nelsress begins his WOPL 400 project

Nelson, Joe may have some new info on the Rev B 400 backplanes, he's done something different for the #3 wire between the driver board and the backplane...
 
laatsch55 said:
Nelson, Joe may have some new info on the Rev B 400 backplanes, he's done something different for the #3 wire between the driver board and the backplane...
Click to expand...

Thanks for the info Lee, if the info doesn't come with the parts, I'll ask Joe in an e-mail. Much obliged!
 
Gepetto said:
Hi Nelson
You will be inundated with reading material as your order ships out...
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Nelson - Joe's not kidding. You'll get an ass ton of stuff to read and if you follow it carefully you'll have a happy ending. :lol: :tongue5: :shaking:
 
laatsch55 said:
Nelson, Joe may have some new info on the Rev B 400 backplanes, he's done something different for the #3 wire between the driver board and the backplane...
Click to expand...

Do tell! Is this something I need to look into for my 400?
 
If you have a Rev B backplane it's wired differently than the A board is all...
 
Brass tacks

Okay, I've finally decided to tear this baby down and get down to brass tacks. I stripped away all the point to point back plane stuff, used the new hardware, eliminated the star washers between the heat sink fins and the chassis and inserted the shoulder washers. It seems I've got a lot more wires remaining when compared to the assembly instruction photos and the ones on Lee's first WOPL 400 build thread. Here's what I've got in photos up to this point.

As for preparing the back plane boards, I'm a little fuzzy on what I'm doing with the masking tape, etc. on that step. Thanks guys.

WOPL 400 Project 004.jpgWOPL 400 Project 002.jpgWOPL 400 Project 001.jpgWOPL 400 Project 005.jpgWOPL 400 Project 006.jpgWOPL 400 Project 003.jpg
 
How did I miss this thread? Glad I found it- I didn't know you could get a jolt from the transistors if you leave the covers off...

(I should buy a cooling fan, shouldn't I?)
 
Fan

Hi Mark, I don't know if you should use a fan or not. I had my original, stock PL 400 on the bottom shelf of an enclosed cabinet without a fan for over 20 years without a problem. Lee or Joe could tell you/us how important a fan is, perhaps the new mods make it run a little hotter, it is after all putting out even more watts than in its original version.
 
MarkWComer said:
How did I miss this thread? Glad I found it- I didn't know you could get a jolt from the transistors if you leave the covers off...

(I should buy a cooling fan, shouldn't I?)
Click to expand...

Only if you touch something else BESIDES the transistors...
 
nelsress said:
Hi Mark, I don't know if you should use a fan or not. I had my original, stock PL 400 on the bottom shelf of an enclosed cabinet without a fan for over 20 years without a problem. Lee or Joe could tell you/us how important a fan is, perhaps the new mods make it run a little hotter, it is after all putting out even more watts than in its original version.
Click to expand...

I've had to use a fan to keep them cool during AP testing at 10 watts. Just depends, best way to determine is to monitor heatsink temp with the ol Mk 1 thumb and finger....
 
Where is the thermoswitch Nelson?? Yes you have a lot of extra wires there. A lot of what you will solder to the bacvkplanes will take the place of some of those.
 
The two holes in the center of the backwall is where it goes. If you did not remove it then I better get one headed your way...the thermoswitch is integral with the AC mains in wiring.....
 
Ooops

I found what the thermoswitch is from your first WOPL 400 thread, damn. No Lee, it had one, I just cut it off the wire harness! For some reason I thought it was going to be scrapped and something on one of the boards was going to take it's place. Now to figure out what wires went where as I cut the wires off tight up against so as to be sure to have enough wires. :)
 
Step 1 Backplane boards

If I'm not mistaken, the threaded cups that get soldered in the back plane boards first get inserted from the solder (non-silk screened) side. I'm assuming that they get soldered onto the boards, also on that same side but I'm not sure what I'm supposed to use the tape for and how I can place a piece of masonite on top of these AND solder them to the boards at the same time. Obviously I'm confused and, even though I swear English IS my first language, I'm having difficulty understanding this seemingly simplest of steps. Yikes, I could be in trouble if this is tripping me up!! :shaking:
 
OK, so we are not confused , let's use proper nomenclature. The first thing to be soldered to the backplanes are the "solder cups". Those are the friction grip cups for the output transistor leads. The next thing is the "threaded standoffs". Those are the threaded inserts for the output transistors hold down screws...
 
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