siriuz

toner

@kube: i was thinking to leave at 4pm after the talk by electrical and electronic engineering, but i think i'll sit through media and info comm, then meet you? i think this friday we head down to koba instead, you want to get all the parts and the amp parts also right? i didnt see any tube sockets at slt today actually i bought ferric chloride and blank double sided pcbs today. wanted to surprise you guys

yea bell electronics

yea i know can make with 4 diodes. i'll be going down to sls prolly this friday after SP career fair, so its ok =P i'm in no hurry, since the tubes aren't here yet. i was thinking 3VA like very weird leh, i do some mental calcs turn out like only around 0.1A. so i dunno why it write 0.3A. so i bought the 6VA one lor

oops! i think i getting senile slt become sls. then i forgot buy bridge rectifier. win liao! trafo is 6VA 15-0-15 , $4.30. i saw one 3VA one, say 0.3A. but then i see like so small, so i buy 6VA one

oops i forgot about da blok but nvm la hahaha i got the parts liao. total about $15 for the psu. i intend to use IEC socket for connecting, then can use the same power cables as computer. the sockets can get at sls most shops. koba should have also. i couldnt seem to find 11k resistor in sls so i got 2 x 22k to parallel instead. heater is powered by the ps, but its part of the tube. two of the pins on the tube, its not a separate unit.

oh ok! i thought it'd be getting the full 30v i mean, i'll be putting it together with the amp side because it'll be on the amp board. it'll still be tapped from the heater supply. yes i want a mean blue glow lighting up my tube

because of this review http://www.sgheadphones.net/index.php?show...indpost&p=60605

i going down to sls tmr to get the parts for the psu section, will finish psu section tmr, then wait until tubes arrive then i work on the other part. heres the parts list i've worked out for the psu section: 4 x 100uf 100v electrolytic caps 3 x 470uf 35v electrolytic caps 3 x 47uf 16v electrolytic caps 2 x rectifier bridges 2 x 1N4002 diodes 1 x 15-0-15 200mA transformer 1 x 7812 12v regulator 1 x 7912 -12v regulator 1 x LM337 regulator 1 x 2W TO-220 heatsink (for LM337) 1 x 2k2 resistor 1 x 1k3 resistor 1 x 11k resistor the 470uf caps i was thinking 35v abit low since 30v x 1.41 is 42.3v so i'll probably get 50v ones instead, dont think they'll cost alot more and it wont hurt either if you're wondering where the RLED and the LED went, i decided to put it in the amp section if there are any mistakes in the parts list please let me know

i didnt realise that was a sticky either ! i found it on google LOL

yea from what i've seen of the pictures and what i've heard in the thread, both squalle and kippei using "stripboard". not really "stripboard" since the traces are not strips? i think they're using perfboard / veroboard / <insert variant here>. i dont think its really that complicated if you lay it out nicely on paper first =P since it intrigues you, why not try it?

yea the tubes would be for the SOHA. yes its too late since there are only 3 tubes in the lot

hey squalle, you asked why NOS tubes were preferred? i came across this tube FAQ on headfi during some googling read the whole FAQ here: http://www4.head-fi.org/forums/showthread.php?t=121357

@kippei: this guy seems to be selling the tubes for the millett for cheap http://www.diyforums.org/phpBB2/viewtopic.php?t=10

i have opa2134 left over from my cmoy2 experiments anyway i think i'll stick to +/- 12v regulators, dont really need the extra flexibility

oh ok i think i'll start laying out the psu later. many people seem to have hum issue and most of it seems to stem from trafo placement. so i think i'll have the psu and the amp unit on separate boards and possibly in separate cases

what did you guys use as the CCS for the SOHA? where to get the LND150 arh?

just hope no one bids higher

what do you guys think of this: http://cgi.ebay.com/5963-4-NOS-NIB-Vacuum-...1QQcmdZViewItem

i see.. i can't get the 2SK389 and 2SJ109 for the dynalo in singapore either, end up i get from dgardner together with my boards. they cost a (few) bomb(s)! usd10 a pair, and i need 4 pairs for my dynamid

can't get the tubes for the millet?

so many tubes, kippei want to start tube amp business in singapore arh

how does the RCA tube compare to the GE that you guys are taking ?

http://cgi.ebay.com/PAIR-GENERAL-ELECTRIC-...1QQcmdZViewItem this one leh ?

eh ? they're not the same ?