boxing day at the beach was pretty nice
sound is powerful yet articulate and wide with 2 x OPA827 on this adapter its decoupled with silmic II bypassed with vishay COG 0.1uf, just wrapped the silver ground wire around the ground terminal of the power rail caps for now
I have a silmic II on the other side as well, but for these pics hadnt sorted out how I would fit it in the amp with both. i'm still running stock caps in the amp bar the UTSJ 10000uf, will be installing a few nichicons tomorrow and when everything else arrives i'll go to town on the amp and power supply/wall-wart. I
also have this 2 x OPA211 with blackgate and vishay COG, with custom cryo silver pins, but the BG wont fit like this and also the 22uf NXHQ is only rated to 6.3v, thought I would show it anyway as it shows what is possible with these adapters
and the underside with silver pins
and these are the diamond buffers with sanyo oscon SVP SMD, with temporary adapters on the end till I work out placement properly. i'll still leave the sockets in the amp to allow me to keep fiddling, but will simply push the SCSCAg directly into the sockets to save a little space
as you can see I dont mind a little cardas flux for SMD soldering
its noclean so its no drama, will clean it up soon, when I can be bothered, as the white PCB certainly shows it off
here they are fitted bar the grounding
as you can see its a little tight, but doable and i'll still be able to fit the upgraded caps in the amp. If things get really squeezy I have some lower profile organic polymer caps from AVX, not cheap either; I have a few spare from my ackodac build. I built another 2 pairs of these buffers as well; a pair with 100uf Nichocon FG and another pair with some pansonic bypassed with 0.1uf BG; no chance those ones will fit though. I could probably fit the Nichocon ones with some coaxing and with just plugging the wires directly into the sockets. the input filter has been omitted for now, will leave it out unless needed
and the gaggle of parts for my (not so) discrete rig and a ring-in
i'll find a way to fit the Burson discrete opamp in there somehow, but not for a little while
so Ryuzoh, i'm assuming this rather errrmm 'star-like' formation on the underside of the board at the UTSJ is the star-ground? certainly would seem right and it couldnt look more like a star if you tried
I flipped the board over to have a look and that kind-of stood out to me. I wasnt expecting anything so 'X marks the spot' if its not the star-ground for the whole amp, it surely is for the power supply
so yeah loving the amp with OPA827 in OP and 2xstack of BUF634P in buf (till I work out the SSB01 grounding) i'l stick some 634u on the bottom even if i'm running the discrete buffers. thinking I may even whack some OPA211AID on the bottom there actually. really want that much of a fan of the LME49720HA in there myself. having to use the amp in high gain just wasnt doing it for me. on low gain it was for lack of a better word; a little dull. bass was really lacking IMO. sounded grea5t in high gain, but thats just not practical, pity because I really like that chip. will see what its like in ground and give it another try when the buffers are installed.
for the moment OPA827 wins hands down
so can I confirm that the switches are ON when the switch is pushed towards the word ON? or away from ON? if towards the amp came supplied without the BUF in high current mode.
and what you said to Theory87 regarding the unbalanced bypasses. you just meant that the supplies to each chip needed to be the same in value yes? not that each pair of C2/CP2 C3/CP3 C4/CP4 had to be identical caps, only that C2=C3=C4 and CP2=CP3=CP4 etc correct?
i'm withholding my detailed impressions until I get my head around the sound some more and do a bit more tweaking. then i'll compare against a certain other portable in my stables