This one is for J0K3RX, because nobody would post samples
: a video of an experiment started by this very thread. Although I cannot say it is an AMT clone anymore.
I started from the B1 schematic, but with 2SK117 JFETs. Because of too much gain I took out one FET stage. The tonestack is a scaled FMV - I tried some variations, but I don't like it. I made some experiments with the Hiwatt tonestack and the results are promising.
The cabsim is almost the same as here (last post on the page)
, the only differences being C1, C2 and C4. It's switched by a DPDT mini toggle.
It's working way better at 18V.
I am very please with the results as they are right now. Maybe there are too many treble-bleeds (on the guitar, on the chipamp volume control, and who know where else). The true-bypass idea was definitely not good without a PCB layout to match. And this is the sound of an chipamp into a Hi-Fi speaker, through a PC microphone, and then through YouTube. The real thing is much better. I am really impressed.
On the improvements list I have an input buffer (right now is true-bypass and it oscillates on higher settings of the TREBLE knob), some kind of input level adjustment (maybe a peak detector?) and a buffered Hiwatt tonestack. Maybe I'll keep two JFETs in it, though