Originally Posted by rjkdivin
Hey AMB....very nice looking build as usual. Is this physically the same size case as your M3 Prototype?
The Millett is smaller than my M³ proto. It is just a bit taller, but the width and depth are both smaller. Here is a pic of three of my amps together showing relative sizes (from left, clockwise: Modified SDS Labs amp, Millett Hybrid, M³).
In listening trials, how does the 'ease of listening' compare to the M3 which I find wondefully non-fatigueing for extended listening periods.
I haven't done much comparisons yet, should be interesting to do that. I'll be bringing all these amps to the San Jose meet so you could have a listen yourself.
Does the revised PCB incorporate the Diode modification to protect against polarity reversals discussed at the DIYForum.org ?
No. The "revised" refer to the board design from n_maher and drewd rather than the original one from Pete Millett (which is sold via diycable.com). The circuit already has a form of reverse voltage protection. If you look at the schematic, there is a self-resetting fuse at the DC power input, and then there is an protection diode across the supply. This diode normally has no effect, but will conduct and cause a virtual short if the input DC is reversed in polarity or if the voltage is too high, and that will in turn cause the fuse to open.