Many years ago when this amp v1.2 was made available , I succesfully put together a kit and have enjoyed it immensley since then . Just recently I checked and adjusted the bias ( it was still within limits but tweeked it a bit) and I wondered if there are mods to this initial version that would sonically improve its performance. I really dont understand the "workings" of this amp but I am capable of putting things together and so having said that I welcome your input. Regards
Paul
Paul
I don’t recall if that version included R15, a 2.21k resistor connected between the Base and emitter of Q3. If R15 is missing, that would be the first thing to add; it helps increase the current through the output transistors.
After that, there is a whole thread dedicated to ACA modifications.
After that, there is a whole thread dedicated to ACA modifications.
I found this info in the build guide:
”PS V1.5/V1.6 owners: In October will be offering V1.5/V1.6 to V1.8 make-up kits for builders who have already built a V1.6 (or earlier) and want to bring it up to V1.8 specification (or build matching monos). We'll email you when they are available.”
https://guides.diyaudio.com/Guide/Amp+Camp+Amp+V1.8+Change+Information/10?lang=en
”PS V1.5/V1.6 owners: In October will be offering V1.5/V1.6 to V1.8 make-up kits for builders who have already built a V1.6 (or earlier) and want to bring it up to V1.8 specification (or build matching monos). We'll email you when they are available.”
https://guides.diyaudio.com/Guide/Amp+Camp+Amp+V1.8+Change+Information/10?lang=en