squalle

my guess is around 60-70c

LOL ours not even mentioned btw, hmm maybe shd try tying the input ground and pot's body together, with the output ground too the thing is, how to do that uncased?

kippei I just played around with different source I have this digital receiver with its own DAC hooking the SOHA to it, creates the same buzz and wheee... haha. now I know wat u mean. try on urs if it's the same. try put ur vol pot near max, will the buzz go away? it does on my setup my setup is like this: NVidia onboard soundstorm --> optic out --> digital receiver + DAC --> SOHA If I touch the case of the jack sockets (the body has some metal part), the buzz and whee sound go away. but, if i touch the pot, it becomes worse are these all the same?

haha pay me, I build SOHA for ur roomie SOHA supposedly to sound better than MHHA (no output cap and tube's running at a higher voltage) oh btw kross, I prefer tubes to ss

yup agree with that sound is just like food. you and me would prefer different kinda food

hmm maybe you just dont like tube sound?

it would be YOU then

errr why not each of us buy different ones and then we loan to each other to swap around? at least now there are 3 SOHAs, with all spotting SAME tubes! haha koba must be very happy

read in the headwize thread. errm see if the output oscillates erm imbalance? I think even alps blue would have that at near minimum. hmm right now two PCBs? hmm those folks at headwize planning to split signal part and PSU part. I dont think it should be a problem. can you chk if the ground output of ur LM317 is really 0 volt? chk the voltage agains earth may I know what source are you connecting it to? ADD: I saw this in head-fi, quoted from morsel: "Input ground, case, and pot shaft/housing should be tied together" I almost forgot abt that fact. so yea, try it. It solved my problem for my 1st amp I built

that blooze guy in this page having similar problem with you guys http://headwize.com/ubb/showpage.php?fnum=...5896&fpage=9999 wonder why... any of you have access to oscilloscope?

then try checking ur ground on the volume pot yeah, go check all connections. use old toothbrush and brush over hard enuff to break a loose connection that's what I did and managed to get my protection diode loose then cause oscillation on my output op-amp

Is your ground a real ground or just a floating virtual ground? mine comes from the centre tap of the trafo and I dont do exactly a star ground I made 2 units, 1st one using a ground "lane" (not even a plane, LOL) 2nd one somehow a star ground, per module basis like I've elaborated above. both are OK maybe it's the AC signal that's interfering and also have you check for loose connection. the buzz comes from both sides? ADD: the buzz happens when the input is there, but of course no song's playing or with no input. if no input then it buzz, it's somehow normal especially when you dont put volume pot

for me, somehow erm, the ground is placed at a spot where from all "modules" are about of equidistant modules here are like, 12v PSU, then ground for tube,ground for signals nothing much special... gotta see ur amp man... hard to play guessing work

errrmm not really I did try running the exact same tube at 20+ volt but as you might've known, tubes are not for low voltage run if u read the specs of tubes, all starting at 100v and above it will sound nicer at higher voltage as the designers believe

haha that's the expensive part like a black hole non stop rolling

SOHA's supply and MHHA or millet are different MHHA and millet use relatively low voltage (24 volt only rite?) SOHA needs 60v then 40v at plate, so we're using 15-0-15 trafo, then by using voltage doubler we can get 60v or thereabout. then just use RC network to filter off the ripples. for ur MHHA, it's simple aint it? if u can, just get some trafo with 28volt secondary, either 14-0-14 or just 0-28 then use LM317 regulate it down to 24 volt. and u're done with PS of course PS layout and scheme is as usual, which if not sure, you can chk with tangent's TREAD. either follow that, or you can choose to omit some things from there oh, you need to recalculate small things like resistors' values..

I think you might have a ground loop problem there you touched the ground part ? try resolder that part or errm change the ground wire to the star ground I cant test it out myself as I'm not using any RCA sockets yet

easy... how much are ur diodes rated for? that's the maximum continuous current handling

hmm this kinda mentality promotes the jacking up of prices well, up 2 u guys. ur money

just wait and see

planning stage collecting info on parts availability and pricing

14/35 = 40% haha it's not that easy to get locally either still have to go to the shop, instead of having it delivered to ur door step still have to waste time going to the shop still have to waste money, donating it to the already super duper rich sMRT or SBS or both

hmm... my 2 units of SOHA not giving buzz or hum at all I think you've misread it and no, we cant use batteries or DC output wallwart for SOHA errm, need AC to get the voltage doubler working

the tube? yea lol I've asked for quotes from frankie of well audio JJ will cost 35 dollars the mullard will cost 50 dollars so pick ur poison

eh wait ur buzz problem OK already? btw, saw ur post in headfi hahaha oh then have u properly set the plate voltage to 40v or thereabouts?