[whirlwind]

 

   
I may have to try them as drivers....did you use the adapter and run two tubes as drivers ?
 
I really like the 6BX7 tubes as power tubes

 
No, when used as a driver, I run them one at a time.
 
While I have enough Fivre 6BX7 to use them as output tubes, I have found these adapters to be a bit too flimsy to allow me to do much rolling. Pulling tubes in and out seems to overly flex the plastic frames, causing the screws to come loose, and I worry that I might inadvertently break them. So no more rolling 6BX7 or 6BL7 as output tubes with the current adapters. I have four good ones installed now and plan to leave them as is. But eventually, I expect that I will get a second set of adapters....
 
So the only reason I run these tubes as drivers is to test them to make sure I haven't received a dud. And of course, at the same time, it gives me a chance to learn how they sound.

Thanks Ken...I will try one 6BX7 as a driver sometime and see what I think about it.
 
The EL3N adapters that take two tubes are even worse!

 

[attmci]

This is a Raytheon rebanded Japanese 6BL7GTA.
 

 

[gibosi]

My guess is that it is an Hitachi. Raytheon was one of the first American companies to outsource the bulk of their vacuum tube production to Japan. And sometimes you see these out-sourced tubes branded as Hit-Ray.

 

[attmci]

I am pretty sure there is no debris inside the Amperex tube.

 

 

 

[attmci]

Rare 6BX7
 

 

[attmci]

Hi L,

Just curious if these Mullards are rebranded US made tubes

Same here. The pic on Ebay looks like RCA.

 

[Oskari]

This is a Raytheon rebanded Japanese 6BL7GTA.

My guess is that it is an Hitachi. Raytheon was one of the first American companies to outsource the bulk of their vacuum tube production to Japan. And sometimes you see these out-sourced tubes branded as Hit-Ray.

There is some evidence that the Japanese maker of 6BL7GTAs was NEC. Unfortunately I can't find a photo at the moment.

 

[gibosi]

国内では，大型TVの製造は1960年代に入ってからだったので，6BX7-GTは東芝が1959年に，6BL7GTAはNECが1962年に国産化しました。
 
http://www.geocities.jp/radiomann/HomePageVT/TV_Ver_Triode.html#1
 
Roughly translated: To accommodate the larger CRTs being introduced in the 1960's, Toshiba began manufacturing the 6BX7GT in 1959, and following in 1962, NEC began manufacturing the 6BL7GTA.
 
However, I seem to remember seeing somewhere that other Japanese manufacturers, including Matsushta, manufactured one or both of these tubes for domestic consumption.....

 

[Oskari]

国内では，大型TVの製造は1960年代に入ってからだったので，6BX7-GTは東芝が1959年に，6BL7GTAはNECが1962年に国産化しました。

http://www.geocities.jp/radiomann/HomePageVT/TV_Ver_Triode.html#1

Roughly translated: To accommodate the larger CRTs being introduced in the 1960's, Toshiba began manufacturing the 6BX7GT in 1959, and following in 1962, NEC began manufacturing the 6BL7GTA.

There's that. Also, some time ago I sent this link to mordy: http://yahoo.aleado.com/lot?auctionID=w150493721. I think there was a photo of a NEC 6BL7GTA looking much like the Japanese Raytheons there, but alas no more.

 

[gibosi]

These are labeled NEC, but the construction is a bit different than the Raytheon.
 
http://yahoo.aleado.com/lot?auctionID=h253196313

 

[Oskari]

These are labeled NEC, but the construction is a bit different than the Raytheon.

http://yahoo.aleado.com/lot?auctionID=h253196313

That's true. Must be a different version / manufacturer.

 

[attmci]

  These are labeled NEC, but the construction is a bit different than the Raytheon.
 
http://yahoo.aleado.com/lot?auctionID=h253196313

Mine is very similar to this one: http://www.ebay.com/itm/1-SELECTRON-6BL7GTA-NOS-NIB-Radio-Vacuum-TUBE-Tested-ham-JAPAN-6BL7-GTA-/370865992597
 
So  now the question is "who made the realistic Japan tubes"?
 
Then I found this:
 
Does anybody have any info about the tubes Radio Shack used to sell?
All i know is that many of them were made in Japan at the Matsushi_ta plant set up by Mullard.
Lots of them were labelled Realistic/Lifetime brand. Some had gold pins, etc...
 
Panasonic Corporation formerly known as Matsushi_ta Electric Industrial Co., Ltd is a Japanese multinational electronics corporation headquartered in Kadoma

 

[Oskari]

Mine is very similar to this one: http://www.ebay.com/itm/1-SELECTRON-6BL7GTA-NOS-NIB-Radio-Vacuum-TUBE-Tested-ham-JAPAN-6BL7-GTA-/370865992597

The same Realistic-branded: http://www.ebay.com/itm/NOS-Realistic-Japan-6BL7GTA-2-Grey-T-Plate-O-Get-GOLD-PINS-Vacuum-Tube-100-/122324333828

So  now the question is "who made the realistic Japan tubes"?

Then I found this:

Does anybody have any info about the tubes Radio Shack used to sell?
All i know is that many of them were made in Japan at the Matsushi_ta plant set up by Mullard.
Lots of them were labelled Realistic/Lifetime brand. Some had gold pins, etc...

Panasonic Corporation formerly known as Matsushi_ta Electric Industrial Co., Ltd is a Japanese multinational electronics corporation headquartered in Kadoma

However, I seem to remember seeing somewhere that other Japanese manufacturers, including Matsushta, manufactured one or both of these tubes for domestic consumption.....

6BL7 or 6BX7 don't appear in this Matsush¡ta catalog: http://frank.pocnet.net/other/Matsush%69ta/Matsush%69ta_Receiving-Tubes_1971.pdf

 

[attmci]

The same Realistic-branded: http://www.ebay.com/itm/NOS-Realistic-Japan-6BL7GTA-2-Grey-T-Plate-O-Get-GOLD-PINS-Vacuum-Tube-100-/122324333828

6BL7 or 6BX7 don't appear in this Matsush¡ta catalog: http://frank.pocnet.net/other/Matsush%69ta/Matsush%69ta_Receiving-Tubes_1971.pdf

That one has gold pins.
 
Not sure about the age of the tube. Maybe earlier than 1971?

 

[Oskari]

That one has gold pins.

Cosmetics!