[Wes S]

Makes you wonder when GE really took over ... They messed up Ken Rad real good...

That tube definitely comes to mind, when talking about height, and I was actually going to say that. The earliest taller bottle version of the black glass KenRad is the best.

 

[gibosi]

Seems maybe as the years went by they figured out they could save money on glass, by cutting down the size?

And the need to occupy less space in the equipment. Just like today, miniaturization has been an important engineering goal since the beginning.

 

[Wes S]

And the need to occupy less space in the equipment. Just like today, miniaturization has been an important engineering goal since the beginning.

Makes since, however I wonder how that affects the sound?

 

[gibosi]

Makes since, however I wonder how that affects the sound?

Everything else being the same, just a shorter bottle, I'm not sure the size of the bottle has any affect on the sound. But it might. However, given that the 6SN7 was originally designed as an RF amplifier, the engineers likely never considered how design changes might affect audio response.

 

[Wes S]

Everything else being the same, just a shorter bottle, I'm not sure the size of the bottle has any affect on the sound. But it might. However, given that the 6SN7 was originally designed as an RF amplifier, the engineers likely never considered how design changes might affect audio response.

I am thinking it might have some effect, as I almost always prefer a tall version to the short if there is both options.

 

[gibosi]

I am thinking it might have some effect, as I almost always prefer a tall version to the short if there is both options.

Similarly, I usually prefer the oldest version. And sometimes the oldest version is taller, but not always.

 

[Paladin79]

Makes you wonder when GE really took over ... They messed up Ken Rad real good...

According to my Tube Lore book, GE purchased Ken-Rad in 1944. I believe I read some of the Ken-Rad tubes may have been marked GE for a short time.

 

[JKDJedi]

Everything else being the same, just a shorter bottle, I'm not sure the size of the bottle has any affect on the sound. But it might. However, given that the 6SN7 was originally designed as an RF amplifier, the engineers likely never considered how design changes might affect audio response.

Who know these war time parts would be used for music. Veazy

According to my Tube Lore book, GE purchased Ken-Rad in 1944. I believe I read some of the Ken-Rad tubes may have been marked GE for a short time.

I think Ken Rad (build) stayed intact till after 1950...when GE started changing things..

 

[JKDJedi]

And when did GE purchase Sylvania? Or is that a myth.

 

[Ripper2860]

Maybe you're confusing GE with GTE. I believe GTE purchased Sylvania LAMP / bulb division -- not vacuum tubes, IIRC.

 

[Paladin79]

And when did GE purchase Sylvania? Or is that a myth.

I believe it was Philips who bought Sylvania.

 

[Paladin79]

This is part of a blind 6sn7 tube test I am working on. I just need to locate the proper size internal sleeve of aluminum that will fit over the glass portion of the tube and then it is a done deal. Vented at the top and with that sleeve, glass height will not be recognizable as in this example. Very sturdy yet it can be cut away easily to remove the tube later on. Also extensions are used with all tubes so a glimpse of the original tube base is not seen. The heat shrink tubing requires 257 degrees F, 125 C to shrink.

 

[JKDJedi]

This is part of a blind 6sn7 tube test I am working on. I just need to locate the proper size internal sleeve of aluminum that will fit over the glass portion of the tube and then it is a done deal. Vented at the top and with that sleeve, glass height will not be recognizable as in this example. Very sturdy yet it can be cut away easily to remove the tube later on. Also extensions are used with all tubes so a glimpse of the original tube base is not seen. The heat shrink tubing requires 257 degrees F, 125 C to shrink.

Oh my..... ☺ (I'll let @Ripper2860 & @bcowen finish that )

 

[Gazny]

I have a feeling that is the black glass Ken Rad, though it would be funny if it was a GE tube.

 

[JKDJedi]

I have a feel that is the black glass Ken Rad, though it would be funny if it was a GE tube.

Is that a Ken Rad in your pocket...or ya just happy to see me ..