The Brief History of my life with SECA designs
The SECA amplifier designs have been in use for a long time from the early days of valves to the present day. With valves it was a simple matter of biasing the triode and having a transformer coupling to the loudspeaker. Even the first transistor...
I have just put together a very easy build of my SECA amp design.
Lots of details here:-
Here is the PCB layout.
And this is the basic circuit...