Przem's Phase Linear 700 Series II White Oak Conversion

[fitz43]

but those 100 volt DC pads are close enough to the edge as it is and then have that distance lees AND then the board touching the chassis doesn't seem like a long term, trouble free option....

Need more nomex paper?

 

[Gepetto]

Need more nomex paper?

Lee is still fine, almost all of the design setback is still intact. You can see that in a photo he sent me.

 

[laatsch55]

IT LIVES!!!!!!!!!!!!!!!!!!

And the pic Joe mentioned. The standoff moved about a 1/32nd.

 

[laatsch55]

I kinda like the cylon look....

 

[laatsch55]

Appreciate the thought Doug....

 

[laatsch55]

Bobby picked a good night to be here to space goat it!!! He's digging it...

 

[laatsch55]

The 700's go Mach 9 so effortlessly!!.....God I love em!!!

 

[laatsch55]

Przem if you are still nervous about the backplanes....remember they're guaranteed for life...and in this case I'll pay shipping to and from if it goes tits up, cause after the week it's gonna live through here it'll be fine if it lives....

 

[laatsch55]

The aftermath...

 

[laatsch55]

Ok, I nFINALLY got what I wanted when routing the wires....the AC going to the meters are in a separate bundle..where they cross the low signal shielded near the meters they are at right angles. The shielded also routes in space away from everything....this one is QUIET!! We'll put it on the AP tomorrow...it sounds incredible though ...shold test very well..

 

[laatsch55]

There's a guy in Texas that wouldn't believe how quiet this amp is...

 

[laatsch55]

Przem it sounds incredible and VERY quiet...Jani loves it, and her ear is pretty picky...

 

[laatsch55]

I notice the meters peg pretty early...will have to adjust those...the the meter glass cleaned up nice Przem...

 

[laatsch55]

fAR AS i KNOW, YOU feed it a known strenght signal and adjust the meter pot to read correctly on the face. I haven't read through the procedure completely yet but I bet that's close..

 

[laatsch55]

Manual says to drive the inputs with a 60hz sine wave to get 54 vrms at the out put and adjust the meters to read 0db on the meter scale...

 

[gadget73]

yeah, setting the meters is simple. There is a second part of it where you push the amp into clipping to verify that the clip indicators work, and then you drop it down 20db and verify that both meters agree. You don't need a load on it either, just a voltmeter and/or a scope.

For what its worth, both the 700-II and my Pro with the same meter board had no issues with the clip indicator or the -20db agreement.

The wiring in that looks worlds better than the stock wiring. Just out of curiosity, has anyone done noise measurements of a stock one, then again after making the wiring less of a Charlie Foxtrot with stock boards and such? Makes me wonder if there is not room for improvement just by making the wiring less messy than it left the factory. The AC mains wiring in particular seems very poorly done.

 

[laatsch55]

On almost every amp I've done since I got the AP analyzer I've done before and after residual noise measurements. Big difference in noise level..Some improvement by way of the improved grounding scheme ands some by way of the backplanes and driver boards..

I've had some in the before measurement in the 1-2 MILLIVOLT range and afterwards they'll be in the 100-200 MICROVOLT range...

 

[Gepetto]

The aftermath...

Aw Jeez Lee, you said you were never going to clean things up and then you went and did it...

 

[laatsch55]

Shame on me Joe....A case of neat freak just TOOK OVER!!

 

[laatsch55]

Test time,,, Freq Res....