Dutch PTT wire broadcast speaker VOX AC-4 Build

As intermezzo I did a rebuild from my Dutch PTT wire broadcast powered speaker amp and made it into a VOX AC-4 with some tweaks

I junked the original EL41 pair used as preamp and power amp and used a EF86 and EL84 set. I also added a power transformer since the original was fed directly using the plain line voltage. too dangerous IMHO.

The first attempt was a quick and dirty rewire of the original board and it worked Ok but there was some oscillation when volume maxed out.

I decided to rebuild it on a proper aluminum box and FR-4 carrier boards with eyelets.

That worked much better. Unbelievable how quiet this thing is.

 

Dutch PTT wire broadcast speaker VOX AC-4 Build