WOPL 700 series II build

Got the 5th row transistors installed with no issues.
No shorts from DC ground or B+/B- rails No shorts transistor cans to chassis,
No blown fuses, no smoke, or smells Proper voltage, 0v at the output, checked bias about the same
Thanks for looking.........

20260102_234343.jpg

Voltages....
20260102_235300.jpg
20260102_235207.jpg

Bias readings....

Right Channel
20260103_000510.jpg
Left channel
20260103_001009.jpg
 
VSAT88 said:
Shit man you're pictures are great! Here is one I took of a Neon Psalm Tree I just found and repaired. Bet it's not as good as yours though HA!
View attachment 88836
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So you know what a GLG is but I DON'T know what a "Psalm Tree" is....... Do you get eternal life if you drink a coconut??? :)
 
That's when the trouble started...........

I was bringing it up slow on the variac and DBT, Around 45v the meters lit up looking like this........

Meter switch set on Dot....
20260105_154111.jpg
Meter switch set on Bar...
20260105_155008.jpg

Since all the test were good after installing last row of transistors, I figured it had to be in the front panel wiring. Rechecked all the wiring it was right. So I swapped boards and sure enough, moved to the right channel.... I looked the board over and no missed or bad solder joints I could tell. Maybe a bad component ? Has this ever happened before? Any suggestions?

Meter switch set on Dot...
20260105_192228.jpg
Meter switch set on Bar...
20260105_192345.jpg
 
You placed IC1 backwards on that meter board, Pin 1 should face to the Left:


i-MBGsHqw-XL.png
 
That board lay out is beautiful.. A great way to start my day. Looking at one of Joe's boards and a hell of a nice solder job!
 
laatsch55 said:
Maybr its little IC said see ya!!
Click to expand...
Yes Sir, That's exactly what it was....Good call Lee.

Hexis22 said:
You placed IC1 backwards on that meter board, Pin 1 should face to the Left:


i-MBGsHqw-XL.png
Click to expand...
Yes Sir, I sure did. Good catch... It was had to see with that picture so dark. I removed it last night and broke one of the pins trying to straighten it out. Those Ic's are a bugger to remove. (At least for me). So I took one of the boards out of my 400... So I'm back in business. I still need to set the meters today.

After the board swap....
20260105_235954.jpg
 
Dnspy007 said:
Yes Sir, That's exactly what it was....Good call Lee.


Yes Sir, I sure did. Good catch... It was had to see with that picture so dark. I removed it last night and broke one of the pins trying to straighten it out. Those Ic's are a bugger to remove. (At least for me). So I took one of the boards out of my 400... So I'm back in business. I still need to set the meters today.

After the board swap....
View attachment 89135
Click to expand...
Doug, the board is much more valuable than the IC. Unless it is a one of a kind IC, you always sacrifice the IC by cutting all 14 legs off at the body of the IC. After you do that, removal of the individual pins is a piece of cake.
 
FWIW, on small chips like that I have very good luck pulling them intact with a vacuum solder remover on my rework station . . . Depends if you need to save the chip or not . . . (and what tools you have).
 

Dnspy007,​

Which Polk's?​


Driving the Polk SDA SRS's with a WOPL 700 II, fantastic.
They can vibrate the whole house when needed. With a freq response of 10Hz-26kHz no sub is needed. Movies are a beast on these.
If I turn them up too loud the whiffs dishes start moving in the kitchen, usually happens after a few frosty beverages.
 
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