The Phase Linear 400 Guinea Pig

Do you want to simulate a blown fuse , or push and see if it goes?
 
laatsch55 said:
Well yeah, right now. You're calling down changes and I'm makin em. It seems the only way to see if that was a cure is to duplicate the push.

R35 in. got a little rough with Q7R last time and ripped the base trace, thank goodness that doesn't see much. Managed to get a small sliver back in the hole and a good solid solder job.
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It looks like you're out of transistor standoffs Lee. I'm guessing if I came up with more you'd use them?
 
No Dennis I'm fine there, had to leave that one out to fix a brooken trace I ripped when I got a little horsey with it. Should have sucked it one more time. And this board I put together before I got the standoffs.
 
I'm losing the positive rail fuse at 240 watts at 8 ohms. Did it twice. The minus rail fuse does not look stressed. It did not take out the pico fuse, either one.
 
laatsch55 said:
I'm losing the positive rail fuse at 240 watts at 8 ohms. Did it twice. The minus rail fuse does not look stressed. It did not take out the pico fuse, either one.
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That looks like progress of a sort Lee. You wanna come halfway back on R35 to 10 ohms instead of 22? Was it a 5A AGX fuse on the topside that went?
 
laatsch55 said:
I'm losing the positive rail fuse at 240 watts at 8 ohms. Did it twice. The minus rail fuse does not look stressed. It did not take out the pico fuse, either one.
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That is about spot on where a 5A fuse should blow Lee with you pulling 240W x 2 channels into 8 ohms.
 
Made it to just over 210 this time when something else gave. No pico fuse gone, no rail fuse gone. +5.632 vots DC on the speaker outs. Back o the bench...
 
I'm showing some leak between the C-E jct on Q7R/L. Let me get em pulled and checked.
 
Still haven't found the problem, got a funny acting R2, but I don't think that's it.
 
Gepetto said:
That is about spot on where a 5A fuse should blow Lee with you pulling 240W x 2 channels into 8 ohms.
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Joe, how the heck am I running 8A fuses and not destroying things inside then???? The amp's heat protections trip instead. I am lost on all this, I know I am pushing max power, needles are buried flat usually when I am playing my guitar along with it. Tweeter protections usually kick in before the heat protections trip though

I need me some edumacation
 
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