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a good approach. Now the collector current of the drivers nearly constant (compared to before, where this one at the same time was the base current of the output power devices.
By the way, I want to have a transition to a circlotron by the same basic topology than this circuit for more symmetric behavior and therefore I start this thread some months ago:
http://www.diyaudio.com/forums/solid-state/146586-conversion-hiragas-le-monstre-circlotron.html
But obviously this is more difficult (unlike to a single-stage topology)
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A1943 is the same generation
BUT the true complementary is the old brother 2SA1903
easy to found near 50hFE with 2SC2500
tiefbassuebertr see this
http://www.diyaudio.com/forums/soli...iragas-le-monstre-circlotron.html#post2037401
BUT the true complementary is the old brother 2SA1903
easy to found near 50hFE with 2SC2500
tiefbassuebertr see this
http://www.diyaudio.com/forums/soli...iragas-le-monstre-circlotron.html#post2037401
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the code of generation before 2SA1943
IS 2SA1302
SORRY
And not Hiagra, but Hiraga. 😉
After more matches type of transistors, i born this list below.
2SK246/2SJ103
BC550/BC560
2SA1540/2SC3955
2SA1943/2SC5200
an other idea you will find here
https://www.diyaudio.com/community/threads/i-call-it-infinitron.270239/
https://www.diyaudio.com/community/threads/i-call-it-infinitron.270239/