[blubliss]

ignore list expanded

 

[jcx]

Quote:

Noise at full volume is usually fixed with 100 ohms in series with the wiper of the volume control.
To maintain full signal to noise, the volume control is usually a good idea. Then you turn up to
full blast the dac, and adjust the volume control for just past your maximum listening level.

a detail but noise from the 400 Ohms of source degen/feedback R is larger
 
and while many source may still work best with analog volume control the picture is changing
 
several DACs with >120 dB dynamic range are available now - for some of these it no longer makes any difference as long as 24 bit PCM is driving the DAC - and even Windows can now be set for 24 bit output even with 16 bit source: the digital volume control math quantization at 24 bits output is way below any electronics noise floor
 
and headphone listening doesn't reach the 0 dB SPL anechoic chamber threshold due to mechanical motion "microphonics"
 
since ES headphones can't reach 120 SPL, hearing noise floor with headphones on is ~ 10 dB SPL then we really don't even "need" 120 dB dynamic range with good system gain structure

 

[El_Doug]

 

[Lil' Knight]

Neat

 

[gilency]

El_Doug, your amp is beautiful!

 

[spritzer]

Very nice indeed. 
 
I was doing some inventory and I found 3 KGSSHV transformers so I guess I'll have to get cracking on some more amps. 

  First we need to finish these two new volksamp projects though... 
 
Quote:

ignore list expanded

 
Been on mine for years but this was too stupid to ignore. 

 

[kevin gilmore]

Nice amp indeed, definitely like the back panel

Hopefully production Teflon stax jacks soon


Quote:

a detail but noise from the 400 Ohms of source degen/feedback R is larger

 
I was referring to the noise some dac's make when they drive the input capacitance of the jfet directly
with no series resistance. Reading HDman's comments now, i think he was talking about something else.

 

[verwandlung]

Quote:

 

This looks very nice, refined, sober, with the name on the back! How many of them are you planning to build again?

 

[El_Doug]

Thanks for your kind words, everyone!  There actually will be a "KGSSHV" on the front, it is on the faceplate of the power supply (same size box).  However, just like the amp, the PSU front panel will be covered with black enamel and a matte clearcoat (just primed it tonight, actually) - thus the engraved "KGSSHV" will appear as a textured relief, but will not be a different color. 
 
It'll look even better once I get my wife to use her camera + photography skills, instead of my point-and-shoot technique with my cell phone

 

[J-Pak]

Quote:

Thanks for your kind words, everyone!  There actually will be a "KGSSHV" on the front, it is on the faceplate of the power supply (same size box).  However, just like the amp, the PSU front panel will be covered with black enamel and a matte clearcoat (just primed it tonight, actually) - thus the engraved "KGSSHV" will appear as a textured relief, but will not be a different color. 
 
It'll look even better once I get my wife to use her camera + photography skills, instead of my point-and-shoot technique with my cell phone

 
Is this an onboard or offboard build? Pics of the insides too please

 

[El_Doug]

Quote:

 
Is this an onboard or offboard build? Pics of the insides too please

 
offboard, of course  
 

 

[J-Pak]

Quote:

 
offboard, of course  
 
 

 
Very nice, what relay switching board are you using for the input selection?

 

[kevin gilmore]

I like it even more after that last picture.

 

[chinsettawong]

Very nicely done.  Wow!  

 

[Victor Chew]

Very nice . Any PS pictures?