The Other John Browne's TAD Tube Test

[7704A]

Cool stuff.
@the other John Browne since you found some phase differences between the files, something to try in the future would be to see if you get phase differences between two takes from the same set of tubes.

 

[the other John Browne]

Cool stuff.
@the other John Browne since you found some phase differences between the files, something to try in the future would be to see if you get phase differences between two takes from the same set of tubes.

Cheers. Thanks for sharing. Yeah, this was just meant as a quick test but the scope expanded throughout the test. Some valuable lessons learned when it comes to the tools used. For further testing, the methodology needs to be tested/challenged/scrutinized more.
As you said, testing the same configuration twice or more times, maybe on different days even will be a must just to gauge the general fluctuations.

 

[7704A]

Cheers. Thanks for sharing. Yeah, this was just meant as a quick test but the scope expanded throughout the test. Some valuable lessons learned when it comes to the tools used. For further testing, the methodology needs to be tested/challenged/scrutinized more.
As you said, testing the same configuration twice or more times, maybe on different days even will be a must just to gauge the general fluctuations.

Yeah sure thing, I appreciate your meticulous engineering approach to getting to the bottom of things, it's refreshing. Good luck on future tests!

Also you asked about acoustics in the video. I'm no expert, but I picked up these two books which seem to be highly recommended as foundational to modern sound stuff:

Music, Physics, and Engineering by Harry F. Olson​

Acoustics by Leo L. Beranek​

​

I quite like them so far and have found them informative. Opening up Beranek and discovering that they treated waves in the complex exponential notation was a pleasant surprise. The main thing they don't have, at least that I'm aware of, is a treatment of Thiele-Small parameters and the (somewhat) contemporary box tuning approaches based on well-known filter circuits.

Depending on how into the weeds you're getting with tube testing, a good comprehensive book on them would be:

Theory and Applications of Electron Tubes by Reich​

​

If you ever wanted series expansions of plate current, well Reich has 'em.

 

[the other John Browne]

Yeah sure thing, I appreciate your meticulous engineering approach to getting to the bottom of things, it's refreshing. Good luck on future tests!

Also you asked about acoustics in the video. I'm no expert, but I picked up these two books which seem to be highly recommended as foundational to modern sound stuff:

Music, Physics, and Engineering by Harry F. Olson​

Acoustics by Leo L. Beranek​

​

I quite like them so far and have found them informative. Opening up Beranek and discovering that they treated waves in the complex exponential notation was a pleasant surprise. The main thing they don't have, at least that I'm aware of, is a treatment of Thiele-Small parameters and the (somewhat) contemporary box tuning approaches based on well-known filter circuits.

Depending on how into the weeds you're getting with tube testing, a good comprehensive book on them would be:

Theory and Applications of Electron Tubes by Reich​

​

If you ever wanted series expansions of plate current, well Reich has 'em.

Brilliant! I'll look into those. Thank you!

 

[DanTravis62]

Nice! @the other John Browne makes way fucking cooler videos than John Browne 1.0, that guy seems like a zoomery drop Q "modern" guy and its kind of annoying

 

[lespaul6]

TAD el34s are rebranded JJ's or Russian? can't recall

 

[the other John Browne]

TAD el34s are rebranded JJ's or Russian? can't recall

I think the Blackplate and EL34B-STR are from Shuguang and the Redbase are PSVANEs