So in my quest to get back to where I was 25 years ago, I landed a scrap yard find of unique fratuers for bi amplification of my 206 reference monitors. Much more to say. I will make this my DIY home thread & consolidate all projects here How about class a bias for these ? Those are simi complimentary BP transitors(?). As there are 2 different of the same size & an oddball smaller one. .. I did not examine it long. TFE perf boards anyone? https://www.diystompboxes.com/smfforum/index.php?topic=60933.40 https://tubeamplifierparts.com/watts-store.html/#!/Watts-Perf-Board-3-125-x-14/p/65263243 ALL THAT fiberglass resin, it is as bad/ worse than pvc as to diaelectic absorbtion. I did this to a Sony Ta-n90ss just add sinks as needed.