Stanney2001
Member
Great. Thank you Jonathan.
Thank you.yes i believe so - 220nf/100V polyester ... even though the Qudos is different the recommendations for film caps on the acoustica page probably won't steer you too wrong ... http://www.acoustica.org.uk/t/naim/power_amps.html
Thank you.
Hoping to build a nap135.
Thank you.
Hoping to build a nap135.
The Naim NAPA circuit was based upon a quasi-complementary RCA design. At that time PNP power transistors were rare, expensive and somewhat flaky compared to the equivalent NPN devices which explains why quasi-complementary circuits were the norm. Naim did use the 2SC2922 for some NAP140s but fitting one of these and a 2SA1216 would have required further changes to the circuitry and PCB layout to accommodate a fully complementary design.
The Avondale NCC200 circuit brought a number of important improvements to that basic design but it remained quasi-complementary with the need to add a diode into the lower half of the output circuit. The Qudos (NCC220) circuit, by contrast, is fully complementary with both NPN and PNP power devices in the output stage, this, together with other improvements including an improved version of the input LTP circuit are, IMHO, why the Qudos sounds so good.
They will drive Isobariks....
is it feasible to convert a NCC200 to a NCC220 Im at the stage where I've just finished the NCC200 board build and was wondering about modifying them to be NCC220.
Is the sound difference that great?
Yes its a drop in replacement.Would these be a straight swap for the NAPA boards in my power amps. It’s already a bit of a squeeze.
I’ve been planning something more exotic for my retirement system but the mscaler has just eaten a huge hole in my budget.
is it feasible to convert a NCC200 to a NCC220 Im at the stage where I've just finished the NCC200 board build and was wondering about modifying them to be NCC220.
Is the sound difference that great?