Nelson: Are we getting anywhere close to your F6, or have we (I) diverged towards different designs that might have some merits of their own, or are we clueless?
The hunt for the sweet spot; maybe?
The attached file [sweetspot.pdf] shows two Pass schematics from his article on BA 3. Figure 1 is the BA 3 Front End. Its input is driven by [for example] the volume-controlled headphone output of a high quality CD player or other sources; including test equipment to measure %THD etc. for relating to the subjective performance. Its output drives a high quality headphone. I suggest that this set-up [in stereo] may enable the DIYer to identify and hear the sweet spot, and later measure its salient properties. A training aid of sorts. Ditto for Figure 2 which is the official BA#1 SE output stage. Finally, ditto for the integrated schematic of Figure 1 driving Figure 2 [not shown].
The attached file [sweetspot.pdf] shows two Pass schematics from his article on BA 3. Figure 1 is the BA 3 Front End. Its input is driven by [for example] the volume-controlled headphone output of a high quality CD player or other sources; including test equipment to measure %THD etc. for relating to the subjective performance. Its output drives a high quality headphone. I suggest that this set-up [in stereo] may enable the DIYer to identify and hear the sweet spot, and later measure its salient properties. A training aid of sorts. Ditto for Figure 2 which is the official BA#1 SE output stage. Finally, ditto for the integrated schematic of Figure 1 driving Figure 2 [not shown].
Schematic for a potential clone of F6 and/or burning amplifier?
The beauty about Pass schematics is their high versatility to mix and match on paper with ease; [cut and paste paper copies]. The attached file [name it.pdf] shows an interstage transformer [e.g. the Jensen of Conceptual F6] coupling a BA 3 Front End with part of a BA#1 SE output stage. Rush: you may have shown a schematic like it in an earlier post of this thread. Is this schematic also useable to make a potential burning amplifier? Looks hot and high caliber to me.
The effect of the interstage transformer on the "sweet spot" may be used in a continuation study of my previous post. Is the sweet spot still there?
The beauty about Pass schematics is their high versatility to mix and match on paper with ease; [cut and paste paper copies]. The attached file [name it.pdf] shows an interstage transformer [e.g. the Jensen of Conceptual F6] coupling a BA 3 Front End with part of a BA#1 SE output stage. Rush: you may have shown a schematic like it in an earlier post of this thread. Is this schematic also useable to make a potential burning amplifier? Looks hot and high caliber to me.
The effect of the interstage transformer on the "sweet spot" may be used in a continuation study of my previous post. Is the sweet spot still there?
Thanks ZM. I hoped the normally available volume control on the CD player's headphone amp was sufficient. I agree with you that more attenuation of signals [in/out in Figure 1] will be needed to prevent hearing and equipment damage for the experiments solo Figure 1 and the integrated Figure 1 and 2. Maybe be not for the solo use of Figure 2; as it looks to me a unity gain power stage. May still need added caution!be aware that , without attenuating net , that hunt can be extremely short
and , after that , no further need for any sonic hunt
