-I corrected the few mistakes I made. Firstly, I redid the circuit for a dual-rail supply. Secondly, I added a volume pot and a buffer before the output.
-To implement the asymmetric clipping, I added differently valued resistors in series with the diodes. These reflect the asymmetrc ratio of your load line guesstimate.
-In the first stage the negative lobe gets clipped more, in the second the positive, etc. (since the signal itself is not inverted)
-As for the respective gain of the stages, I'm not really sure what to make of them. To go by the theoretical gains of the individual tube stages (50x or 34dB) would probably yield too high signals and too much clipping.
-As for now: I've finished the schematic and a layout with it. It's time to stop the work for today (I'm getting hungry). In the next days I'll go over it a few times to check for basic feasibility. If the basic topology is satisfactory, I'll fab a pcb next week and put sockets in place of the ambiguous components, e.g. feedback resistors, diode-resistors
As a closing note; I will wholeheartedly and directly admit that I'm not an electronic engineer, nor do I have extensive knowledge of tube amplifiers. Therefore I sometimes revert to the build-and-tweak approach. Something I can afford because our local hackerspace had an entire component library donated, and the local polytechnique grants me acces to their PCB-facilities just because.
I'll advance in Micro-Increments
-To implement the asymmetric clipping, I added differently valued resistors in series with the diodes. These reflect the asymmetrc ratio of your load line guesstimate.
-In the first stage the negative lobe gets clipped more, in the second the positive, etc. (since the signal itself is not inverted)
-As for the respective gain of the stages, I'm not really sure what to make of them. To go by the theoretical gains of the individual tube stages (50x or 34dB) would probably yield too high signals and too much clipping.
-As for now: I've finished the schematic and a layout with it. It's time to stop the work for today (I'm getting hungry). In the next days I'll go over it a few times to check for basic feasibility. If the basic topology is satisfactory, I'll fab a pcb next week and put sockets in place of the ambiguous components, e.g. feedback resistors, diode-resistors
As a closing note; I will wholeheartedly and directly admit that I'm not an electronic engineer, nor do I have extensive knowledge of tube amplifiers. Therefore I sometimes revert to the build-and-tweak approach. Something I can afford because our local hackerspace had an entire component library donated, and the local polytechnique grants me acces to their PCB-facilities just because.
I'll advance in Micro-Increments