Arkless Electronics
Trade: Amp design and repairs.
2011 NAP200 near as damn it same FR as 1979 NAP250. I reverse engineered that as well...
It slopes up from 1KHz in both directions... that's what I meant by "troughs at 1KHz"...
Neil McBride reckoned your could remove all the buffer boards to advantage (using jumpers to complete the circuit in their absence).
it also mentions a "328 (Variable Level Line input with some HF filtering)" board as being fitted but I don't as yet have a schematic for that....
That was a “CD input” and it sounded dreadful. I guess it was intended to drop the level down to that of the vinyl and tuner input and to knock some top-end off in systems that were obviously optimised for vinyl.
is there a better input to use (tuner?) for digital feed?
also - (addressed to anyone) would there be significant advantage to using a 72 with buffers if I'm using reel to reel (recording and playback) ?
is there a better input to use (tuner?) for digital feed?
i seem to recall Naim (in their product literature) making a big deal out of the wide bandwitdth of their amplifiers ... DC to 40 or 100K or something along those lines ... i'm CERTAIN it's documented somewhere
Erm... no.. You did read all the posts of the actual frequency response of the various stages above? They are capacitor coupled between stages so DC impossible... and the power amps are slow old fashioned things which can't handle much above 30-40KHz or so comfortably and have a 60KHz filter on the input anyway.
OK whole Naim pre and power with MC board, 729 board, line stage and NAP250 power amp, no vol control just straight through is....... 1dB down @ 20KHz, 3 dB down at 34KHz and drops like a brick around 45KHz. In the bass 1dB down @ 44Hz and 3dB down @ 19Hz.
I have a Naim catalogue that states the frequency response of the NAP180 and up as -3db at 3Hz and 40KHz. Hope that helps.yes indeed i read them - and I'm just adding my bit - that i DISTINCTLY remember Naim touting this at one point ... it could well have been 'only' to 40KHz but that was an extremely impressive figure at the time and why I became interested in the Naim gear ... maybe i can find some of this literature however
and yes - see - you're just confirming what I'd read ...