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 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 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.
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.
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.
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.
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.
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