nikongod Posted November 4, 2014 Report Share Posted November 4, 2014 (edited) The JT attenuator has a constant output impedance to make it work better as a passive preamp with cables longer than 6" . This is why the input impedance is "who knows." It is still kind of pointless here. There are Chinese alternatives with similar step size, and cheaper overall cost - just not constant output impedance that you dont need.... Edited November 4, 2014 by nikongod Quote Link to comment Share on other sites More sharing options...
UFN Posted November 4, 2014 Report Share Posted November 4, 2014 <snip> Here is what a stereo KGSSHV board looks fully populated. Lovely! Is it working as expected? Would love one of these as my next project //UFN Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 4, 2014 Report Share Posted November 4, 2014 There were some slight teething problems but the current layout has been fixed. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted November 4, 2014 Author Report Share Posted November 4, 2014 I don't think the JT has a constant output impedance. But I will analyze to make sure. My attenuator has both a constant input impedance and a constant output impedance. need to break the delete key on birgir's keyboard! Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 4, 2014 Report Share Posted November 4, 2014 More the undo... Quote Link to comment Share on other sites More sharing options...
nikongod Posted November 4, 2014 Report Share Posted November 4, 2014 I don't think the JT has a constant output impedance. But I will analyze to make sure. TPA says output impedance is constant 750ohm. Its pretty neat that they did it with only passives in the signal path, but there are equally good cheaper things to build into an amp. Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 25, 2014 Report Share Posted November 25, 2014 Something new emerged last night.... Does look kinda cool in black. 4 Quote Link to comment Share on other sites More sharing options...
Torpedo Posted November 25, 2014 Report Share Posted November 25, 2014 Yup, I like it a lot. I've always liked better black audio equipment. Quote Link to comment Share on other sites More sharing options...
Ali-Pacha Posted November 25, 2014 Report Share Posted November 25, 2014 (edited) Something new emerged last night.... Does look kinda cool in black. This, I love. Ali Edited November 25, 2014 by Ali-Pacha Quote Link to comment Share on other sites More sharing options...
nopants Posted November 25, 2014 Report Share Posted November 25, 2014 I've always thought your amplifiers should have acrylic or something to that effect on top, since it's a waste to cover up all the tidy internal wiring Quote Link to comment Share on other sites More sharing options...
wink Posted November 26, 2014 Report Share Posted November 26, 2014 The heat dissipation considerations alone are worthy of emulation. Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted November 26, 2014 Report Share Posted November 26, 2014 Wow, I really like that amp, Birgir. Quote Link to comment Share on other sites More sharing options...
blessingx Posted November 26, 2014 Report Share Posted November 26, 2014 ^ What they said. Quote Link to comment Share on other sites More sharing options...
Kerry Posted November 26, 2014 Report Share Posted November 26, 2014 Nice work as always! I was enjoying the white faceplate, but this has such a bad boy look Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 26, 2014 Report Share Posted November 26, 2014 (edited) Thanks. The black panels are an extra headache to work on but I like a challenge. It's a bit nuts to think about but I've built 20 mini KGSSHV's at this point in three different sizes... That's in about 6 months or so. I've always thought your amplifiers should have acrylic or something to that effect on top, since it's a waste to cover up all the tidy internal wiring If I ever send an amp to a show of any kind then it will have a lexan top panel. Heavily ventilated naturally but it would be a nice fuck you to those who hide the internals. Edited November 26, 2014 by spritzer Quote Link to comment Share on other sites More sharing options...
UFN Posted November 26, 2014 Report Share Posted November 26, 2014 I'll of course join the choir and say "excellent work" If I ever send an amp to a show of any kind then it will have a lexan top panel. Heavily ventilated naturally but it would be a nice fuck you to those who hide the internals. Speaking of which, can we see some topless pics of her Spritzer? //UFN Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 26, 2014 Report Share Posted November 26, 2014 She's a classy lady so she said no but her baby sister was ok with it... These two cousins are simply waiting on screws to secure the XLR sockets... Bigger sinks so MOAR CURRENTZ 3 Quote Link to comment Share on other sites More sharing options...
nopants Posted November 26, 2014 Report Share Posted November 26, 2014 Where do you get those feet, are they included with the case? I'm digging the trim on the faceplate Quote Link to comment Share on other sites More sharing options...
spritzer Posted November 27, 2014 Report Share Posted November 27, 2014 The feet are off ebay but not the ones I actually ordered. Gotta love ebay for shit like that... Quote Link to comment Share on other sites More sharing options...
UFN Posted November 27, 2014 Report Share Posted November 27, 2014 The feet are off ebay but not the ones I actually ordered. Gotta love ebay for shit like that... Yep, if you want to be sent something else than what you actually ordered, ebay is the place to go //UFN Quote Link to comment Share on other sites More sharing options...
nopants Posted December 6, 2014 Report Share Posted December 6, 2014 (edited) For those of you who are lazy, or as we like to call it in the industry, efficient, the KGSSHV works with the KGST's BH power supply @ 350V. I'm doing some duration testing right now but there seems to be enough adjustment range on the pot to get down to 0V. After it's warmed up it settles to around 15-18V, no servo. Might be enough for me to leave it. Also pretty lukewarm heatsinks, reminds me off the vanilla offboard build. Edited December 6, 2014 by nopants Quote Link to comment Share on other sites More sharing options...
spritzer Posted December 6, 2014 Report Share Posted December 6, 2014 That is pretty much the PSU the mini HV uses and all the older KGSS amps. Quote Link to comment Share on other sites More sharing options...
nopants Posted December 6, 2014 Report Share Posted December 6, 2014 (edited) Yeah I might just case the amp boards separately from the psu so I can swap between the hv and st without buying more parts. It sounds great but reading some asswipes comments on headfi about how it's the greatest thing since sliced bread is really detracting from my experience, fairly petty of me Edited December 6, 2014 by nopants Quote Link to comment Share on other sites More sharing options...
wink Posted December 6, 2014 Report Share Posted December 6, 2014 Go easy on that crowd. Anything above a Starving Sudent is considered real exotica. The O2 (NWAVGUY's creation) still draws hushed gasps of awe from some. Quote Link to comment Share on other sites More sharing options...
astrostar59 Posted December 7, 2014 Report Share Posted December 7, 2014 A question for Kevin or Spritzer I read there was an extensive mod to the 727 that included boards out and transistor swops, and was set out by Kevin. Have you a link to the post please, I can't find it. Did it succeed in bringing the 727 close to a KGSShv i.e. a big jump in sound quality, or was it just bringing it closer to the older 717? Thanks in advance guys, I know you are busy on multiple projects! Quote Link to comment Share on other sites More sharing options...
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