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, 201411 yr by nikongod

<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

There were some slight teething problems but the current layout has been fixed. 

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!

More the undo... 

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. 

Something new emerged last night.... 

 

 

Does look kinda cool in black. 

Yup, I like it a lot. I've always liked better black audio equipment.

Something new emerged last night.... 

 

 

Does look kinda cool in black. 

This, I love.

 

Ali

Edited November 25, 201411 yr by Ali-Pacha

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

The heat dissipation considerations alone are worthy of emulation.

Wow, I really like that amp, Birgir. 

^ What they said.

Nice work as always!

I was enjoying the white faceplate, but this has such a bad boy look

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, 201411 yr by spritzer

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

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

Where do you get those feet, are they included with the case? I'm digging the trim on the faceplate

The feet are off ebay but not the ones I actually ordered.  Gotta love ebay for shit like that... 

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

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, 201411 yr by nopants

That is pretty much the PSU the mini HV uses and all the older KGSS amps. 

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, 201411 yr by nopants

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.

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!