Jer's 400 PLWO Thread

[jbeckva]

Bugger! I keep on binding up that meter.. grr..

Well anywhoo.. here's the latest, with switch!

 

[laatsch55]

What is taped to the back of it??

 

[jbeckva]

What is taped to the back of it??

That's the support for the transformer while she's on her back.. temporary til I'm fully done..

 

[laatsch55]

Tricky!!!

 

[NavLinear]

That's the support for the transformer while she's on her back.. temporary til I'm fully done..

Damn dude - taping 'em while they're on their backs - what's next??

 

[jbeckva]

Damn dude - taping 'em while they're on their backs - what's next??

LOL.. how about shaking schtuff off the walls and shelves? This as as far as I can stand it without going into defib...

 

[jbeckva]

UH OH.. Now things are going to get real interesting....

 

[jbeckva]

UH OH.. Now things are going to get real interesting....

Yup... I think we're going to need a bigger UPS (this is from a 1500VA APC)

 

[laatsch55]

Which speakls to which amp???

 

[jbeckva]

Which speakls to which amp???

CV's on the 400, Polks on the 700. Polks are way less efficient so made sense to drive 'em with the big dawg.

It was violent I tell ya! Had all sorts of shit coming off the shelves... cool!!

 

[laatsch55]

Wait till ya start breaking light bulbs and flatscreens....

 

[jbeckva]

Wait till ya start breaking light bulbs and flatscreens....

Don't want to go that extreme.. ears'll hurt first.

Guess what drivers I just put in, with NO problems?? I figured it'll work or it won't so what the heck. I like the sound of the 15024's with the 21194's instead of the 410's - Just seems clearer to me.

meters still fubard... I'll take another stab at those another day.

 

[Gepetto]

Don't want to go that extreme.. ears'll hurt first.

Guess what drivers I just put in, with NO problems?? I figured it'll work or it won't so what the heck. I like the sound of the 15024's with the 21194's instead of the 410's - Just seems clearer to me.

meters still fubard... I'll take another stab at those another day.

Check for oscillation on the lower half Jer, you will not hear it but you can see it on the scope. That is a risky combination, 2 poles at the same frequency in that configuration. The oscillation will be in the high 100s of KHz range and may break out sporadically.

 

[laatsch55]

What 2 poles???

 

[jbeckva]

Check for oscillation on the lower half Jer, you will not hear it but you can see it on the scope. That is a risky combination, 2 poles at the same frequency in that configuration. The oscillation will be in the high 100s of KHz range and may break out sporadically.

15Khz signal, 5 volts per division. I actually had more issues with the 410's, at least in the 700 I did.

 

[Gepetto]

What 2 poles???

2 transistors with identical Ft contributing to the phase lag rolling off the gain in the lower local feedback loop...
Q7 derives feedback from Q12 and Q14/16/18

 

[Gepetto]

You won't see it on a signal that big Jer. If it materializes, you will see it on a signal of a volt or 2. A square wave input will show it up as ringing on the negative half

 

[jbeckva]

You won't see it on a signal that big Jer. If it materializes, you will see it on a signal of a volt or 2. A square wave input will show it up as ringing on the negative half

Thanks. Well I didn't see so much ringing as I did overshoot, and it was definitely better on the 700 so it's not the input signal. But the overshoot is on both halves.. nothing different on the negative half, Joe.

I'll get the 410's back in and see what difference there is. What else besides the 410's can I use that won't cause this?

 

[laatsch55]

Mj 2741's, MJ 1800, .... I was always wanting to try a 2N5039.

 

[laatsch55]

Throw some 909's on there...