James Burke's (Jimmy) Phase Linear Ser I WOPL conversion UNIT # 2

[laatsch55]

Too bad you had to go through all of this Lee

Well, somebidy had to...hell, the Pig hasn't even got silver wire///

 

[laatsch55]

Looking good there Lee - under 200 microvolts of noise - that is a quite a goal.

I'll have some bias brackets ready Monday - the last batch were made with a tip that was too large. My words sometimes fall on deaf ears. Here's some shots of a tranistor pad if you're interested. I have a dozen or so of these made up.

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Dennis that's choice buddy. Send em on, they'll go in that 700B....

 

[NavLinear]

Dennis that's choice buddy. Send em on, they'll go in that 700B....

They're yours.

 

[NavLinear]

Soooooooo - have you guys locked into the RC values for the zobel network? I've done some reading regarding this and if you go to audio blogs information is all over the place. Seems that something close to 8 ohms for the resistance and somewhere in the neighborhood of 0.1 micro Farads for the cap is what I'm seeing.

 

[Skratch]

Nav, Does she take care of your horses???

 

[laatsch55]

Dennis , Joe and I were testing different Zoebels to verify what his Spice was saying. We found that 8.2 ohms, .22 uf was very good for stability, which is what the zoebel does, but not so good for high frequency distortion, so we went back to the .1uf/2-10ohm 3watters on parallel.

 

[laatsch55]

Gonna finish er up tonight ---all except R20L, R20R of course...

 

[Gepetto]

Waiting on a Mouser order Lee?

 

[laatsch55]

Yes Joe, not backordered, should be here tomorrow.

 

[laatsch55]

LOOK WHAT FOLLOWED ME HOME MOM,CAN I KEEP EM??

NOS, gotta love it!!!!!!!!!!!!!

 

[laatsch55]

And last but not least....

 

[laatsch55]

Joe, can I sub in a 1uf electro in R20 to test??

 

[laatsch55]

Done....

 

[Gepetto]

If you mean in C20 you don't need anything there to test it Lee unless you are going for a performance run. It is in parallel with C6 to cancel the ESR of that cap. It will run fine without C20 unless you are measuring on your AP.

 

[Gepetto]

Done....

Nice, I like those nice bright wire colors over the originals. Love that teflon insulation. No melting problems.

 

[laatsch55]

If you mean in C20 you don't need anything there to test it Lee unless you are going for a performance run. It is in parallel with C6 to cancel the ESR of that cap. It will run fine without C20 unless you are measuring on your AP.

Well, that's what I have is the AP. Go with the .01's ftom the C board??

 

[laatsch55]

Nice, I like those nice bright wire colors over the originals. Love that teflon insulation. No melting problems.

Oh yeah, I'm sold for as long as Nav can keep me in that stuff I'll be using it.

 

[laatsch55]

Powered up with the variac and DBT, no problems, bias is a joy to adjust now, DC offset----minus 9mv left channel, ---minus 11mv right channel...

 

[NavLinear]

Nav, Does she take care of your horses???

Oh no - she's better at other things!

 

[laatsch55]

Listening to it right now.... Joe, we may have broken that 200 microvolt barrier with this one. Can not hear a thing from infinity on the Spec 1 to 0 db, absolutely nothing. Listening to Patricia, the absence of background noise makes it seem like you are there. Lean back and close your eyes.....and you are....
I believe this may e the quietest ine yet. In 3 days we'll know. But my ears haved confirmed it already. Damn, this is sweet!!!!!!!!!!!!!!!