Playing with the Pleiades BD139 one transistor amplifier and almost nothing else.
Biasing rssitor is 12ΚΩ. For schematic see yesterday's post etc.
DC voltage across 4Ω Tesla speaker on linoleum Pleiades Auratone 5C type cube is 300mV.
So current is less than 100mA.
Amplifier still sounds very nice, not loud.
It might be a good exercise to see how loud can this setup be made without losing the quality of sound.
See also next posts.
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