[tagosaku]

Quote:

Any input on the Raytheon's below?  I'm terrible at ID'ing tubes.....
 
 

 
Did Raytheon make these? Looks similar to GE.
 

 

[rosgr63]

Quote:

Gonna shoot another question to you experienced folk.
 
For those 6SN7 tube amps that can also get by with 6F8G tubes, are there any benefits to using them sonically?  They seem to be cheaper than 6SN7s, even when you account for the adapter.

 
 
Some 6F8G tubes have plate structures that the 6SN7 don't have and they sound different.
Now it will depend on your system and personal preferences whether you'll like them better or not.

 

[Skylab]

I agree. Also, the 6F8G will work in ANY amp where the 6SN7 will work, assuming you have the adapter required for accomodating the 6F8G. Aside from the different construction (base, pin config, grid cap), the electrical properties of the two tubes are identical.

 

[musicman59]

I personally like them better than the 6SN7. I have some Reytheon, RCA, Sylvania, TubngSol and Emerson (made by Tungsol). Some have gray glass, others black. Some have flat plates and others round plates.
For instance I like better my Tungsol 6F8G Black Glass/Round Plates than my Tungsol 6SN7 Black Glass/Round Plates but I agree it all depends of you taste.
 
For the cost of the adapters and the tubes it is worth to give them a try to see if you like them.

 

[mrAdrian]

Quote:

 

I echo with you, the tubes look like a GE to me, but I'm inexperienced ;p

 

[suikodenii]

Can anyone provide some insight into or impression of the following tube that I bought recently? It says Rogers, although not in the usual plain/bold logo that I know from Rogers.
As well it says JAN CQ 6SN7GT (on the tube as well) and I couldn't find any mapping of "CQ" on the net...is that for Rogers?
Are they likely made by Rogers or rebranded? It has, from what I understand, T-shaped plates, vertical code of 151, three holes and extra supports...but I am still a tube noob
 

 
Thanks a lot to those willing to share some insights!
 

 

[rosgr63]

Rogers Elect. Corp. has the Manufacturer Code 677 and the military identifier CQ.
 
It looks as though the plates are at an angle so if that's the case it's a GTB type tube for military use.

 

[suikodenii]

Rogers Elect. Corp. has the Manufacturer Code 677 and the military identifier CQ.

It looks as though the plates are at an angle so if that's the case it's a GTB type tube for military use.

Thanks! The plates are not angled but are facing each other with the "top part" of the T. On the chrome top it says 6SN7GT.

 

[Xcalibur255]

It may well be Canadian made under license from Sylvania.  I don't know enough to say for sure.  The plates look like Sylvania, but the exposed bottom mica and gettering that doesn't extend past the top mica is a combination I haven't really seen with the 3-hole t-plate before.  It's possible it is a t-plate style Sylvania GTA with a slightly shorter plastic base, then the pieces of the puzzle would fit.
 
How does it sound?

 

[Xcalibur255]

Quote:

I echo with you, the tubes look like a GE to me, but I'm inexperienced ;p

GE uses a different style of mica.  It actually is made by Raytheon, that was the final GTB type made by them before they began importing tubes from elsewhere and putting their name on them.

 

[rosgr63]

Just found out that Tung-Sol made 6SL7 Black Glass Grey Round Plates.
I thought they were only Black.
 
 
 

 

[2359glenn]

Quote:

Just found out that Tung-Sol made 6SL7 Black Glass Grey Round Plates.
I thought they were only Black.
 
 
 

I thought that almost all 6SL7s were round plate

 

[rosgr63]

Yes, but the Tung-Sol I thought had Black Plates not Grey.
 
Here are some different style plates:
 
 

 
 

 

[rosgr63]

6SN7 Exposed.
Base removed and photographed by Bruno my French Tube Guru.
He was trying to repair a rare tube but the electrodes were corroded and cut flush with the glass.
 
 
 

 

[sridhar3]

Quote:

6SN7 Exposed.
Base removed and photographed by Bruno my French Tube Guru.
He was trying to repair a rare tube but the electrodes were corroded and cut flush with the glass.

 
Isn't posting pornographic images on Head-Fi against the ToS?