wink Posted October 9, 2014 Report Posted October 9, 2014 A meeting of the antipodean chapter of the Stax mafia?
justin Posted October 9, 2014 Report Posted October 9, 2014 http://www.audionote.co.uk/comp/cap_electro.shtml anyone looked into these caps yet? the newest ones not yet available
spritzer Posted October 9, 2014 Report Posted October 9, 2014 I'll check them out. If they are 105°C, with a decent load lifetime and indeed made by Rubycon this could be good.
kh90123 Posted October 10, 2014 Report Posted October 10, 2014 (edited) It's done. No music to be listened yet. Getting the SR-009 in 25 days, counting down. My biggest mistake in audio was to sell the SR-007 Mk1 that I had some time ago. I think I also used to have a SRM-T1 modded by Birgir. Unfortunately, there is like 2 unused switches at the back of the chassis to cover up some holes, and also 2 unused input jacks that were supposed to be RCA inputs. I chose to use XLR to RCA adapter instead. The big white switch at the back is also a 5A circuit breaker. 3 fuses for 100V, 115V and 230V mains voltage. Cable management still needs improvement. The Toroidy transformer is although pretty, too huge. Next time I won't get the stainless steel casing. No more explosion, no more arky sparky, bias is stable before the ballast resistor, at a voltage of 588V, offset and balance are all within 0.5V. I let it run for hours, then adjust offset and balance, then I put in the servo. Heartfelt thanks to Kevin, Victor, Birgir, Calvin, Kerry, and all those who aren't here but have helped me along the way. Kevin for his wisdom, Victor for his know-how, and Birgir for his support. It's has not been easy but lately things have gone very smooth after I learned a lot of skills and tricks from Victor. He helped me rebuild the PSU board, and along with that I learnt many things accumulated from his years of experience doing DIY. For eg, I learned to use screws with spring washers on heatsinks, then later I changed from zinc plated screws to stainless steel screws, along with ribbed washers. Zinc plated screws will stain and rust in a few years in this hot and humid tropical weather. This build was at first to be all IXYS 01N100D parts, then it went to having Toshiba 2sc4686a and IXYS CCS. Then after some mistakes and the traces were damaged on the amp board, it went from IXYS CCS to the Sanyo 2sa1968. At first I have like a few 1968. Now I have quite a few dozens lying around to build some stuff, after I got them for cheap from local sources. The end of one build will be the start of another. It's been fun, building my first amp, and my first DIY project. Out of nowhere, I suddenly found myself having quite some tubes, so maybe I will build a Megatron. Edited October 11, 2014 by kh90123
Kerry Posted October 10, 2014 Report Posted October 10, 2014 Nice build! Now just hang out and wait for the 009s. Enjoy:)
JoaMat Posted October 10, 2014 Report Posted October 10, 2014 Very well done indeed. Looking forward the Megatron.
eggil Posted October 13, 2014 Report Posted October 13, 2014 It is even sweeter when a difficult build comes to fruition. Congratulations!
bbest Posted October 19, 2014 Report Posted October 19, 2014 Hello all! Does anybody wanted to join to group buy of latest version of an off-board PCB, on-board PSU?
kevin gilmore Posted October 21, 2014 Author Report Posted October 21, 2014 (edited) updated power supply with the pnp's replaced with the stn9360 footprint in case you don't want to use the ksa1156 and 270v zener http://gilmore.chem.northwestern.edu/boards/kgsshvpsminifinalstn9360.zip Edited October 21, 2014 by kevin gilmore
PICaudio Posted October 21, 2014 Report Posted October 21, 2014 I think this link has a problem, I seen this error: "404 - File or directory not found The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable."
insanity Posted October 21, 2014 Report Posted October 21, 2014 The file can be found here: http://gilmore.chem.northwestern.edu/boards/ But I think this is not the correct file. There is no SOT223 package on the board.
kevin gilmore Posted October 21, 2014 Author Report Posted October 21, 2014 the pin spacing is right and you put the stn9360 vertical. first you straighten the pins. Same as the new T2 boards. works fine.
spritzer Posted October 21, 2014 Report Posted October 21, 2014 One label is incorrect but that's all. They are 2SA1486 in the - supply
alwayshungry Posted October 28, 2014 Report Posted October 28, 2014 Has anyone built their KGSSHV with a Joshua Tree attenuator? I'm wondering if I connecting it to one of the 16VAC secondaries would have any adverse effect on the amp. The JT doesn't use much power and it would save the trouble of installing another toroid. Thanks. Also does anyone have 20 PEEK screws they can sell me? 1
UFN Posted October 28, 2014 Report Posted October 28, 2014 Has anyone built their KGSSHV with a Joshua Tree attenuator? I'm wondering if I connecting it to one of the 16VAC secondaries would have any adverse effect on the amp. The JT doesn't use much power and it would save the trouble of installing another toroid. Thanks. Well, based on TPA's published specs I can't see that that should be a problem. //UFN
GeorgeP Posted October 28, 2014 Report Posted October 28, 2014 I seem to remember reading there being an impedance issue with the JT. You might want to double check that it will work from that perspective.
kevin gilmore Posted October 28, 2014 Author Report Posted October 28, 2014 the JT attenuator is not constant impedance. There was absolutely no reason why it could not have been constant impedance. Other than that I think it should work if it does not overload the transformer.
spritzer Posted November 4, 2014 Report Posted November 4, 2014 Here is what a stereo KGSSHV board looks fully populated. 1
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