![]() I've run many simulations over the past weeks and I think the instability issues can be really narrowed down to the output stage itself. However the problem with this type of design is that I cannot get it running stable. ![]() I did like the output stage however and I tried designing something similar using more modern plastic-cased transistors. In any case, I have a pdf available if anyone is interested. I don't think it is worth the effort to build this design as both input stage and VAS are very simple and I assume that the performance won't be very good. Czech magazine "amatorske radio" published this design back in 2000. I thought the next best thing would be to connect the output transistors in series just like in the "low-end zesilovac 1kW" from Alan Kraus. There are complementary 350V bipolar transistors available from On-Semi, but the problem with these is that they're almost useless at these voltages due to SOAR limitations. ![]() ![]() ![]() Unfortunately there are no additional secondary taps available and thus the amplifier will have to be class B with no sliding rails. The story is as follows: I managed to get an excellent deal on two used 1600va 2x115V secondary toroidal transformers and right now I'm contemplating building a very large amplifier around these two. I hope I did get the name of the topology right. ![]()
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