The JLM99MBv2 PCB for the JLM99V which can take several transformers from manufacturers like OEP, Lundahl & Jensen. The board also has NE5534A DIP8 sockets so it can be fully tested with cheap IC's before installing the 99V. The PCB can be used for building the simplest NE5534A, OPA604A or 99V, 990,…