 90/95. Min is 50.
Price is $45 (number on the tube is 322202)

National Union CNU 6SN7GT WWII mil spec. Tests at 105/105. Min is 50.
Price is $50

National Union 6SN7GT T-Plate tube. Tests at 100/100. Min is 50.
Price is $5

What do these numbers mean? 90/95? 105/105?

Thanks

Without knowing what tester he is using, those are either emission or transconductance (GM) readings. Simply put, the output level of the tube(s). And without knowing the state of calibration of his tester those numbers are, quite honestly, meaningless. If his tester is calibrated to factory specs, those are good readings. If not, they're just numbers.

$5 for an NU T-Plate? Or is that a typo?

 

[quimbo]

Without knowing what tester he is using, those are either emission or transconductance (GM) readings. Simply put, the output level of the tube(s). And without knowing the state of calibration of his tester those numbers are, quite honestly, meaningless. If his tester is calibrated to factory specs, those are good readings. If not, they're just numbers.

$5 for an NU T-Plate? Or is that a typo?

Not a typo on my part

 

[bcowen]

Not a typo on my part

I've never heard that particular version, but probably any National Union that tests well for $5 is most certainly worth a shot, IMO.

 

[bcowen]

Lol ladder pots but they will match pretty well.

And here I thought they were gas turbines to, you know, make it sound really fast. Probably GE-made turbines though...

 

[quimbo]

And here I thought they were gas turbines to, you know, make it sound really fast. Probably GE-made turbines though...

Thank you.

 

[Old Deaf Donkey]

Thanks. I shall look up what I have tomorrow and share.

Now, @bcowen that was what I remembered having. Looks rather similar to your Tung-Sols, and sound gorgeous, too

 

[Deyan]

Well waiting for an answer for the transformer regarding the tube tester project.

 

[PsilocybinCube]

Well waiting for an answer for the transformer regarding the tube tester project.

I have a batch of inexpensive 6sn7 tubes coming. Can't wait for the tester so I can make sure they don't fry my amp!!!

 

[tafens]

I have a batch of inexpensive 6sn7 tubes coming. Can't wait for the tester so I can make sure they don't fry my amp!!!

+1, and also to see if the dull sound from some tubes I bought off of eBay is because the tube just is that way or if it’s “NOS” but still worn out...

 

[Old Deaf Donkey]

+1, and also to see if the dull sound from some tubes I bought off of eBay is because the tube just is that way or if it’s “NOS” but still worn out...

The tube does not have to be "worn out" to give "dull sound". Some sound dull to your ears in your equipment even if they are in mint condition, eBay not to be blamed - or they are screeching like mad. Ask @bcowen about GE tubes... Some octals need to be resoldered - ask @Paladin79

 

[PsilocybinCube]

+1, and also to see if the dull sound from some tubes I bought off of eBay is because the tube just is that way or if it’s “NOS” but still worn out...

I purchased them from a seller on NC. Curious if @bcowen has any experience with them...
https://www.ebay.com/str/ibismachine