[tangent]

Just this little thing I whipped up...

Panel by FPE, knob by DACT, chassis by PAR Metals.

...and inside:

Left front, a DACT CT-2. On the board, OPA637/627s driving Glassman v3 buffers. Power supply...no, it isn't a STEPS.

 

[thrice]

Nice looking PPA tangent!!! What color is the led on the Bass Boost switch?

 

[GWN]

Nice work.

Question though.
You've got AC ground going from the IEC to a bolt in the rear panel of the chassis. Where does that other ground wire attached to the bolt go to. It appears to be going to the RCA's (Signal ground) ??

 

[gastro54]

mmm, DACT... I wish it were cheaper

very nice PPA

 

[rayofsi]

so how does glassmans buffers sounds

?

 

[MisterX]

Nicely done.
What are the switches?
Cannons?

 

[tangent]

Quote:

What color is the led

There is no LED there. Without making an electronic switching circuit, there is no way to turn on an LED when the bass boost is enabled. You could manage it if there were a 3PDT version of the switch by taking over one of the poles, but no dice...

That's one reason I chose to put a blue lens on the power switch even though the LED is also blue. It keeps the expectation that one is always blue and the other always stays white.

Quote:

Where does that other ground wire attached to the bolt go to.

Input ground, by way of a 10 ohms 5W resistor. That's the white block you can see below the jacks.

It's necessary because the attenuator chassis is connected to the case and thereby to AC ground, so there needs to be an indirect connection to signal ground to prevent a ground loop. Instead of doing that, I could have insulated the pot from the case and grounded it to input ground on the board. There's no compelling reason to do it the way I did it; I just didn't have the right insulating washers on hand for this attenuator, but I did have the resistor.

Quote:

I wish it were cheaper

What price snob appeal?

Quote:

how does glassmans buffers sounds

It's too early to say anything more than that I like them better than a set of 5002s.

 

[tangent]

Quote:

What are the switches?

NKK KB series.

 

[Sovkiller]

Quote:

Originally Posted by tangent Input ground, by way of a 10 ohms 5W resistor. That's the white block you can see below the jacks. It's necessary because the attenuator chassis is connected to the case and thereby to AC ground, so there needs to be an indirect connection to signal ground to prevent a ground loop. Instead of doing that, I could have insulated the pot from the case and grounded it to input ground on the board. There's no compelling reason to do it the way I did it; I just didn't have the right insulating washers on hand for this attenuator, but I did have the resistor.

And why not better isolating the AC ground form the case???

 

[00940]

Quote:

Originally Posted by tangent Power supply...no, it isn't a STEPS.

So the "real" ppa PS is coming ?

Very nice beast btw.

 

[tangent]

Quote:

why not better isolating the AC ground form the case???

Because I don't want to be electrocuted if there is a supply short to ground.

Quote:

So the "real" ppa PS is coming ?

Could be, could be.

 

[digi01]

nice work,as always.

congratulations

 

[morsel]

Studly amp, Tangent. Looking forward to hearing more details about those Glassman buffers.

Quote:

So the "real" ppa PS is coming?

There is no "real" PPA PS, although Tangent's STEPS is a good and convenient supply to use if you want something better than an Elpac wallwart. It sounds like Tangent has been working on a new PS, but that is his project.

 

[Glassman]

Quote:

Originally Posted by tangent ..I like them better than a set of 5002s.

thanks, seems like design goal reached

I'll second Christina, looking forward to some more in-depth review of them

 

[Garbz]

very sexy.

What case is that, and how much did it cost. Also how did u get the text etc on the front pannel?

I need a case for my gilmore before i electrocute myself.