Jason's Phase Linear P3600

[laatsch55]

Just that quick...

 

[laatsch55]

Got correct power supply voltages accross all op-amps, +14.2, -14.1 Missing some gain. Max out is 450mv, should be north of 2 volts..

 

[laatsch55]

FR curve...


Nav, Joe, or Jer, to fix this response I would have to take C106,206 to .68uf, correct?

 

[laatsch55]

Minimum input level for rated output is 150mv, I only had 40mv. Rated output is now 2.1 volts... Distortion sweep coming up...

 

[laatsch55]

Everything is groovy except for the bass response....it would be nice to have the FR curves match the amp. The amp will not do 10hz if the pre-amp won't....

 

[NavLinear]

Minimum input level for rated output is 150mv, I only had 40mv. Rated output is now 2.1 volts... Distortion sweep coming up...

Did you swap out the caps? What was loading down the input voltage to the opamp?

 

[NavLinear]

Everything is groovy except for the bass response....it would be nice to have the FR curves match the amp. The amp will not do 10hz if the pre-amp won't....

What did the 3300 II do at the low end? If you could flatten our the bottom end that be would awsome. I'm assuming that's why you were asking about the cap value change.

 

[Gepetto]

I've got the bypass caps accross pins 1,5 instead of 4, 8. For the first problem...

Ooops!

That will hurt things.

 

[Gepetto]

FR curve...


Nav, Joe, or Jer, to fix this response I would have to take C106,206 to .68uf, correct?

First had to flip the schematic over, was getting a stiff neck

Yes C106 at least 0.33uF and C107 to 47uF with a 0.15uF film bypass across it as well.

Those appear to be the frequency response bottlenecks.

 

[laatsch55]

both of ya!! THD & N coming up. Things look great if we could get the low end fixed up. Yes Nav, that's the one. Love ya ....both...

 

[laatsch55]

Ah Joe thanks!! I'll get right on that!! 22's to 47's with a bypass and thge .15 to a .33 could the .33 be mylar, may not have a .33 in poly.?

 

[Gepetto]

both of ya!! THD & N coming up. Things look great if we could get the low end fixed up. Yes Nav, that's the one. Love ya ....both...

Dyam, the PL700 power amp has better signal to noise than the pre does

 

[laatsch55]

Did you swap out the caps? What was loading down the input voltage to the opamp?

Uh........only 40mv input instaed of 150mv input...........dumas.........

 

[laatsch55]

Dyam, the PL700 power amp has better signal to noise than the pre does

Yep, wondered if you were going to notice that, but of course you would. Now you can puff up and go sideways Joe. out SNR'd a pre!!

 

[Gepetto]

Ah Joe thanks!! I'll get right on that!! 22's to 47's with a bypass and thge .15 to a .33 could the .33 be mylar, may not have a .33 in poly.?

Anything north of 0.33 up to 1uF in the C106 location should do Lee.

 

[laatsch55]

You know I have some 1uf film caps.....

 

[Gepetto]

Uh........only 40mv input instaed of 150mv input...........dumas.........

And unwanted feedback from a 180 bypass wasn't helping you either. Yeah I know what response I will get on this remark

 

[Gepetto]

You know I have some 1uf film caps.....

I happen to know that Lee...

 

[laatsch55]

Hookay, gimme 20 min and I;ll rerun the FR. This is the fun stuff!!

 

[Skynyrd77]

Very cool watching this go down!! A lot of very smart and cool ppl ... I love it