400/1 “Linda” Full WOPL

[AngrySailor]

Working on Linda’s backplanes a little this morning. Have to head to the shop take care of a few things this afternoon then back at Linda this evening.

 

[AngrySailor]

Finished populating the backplanes. Time to gut the chassis I guess.

 

[laatsch55]

The fun part...

 

[George S.]

When you wire your backplanes, you have two options. You can "Daisy Chain" them together with short pieces of wire, or wire them "Dual Mono" as in the photo. Also note the green B+ wire that comes off the right top corner of the right backplane. This goes to the DCP as Joe explains in the wiring directions, but easily overlooked. This is best way to run this particular wire, rather than a long run all way back over to the cap.

 

[AngrySailor]

When you wire your backplanes, you have two options. You can "Daisy Chain" them together with short pieces of wire, or wire them "Dual Mono" as in the photo. Also note the green B+ wire that comes off the right top corner of the right backplane. This goes to the DCP as Joe explains in the wiring directions, but easily overlooked. This is best way to run this particular wire, rather than a long run all way back over to the cap.

Hey, you got a “Linda” too! Thanks for the heads up. Gonna be lots of reading as I go through the wiring for sure.

 

[mlucitt]

Also note the green B+ wire that comes off the right top corner of the right backplane. This goes to the DCP

You can check with Don, but I believe the current draw on that wire going to the DCP Board is miniscule. It could easily be a green 22 Ga. wire.

BTW, I like your use of forceps as a soldering heat sink.

 

[laatsch55]

22 is fine, I run 22 clr from the rectifier..

 

[AngrySailor]

Gutted Linda this morning. Didn’t even have to desolder the transformer center tap leads from the bus bar. Cold and broken solder joints courtesy of Pete’s Electronics in St. Catharines Ontario, Canada. Same guy who “lost” (cough STOLE cough) my RT-707...

There were only 4 transistor sockets that weren’t broken in this amp... think she’s had a hard go over the years...

 

[AngrySailor]

Started picking at Linda again, put the last four zeners in to complete the board. It’s been a while since I’ve worked at this so I went through the BOM again just to make sure it was complete. Got nervous for a minute as I thought I had made an oopsie but had the BOM mixed up with Tim’s quasi comp... looks like it’s ready other than cleaning now.

 

[laatsch55]

Looks like ya might have a little back wall work yet..

 

[George S.]

Linda built a lot of amps, I have a 400 S1 Linda.

 

[Gepetto]

Linda built a lot of amps, I have a 400 S1 Linda.

She got around...

 

[George S.]

She got around...

Yeah, she's front and center on the PL Christmas card.

 

[AngrySailor]

Linda’s coming to life. Passed all tests with drivers installed today. I’m busy and grumpy. I said grumpy, not angry so that’s an improvement...

 

[J!m]

Nice to see your grumpy ass back!

 

[AngrySailor]

Nice to see your grumpy ass back!

Hibernating...

 

[grapplesaw]

It’s great to see you posting again buddy. I’ve missed your project updates

 

[AngrySailor]

Go easy on me, I probably misspoke and otherwise fucked up but at then end of the day the smoke stayed in. Just have to harness up the wires neat, add Don’s DCP back in and button her up.

 

[AngrySailor]

She’s alive! No issues getting it together other than having to grind the capacitor hold down plate to clear the meter stud. I’ve got to check my left speaker and crossover. Somethings not right but Tim was acting goofy on the left also so I doubt it the amp. Haven’t listened to her much as I want to run some tests on the left speaker first. There’s no audible hum but if I have her apart again I will reroute some wiring... I already moved the thermal switch wiring but there’s some others could be farther from signal.

 

[Gepetto]

She’s alive! No issues getting it together other than having to grind the capacitor hold down plate to clear the meter stud. I’ve got to check my left speaker and crossover. Somethings not right but Tim was acting goofy on the left also so I doubt it the amp. Haven’t listened to her much as I want to run some tests on the left speaker first. There’s no audible hum but if I have her apart again I will reroute some wiring... I already moved the thermal switch wiring but there’s some others could be farther from signal.

Too late now Andrew but you could have avoided the milling of your hold down plate by mounting the bridge in the recommended rear hole (as pictured on the web page), not the front hole. When mounted in this position, the edge of the hold down plate almost comes in contact with the chassis side wall.