Gibsonian's Cherry Pl 700 Ser I, soon to be a PLWO-1000

[laatsch55]

WOPL 1000 BACK IN DA HOUSE!!!! Cathy :LIVES!!! Results in a bit!!

 

[laatsch55]

Frequency Response, as expected....

 

[laatsch55]

Other stuff....

 

[Gibsonian]

Very healthy looking stats. Can't get much flatter than that freq response!

 

[laatsch55]

Amen Scott, check this out!! THD & N....

 

[laatsch55]

To see what contributors were to the THD & N , I ran a spectrum analysis ssweep. I posted the appropriate page from the AP Manual. What I don't know for sure is if I have turned off the fundamental frequency by shutting off the generator and does that shut down the whole generator. I can't seem to find that piece of info. From the sweep graph it appears I captured some data, but is it relevant??

 

[Gibsonian]

To see what contributors were to the THD & N , I ran a spectrum analysis ssweep. I posted the appropriate page from the AP Manual. What I don't know for sure is if I have turned off the fundamental frequency by shutting off the generator and does that shut down the whole generator. I can't seem to find that piece of info. From the sweep graph it appears I captured some data, but is it relevant??

Dunno. After reading explanation it would seem source of noise would be considered random, no specific source to explain it.

 

[jbeckva]

The procedure is now in the PLWO Hints and Archive section on the forum.

The posts you speak of... left and right channel (+), right?

 

[Gepetto]

Yes, Jer, correct.

 

[Gepetto]

Dunno. After reading explanation it would seem source of noise would be considered random, no specific source to explain it.

60 Hz AC line and harmonics definitely show up. 60, 120, 240, etc

 

[laatsch55]

That was my conclusion Joe. Seems to be the major factor, with distortion playing a very minor role, 60 Hz hum and it's multiples...

 

[laatsch55]

More stuff...

 

[laatsch55]

More THD & N/.....

 

[Gibsonian]

More THD & N/.....

A and B channels are sure quite different in THD and noise. Any idea why?

 

[laatsch55]

Trying to find that out right now Scott.

 

[Gepetto]

try swapping the AP input/output channels and see if it follows that or not. Always rule out instrumentation first.

 

[laatsch55]

Enough that I built new cables, should have a handle on it a little later here.

 

[laatsch55]

WTYF< WTF< WTF??????????

 

[laatsch55]

Nothing changed but the cables. Nw ones made out of 30 year old microphone cable....

 

[laatsch55]

Life is good. Time to mate up Cathy with some good time horns......!!!!!!!!!!!