spritzer Posted March 3, 2013 Report Posted March 3, 2013 In related news I'm working out the details to make a tiny KGSSHV. The box is only about 15*10*25cm so I have to use a BH power supply as even my tiny HV supply won't fit. With 500V caps I should be able to do 440V or something like that.
RiStaR Posted March 3, 2013 Report Posted March 3, 2013 That sounds great. Do share when you're done, I might be able to get rid of the 252 for the PC with this At the same time, I've gone through this whole thread a second time and can I just verify that it's okay to just use thermal paste for the 15V regulators 7815/7915? I know the 4684A doesn't need the aluminum oxide insulators, just want to check on the 7815/7915s. In related news I'm working out the details to make a tiny KGSSHV. The box is only about 15*10*25cm so I have to use a BH power supply as even my tiny HV supply won't fit. With 500V caps I should be able to do 440V or something like that.
spritzer Posted March 3, 2013 Report Posted March 3, 2013 (edited) If you use the isolated parts then thermal paste would be fine but you need to insulate the bare metal tabs. No way around that... Here is the same chassis I'll be using for the mini HV: This is a Hiraga Le Monste being test fitted to see just how hot it gets. The regulators get burning hot so I'll probably relocate them to the side sinks and add servo's, Nice transformer hum as well... Edited March 3, 2013 by spritzer
RiStaR Posted March 3, 2013 Report Posted March 3, 2013 Wow! That's tiny! How does it sound? Not tinny, I hope If you use the isolated parts then thermal paste would be fine but you need to insulate the bare metal tabs. No way around that... Here is the same chassis I'll be using for the mini HV: This is a Hiraga Le Monste being test fitted to see just how hot it gets. The regulators get burning hot so I'll probably relocate them to the side sinks and add servo's, Nice transformer hum as well...
chinsettawong Posted March 3, 2013 Report Posted March 3, 2013 (edited) Mini size high volt supply is just what I need. Wachara C. Edited March 3, 2013 by chinsettawong
Valentin Hogea Posted March 3, 2013 Report Posted March 3, 2013 Regarding the unpopulated parts on the new boards... Someone mind giving a newbie an explanation the differences between the different servo types and what values/tolerances they should have? Thx, V
drp Posted March 3, 2013 Report Posted March 3, 2013 In related news I'm working out the details to make a tiny KGSSHV. The box is only about 15*10*25cm so I have to use a BH power supply as even my tiny HV supply won't fit. With 500V caps I should be able to do 440V or something like that. Also mucho interested in this one. Space constraints is why I went with the 727II and constantly looking for tweaks to improve performance.
Kerry Posted March 4, 2013 Report Posted March 4, 2013 Big sound... small chassis... Looking forward to seeing the results.
jwzhan Posted March 4, 2013 Report Posted March 4, 2013 Definately interested if it can out perform all the stax amps currently in production (which I'm sure it will.)
eggil Posted March 4, 2013 Report Posted March 4, 2013 (edited) Mmmmmhhh...... And I thought the Megatron was going to be next. But you certainly got my attention! Edited March 4, 2013 by eggil
spritzer Posted March 4, 2013 Report Posted March 4, 2013 What can I say, I like small amps and all the problems they bring... First up is to unfuck this Icepower amp and get this Le Monstre working at reasonable temps..
justin Posted March 6, 2013 Report Posted March 6, 2013 Have had 50 of these for a while, just tested. 1050-1100V Sent from my iPhone using Tapatalk
livewire Posted March 6, 2013 Report Posted March 6, 2013 Justin have you found a decent source for 2SA1486 sand? (other than B&D)
eggil Posted March 6, 2013 Report Posted March 6, 2013 Just let us know when you are ready to sell them. At the price you quoted before, I'd take 100.
s_r Posted March 6, 2013 Report Posted March 6, 2013 Interested in those 1486's as well (would beat paying $35 for ten pieces on bdent). Also, is there another source for 2SC4686A's? Bdent's stock is apparently out. They were in stock when I checked about a week ago (really should have bought some then).
spritzer Posted March 6, 2013 Report Posted March 6, 2013 Story of the tiny chassis continues: Moved the regulators and swapped out the 3300uf main PSU caps for 33000uf. I also added servo's to the amp boards (modified version of the Dynalo/KG servo) to keep the offset in check. I'm using TL072's now as there were some just sitting on my desk but I'll probably put in some OPA27's. ImageUploadedByTapatalk1362550397.809368.jpg Have had 50 of these for a while, just tested. 1050-1100V Sent from my iPhone using Tapatalk I have some of those on the left. Bought from a local store so European origin probably...
spritzer Posted March 7, 2013 Report Posted March 7, 2013 ...and it's pretty much done. Runs very hot, front panel at 60°C after an hour. Hardly surprising given 0.8A@12V times four plus the regulators. I need some new resistors...
Pirx Posted March 8, 2013 Report Posted March 8, 2013 ...and it's pretty much done. ......Runs very hot, front panel at 60°C after an hour. Hardly surprising given 0.8A@12V times four plus the regulators. I need some new resistors... Nice build and it should sound very warm I guess Arctic version?
c12mech Posted March 8, 2013 Report Posted March 8, 2013 And they wonder why the ice caps are melting. It's all Birgir's fault with things such as this:)
spritzer Posted March 8, 2013 Report Posted March 8, 2013 Pffft, glaciers are overrated anyway... This was done on purpose though to see if the box could dissipate 50W so I would know how hard I can push the KGSSHV in the same chassis. I will change this one though as the PSU caps will not last long at 60+°C. I just don't have any non inductive resistors in these very low values.
jwzhan Posted March 15, 2013 Report Posted March 15, 2013 I just found thirteen 2sc4686A that I thought I lost due to misplacement... Made me a very happy man... Pure Silicon Gold.
kevin gilmore Posted March 16, 2013 Author Report Posted March 16, 2013 for the next board run http://gilmore.chem.northwestern.edu/kgsshvps8g.jpg
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