[mattcalf]

Gonna offer that one on ebay fred?

 

[Fred_fred2004]

Not a chance! I'll leave the tubes to the chinese sellers

 
cheers
FRED

 

[Avro_Arrow]

Fred, throw a 300uF to 600uF cap across R102 and see how much better it sounds...

 

[n_maher]

Quote:

So pretty, but c'mon - light that puppy up already... such pretty work. Were that I had that type patience on a build (and no, pending design disasters do not count as patience, no matter how many YEARS they take).  

 
 

If all goes well I'll flip the switch some time late tonight.  The inputs are pretty much wired now, just need to do the outputs and then it'll be time to run through the initial setup on 120VAC and then break out the variac and see if the international plan actually works.

 

[Rescue Toaster]

Little experiment.
 

 
According to rightmark the noise floor is really high, I believe the gas discharge tube needs a bypass cap, I just have to dig out one of my old russian teflon 0.056uF's. Also the 120Hz is poking out of the noise floor as well, so I might need another LC stage, or OPT needs to be farther from the choke. The Hammond 193L is doing fantastic in choke-input duty, no mechanical hum at all.
 
But, for mono, sounds pretty good. I tried some old Edcor XSM 10K:600's to do some preamp duty testing for rightmark, and they didn't measure very good at all. But the custom XSM 10K:38's that I had them make for phones measure extremely flat. First harmonics are at least -70db, can't tell the others due to the noise atm.

 

[bidoux]

Actively loaded and active ground ?

 

[Rescue Toaster]

The supply is split +147/-86, ground is just a reference voltage set by CCS-loaded gas discharge tube, and I might replace that with a simple resistive divider if I can't quiet down the discharge tube. But they are so pretty!
 
It is differential push-pull. The XSM 10K:38 carries ~23ma per side.

 

[Pageygeeza]

Rescue Toaster:  That thing exudes evilness!

 

[n_maher]

Just for Al, so he'll get off my back.
 




 

 
I got about 45 minutes of listening time tonight and I like what I'm hearing.

 

[dBel84]

that looks great Nate ..dB

 

[sachu]

That's tight Nate..As clean a build as they come.

 

[T.B.N.]

Quote:

Just for Al, so he'll get off my back.
 



 
 
 
 
I got about 45 minutes of listening time tonight and I like what I'm hearing.

Is that a Par-Metal case? Most of the ones I saw didn't look so great to me but that seems to change my opinion, looks nice!

 

[balderon]

Yes I would say it is. The Bijou in my sig is also a Par-Metal case with over the top bling.

 

[uberburger101]

Wow. That's a real work of art.

 

[tamu]

I love it Nate. I wish I had designer skills like some of you guys too