vA 361+ Power Amplifier // Acoustic 361 Design Fix

The Acoustic 361 Power Amplifier had a design flaw that would cause it to over-heat … in fact, the heat dissipation relied on moving air created by the speaker vent // a bit dicey of a strategy in my opinion.

This is my first attempt at cloning/modernizing the Acoustic 361, companion power amplifier to the Acoustic 360 pre-amplifier (head part) … initial bench results show the circuit able to drive 167 wRMS into a 4 ohm load // that’s on a fully loaded rail voltage (80.1 vdc at onset of clipping) … built using a beefed-up transistor set and a Roly Roper inspired heat-sensing fan circuit, the unit can now be expanded in power using this adaptive arrangement … above all, I plugged my mexi-Tele into the 360+/361+ combo and for the first time was blown away by the response of a fully SS system.

Of course, as a bass amp it delivers punchy (old-school) class-AB dynamics … which is/was a perfect match for the punchy sounding 360 preamp.