And if you translate it into human language? I don't understand your cryptic phrases and graphs).
R302 C308 is an overload protection correction.
It is necessary to select it in such a way that the gain curve crosses 0 dB at the desired, smoother angle and that the phase shift of the amplifier without an input filter is no more than 120-150 degrees at the 0 dB point.
The larger the C 308, the more stable the amplifier is, but at the same time there will be more distortion on the treble and a worse clip.
It is necessary to select it in such a way that the gain curve crosses 0 dB at the desired, smoother angle and that the phase shift of the amplifier without an input filter is no more than 120-150 degrees at the 0 dB point.
The larger the C 308, the more stable the amplifier is, but at the same time there will be more distortion on the treble and a worse clip.
Attachments
By the way, which type of capacitors is more preferable there? Film, ceramics, mica? According to the service manual, ceramics are supplied for Europe, and film for Germany. In some other models, mica is placed. Maybe it is possible/ better to combine different types?
Some test suite made this amplifier spew RF in the MHz and thus it was required. Check out this diagram for this type of amps, seems the VAS has insufficient gain in relation to the LTP https://www.diyaudio.com/community/threads/morpheus-ultra-low-thd.406485/post-7547805
C317 increase the ULG frequency and methink that C308 is here to compensate this increasement and bring down the ULG frequency such that the circuit phase margin keep being within safe values.
That being said some sims would be necessary to be sure if it s for this purpose, keep in mind that even if C317 value is small it still have a big influence given that R326 has a quite high value.
That being said some sims would be necessary to be sure if it s for this purpose, keep in mind that even if C317 value is small it still have a big influence given that R326 has a quite high value.
Its rated at 125V I think. Rate it too small, it will fail, and the amp may self destruct. Or did you mean its type or value? Just use the correct value in C0G with high enough voltage rating. C306 is the Miller compensation cap and its not part of the input section, its part of the VAS (voltage amplification section).
It says 22pF for 590ES and 15pF for 690ES. HOW will the sound change from different capacitance values? It will become more/less treble or woofer...
Different values will make barely noticable tonal difference. It's not a tone controll.
Why don't you try yourself and decide? But check the square wave response in process to insure that stability is not compromised.
Why don't you try yourself and decide? But check the square wave response in process to insure that stability is not compromised.