My PL 400a Control Board Kit

laatsch55 said:
The white wire from Pad 5R to the input RCA ground plane needs to go to the Star ground point between the caps.
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Thanks. What was not show was the heavy bare wire leading from the RCA ground plane that indeed leads back to the Star ground.

Got her powered up yesterday for first checks. Bias set to 355 mv each side, plus checked main caps and control board 15 volt supplies. I was then bummed to see -230 mv on left side and 740 mv DC offset on right side. I'm still using original drivers that were pulled and checked. With ancient driver board, offset was lower all around. Hope I did not mess up Joe's board. I could not resist but cheap pair of test speakers sounded fine at around 15 watts or so but pushed no higher. I now have scope but still working on a cheap load resistor. I love this stuff..

This is where I could use help pinning down the offset.

Mike
 
There should be no ground wire from the RCA ground plane to the board or star ground EXCEPT for the ground wires in the shielded cable from the RCA ground plane to the board.
 
laatsch55 said:
There should be no ground wire from the RCA ground plane to the board or star ground EXCEPT for the ground wires in the shielded cable from the RCA ground plane to the board.
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Pardon my confusion. Amp is wired exactly as found with white wire, and shields tied to star ground, with all reading 0 ohms to chassis. Joe shows the white wire as "Chassis Ground" wire. So, you're saying disconnect the white R5 and run directly to Star ground, right? I will do this as soon as garage drops below 200 F tonight, no AC.

Thanks for your patience,

Mike
 
Magic Smoke said:
I will do this as soon as garage drops below 200 F tonight, no AC
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LMAO!!! I know Southern Louisiana all too well. I lived in Bayou Vista/Patterson area just a few miles from the Gulf, the humidity is especially brutal
 
Northwinds said:
LMAO!!! I know Southern Louisiana all too well. I lived in Bayou Vista/Patterson area just a few miles from the Gulf, the humidity is especially brutal
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Wow, small world eh? I've worked at Oceaneering, just down the road from you, for the last century or so. One more year to go if wife does not have me killed. Lol, I wonder if garages are worse in the Phoenix area, my extended family won't tell, but we all know that's dry heat, no?
 
Magic Smoke said:
Pardon my confusion. Amp is wired exactly as found with white wire, and shields tied to star ground, with all reading 0 ohms to chassis. Joe shows the white wire as "Chassis Ground" wire. So, you're saying disconnect the white R5 and run directly to Star ground, right? I will do this as soon as garage drops below 200 F tonight, no AC.

Thanks for your patience,

Mike
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The 5R wire from the board should go to star ground....
 
Magic Smoke said:
Wow, small world eh? I've worked at Oceaneering, just down the road from you, for the last century or so. One more year to go if wife does not have me killed. Lol, I wonder if garages are worse in the Phoenix area, my extended family won't tell, but we all know that's dry heat, no?
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Oceaneering?? As in offshore oilfield??
 
Magic Smoke said:
Wow, small world eh? I've worked at Oceaneering, just down the road from you, for the last century or so. One more year to go if wife does not have me killed. Lol, I wonder if garages are worse in the Phoenix area, my extended family won't tell, but we all know that's dry heat, no?
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I started as a roustabout then ended up working for McDermott Marine in Amelia. Not sure what they are called now but they built offshore platforms and coordinated supply boats to the Gulf rigs
 
laatsch55 said:
Oceaneering?? As in offshore oilfield??
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Northwinds said:
I started as a roustabout then ended up working for McDermott Marine in Amelia. Not sure what they are called now but they built offshore platforms and coordinated supply boats to the Gulf rigs
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Yes sir, as in 200 miles offshore oilfield. We run the ROVs, you guys probably watched our videos from the Macondo fire. Did a lot of work on the McDermott DB-50 doing platform installs with ROVs or divers from my old company Taylor Diving. Amelia, ouch, July temps can melt a new platform on it's own?

I'll try to get on the white wire today after chores...

Thx, Mike
 
Taylor diving rings a bell for sure. Thanks Mike.
 
OK, broke out my hog leg iron so 5R now directly to copper bar. Thanks for looking!

Now my new thorn in the side, the DC offset. I got left channel at -.210 mv and right channel at .878 mv. Bias holding well, both channels at 355 mv. Any suggestions for the offset?

Thx, Mike
 
Do you remember a diver by name of Charlie Daniels (no BS, that was his name). I shared a trailer with him on Saturn. He used to fly out of Galveston with me and we flew via helicopter out to do the 2 week on, one week off shifts. He was DEEPWATER, a rare breed back then since there was a lot of accidental deaths. He used to work on the strappings mainly so was on different rigs all the time. I was on A222 the whole time I was employed. I think a hurricane in the 90s took it out. Mainly NG production
 
Magic Smoke said:
Yes sir, as in 200 miles offshore oilfield. We run the ROVs, you guys probably watched our videos from the Macondo fire. Did a lot of work on the McDermott DB-50 doing platform installs with ROVs or divers from my old company Taylor Diving. Amelia, ouch, July temps can melt a new platform on it's own
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Anywhere in SL is brutal in the Summer. Humidity 100%, 90s temps... you drank water constantly or they carried you out on a stretcher. I do not miss my roustabout days of labor and board for $75 a day LOL. Charlie got me into Galaxy Marine in Patterson when I got my Z card and from there I went to McDermott
 
Magic Smoke said:
Yes sir, as in 200 miles offshore oilfield. We run the ROVs, you guys probably watched our videos from the Macondo fire. Did a lot of work on the McDermott DB-50 doing platform installs with ROVs or divers from my old company Taylor Diving
Click to expand...

Nope, that came long after me. I worked from 1983-86 then the price of oil was crashing and it was move back to NY or work on a shrimp boat
 
Their derrick barge is a bad mofo, set a world record last year for a heavy lift of a 3250T jacket
 
Northwinds said:
Do you remember a diver by name of Charlie Daniels (no BS, that was his name). I shared a trailer with him on Saturn. He used to fly out of Galveston with me and we flew via helicopter out to do the 2 week on, one week off shifts. He was DEEPWATER, a rare breed back then since there was a lot of accidental deaths. He used to work on the strappings mainly so was on different rigs all the time. I was on A222 the whole time I was employed. I think a hurricane in the 90s took it out. Mainly NG production
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Nope, that name does not ring any bells. Yea, the diving industry is pretty much shallow water and river work these days due to huge cost for helium and triple lock SAT chambers with support personnel. I'm glad I'm near EOL lol. I love the price at the pumps but the whole industry is SOL until the price climbs back up. If your not supported in the oil industry, who the hell wants higher pump prices, no?

cheers
 
Magic Smoke said:
OK, broke out my hog leg iron so 5R now directly to copper bar. Thanks for looking!

Now my new thorn in the side, the DC offset. I got left channel at -.210 mv and right channel at .878 mv. Bias holding well, both channels at 355 mv. Any suggestions for the offset?

Thx, Mike
Click to expand...

Edit: How I misread my meter I can only blame the Dilaudid the Doc gave me for kidney stones that won't budge this last week! So, DC Offset is way good and don't listen to me when I'm "stoned" immaculate.

When latest health issues clear up, time to order protection board and neaten up wiring.

Cheers,

Mike
 
I was still scratching my head over those figures....
 
When there is a small problem offset is over 1 volt. After that it can be 10 to rail voltage. That 200 to 800 was making no sense. It was looking like we were going to learn about another failure mode.
 
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