I’ve just built my first Ambika “from scratch”, and love it! It has 6x SMR4 filters, and I also had Polivoks filter PCBs made as well, which will be going into a second Ambika in the next few months. I probably won’t build a third Ambika, but I hope to keep the GAS at bay for the next year or two building different filterboards, and I’m wondering if there are any options I’m not aware of?
There are the official boards, SMR4, 4PM, and SVF. Then there’s the Polivoks, and the Ladder by TubeOhm (which I don’t believe is open source). Am I missing anything?