[jonathan c]

But there are two brown lines.

And one of them is flatlining....

That is the one….

 

[watchnerd]

But there are two brown lines.

And one of them is flatlining....

HAR!

BTW, where did the graph come from?

 

[jonathan c]

HAR!

BTW, where did the graph come from?

The graph fairy left it…

 

[gumisb]

HAR!

BTW, where did the graph come from?

I took those measurements on my mj2.
Feedback helps alot with power noise, 50Hz and harmonics 150Hz and 250Hz are elevated and clearly visible on next graph.

 

[watchnerd]

I took those measurements on my mj2.
Feedback helps alot with power noise, 50Hz and harmonics 150Hz and 250Hz are elevated and clearly visible on next graph.

I'm surprised 2nd is lower than 3rd and 5th.

Curious what tubes you were using?

 

[gumisb]

I'm surprised 2nd is lower than 3rd and 5th.

Curious what tubes you were using?

Tesla ECC88 with gold pins.

 

[watchnerd]

Tesla ECC88 with gold pins.

Interesting...I've got a pair of those, too.

They might not be my quietest, but they're not one of my noisier tubes.

 

[gumisb]

Interesting...I've got a pair of those, too.

They might not be my quietest, but they're not one of my noisier tubes.

I just switched to S4A E88CC for check. Noise level on high gain is quite similar but 2nd and 3rd harmonics are more or less equal. Raised 3rd H maybe caused by my rig.
More or less from my perspective you have to have amazing tubes and perfect power source to get closer to low gain performance in aspect of resolution, clarity, soundstage, etc. High gain wins in flow, musicality. Feedback on low gain is not perfect solution but looks as better compromise.

 

[watchnerd]

I just switched to S4A E88CC for check. Noise level on high gain is quite similar but 2nd and 3rd harmonics are more or less equal. Raised 3rd H maybe caused by my rig.
More or less from my perspective you have to have amazing tubes and perfect power source to get closer to low gain performance in aspect of resolution, clarity, soundstage, etc. High gain wins in flow, musicality. Feedback on low gain is not perfect solution but looks as better compromise.

Interesting. Do you know who makes the S4A for BTB? Because it's almost certainly a rebranded JJ, Russian, or Shuguang tube.

The 2nd & 3rd harmonics on the graph similar to what I've seen from my EH 6922s.

 

[gumisb]

No idea who makes them but they sounds better than Tesla and they have regular legs not gold one.

 

[watchnerd]

No idea who makes them but they sounds better than Tesla and they have regular legs not gold one.

Oh they're going to kick you out of the club for that!

New production better than NOS?

uh oh

 

[gumisb]

Unfortunately in this two tubes comparison there is no night and day difference, so nobody should run to near shop to buy new one or in panic sell old one.
Tesla is allrounder easy to listen, S4A has litte more high extension whit all benefits and consequences. That's all.

 

[watchnerd]

I just got a pair of HE6SE V1 (power hungry) and EQ'd them pretty aggressively using Oratory's curve (making them even more power hungry).

On high gain, with all the PEQ bands turned on, the Tungsram tubes I had in at the time were clipping a bit (who can blame them).

So I swapped in the LISST as a test (the LISST also clipped, but less).

But you know what...?

The LISST aren't that bad!!

But maybe it's because I have the better, early production OG LISSTs.

 

[G0rt]

Again late to the party, now warming up some new/NOS Brimar Footscray CV491 D-getters from Langrex, having learned from 5814a's that I do appreciate the more relaxed gain structure of the 12AU7 class.

Both sweet and quiet, I leave them on hi-gain even with my Grados, leaving plenty of headroom even for wild swings like John Kaizan's breathy shakuhachi.

This morning, pairing well with a fine, figgy Torre Isilo tempranillo.

 

[watchnerd]

Again late to the party, now warming up some new/NOS Brimar Footscray CV491 D-getters from Langrex, having learned from 5814a's that I do appreciate the more relaxed gain structure of the 12AU7 class.

Both sweet and quiet, I leave them on hi-gain even with my Grados, leaving plenty of headroom even for wild swings like John Kaizan's breathy shakuhachi.

This morning, pairing well with a fine, figgy Torre Isilo tempranillo.

Spanish wine in the morning?

That's a way to start a Sunday!