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Thanks for the clarification, I did not consider the amp in a system with other components with respect to potential ground loops involving DC ground. My assumption was the cap provides a path for high frequency noise to chassis ground. If that cap charges up due to noise, it could create an...

Looking good, nice work.

Is there a reason you do not recommend populating R23 to help discharge the coupling cap?

Not required, but you may want to remove the nylon washer below the screw for intended PCB GND connection circled in Red below:

Any reason you did not use provided stainless fasteners on the barrier terminal block?

Very nice! Glad to see you’re following directions and learning from other build threads. Soldering the bias connectors before the other taller components is a good idea, in the correct orientation as well…

Nice! Looks like a very clean amp to start from. Enjoy the process, post pictures, and ask questions if unsure about anything.

Very nice! Keep the pictures coming. Interested in your impressions once completed and had time to evaluate.

That’s the original WO cap update for the 400.

First I’ve observed with more than one assembly tag as well. The amount of variation in components and assembly of these amps continues to amaze me, even outside of the 4 fin variants.

Ok, who’s the yahoo that performed a WO PL400 SII quasi comp update (control board, outputs, and caps) and glued the caps to the bracket?? Had to destroy the caps on removal and will be a pain to clean the bracket before placing new updated caps. Although I’ll admit, the update was one of the...

I have a line on a few 700B basket cases (only transformer, heatsinks, and meters usable) if interested. Most likely ~$350…

The warm white LEDs are very close in appearance to the stock incandescent bulbs with much better reliability and very little heat.

I can state from first hand experience with equipment in my room, the full comp WOPL is as good or better than most big name amps at 2-3 times the cost. If you really want to wake your system up, try the new Model ONE amp, less background noise, tighter control of low frequencies, and greater...

Tool - Chocolate Chip Trip Test the soundstage boundaries of your 2 channel setup. Best played cranked to 11.

Thank you for your service! We will have you rocking’ with an upgraded WOPL in no time.

No problem, I’ll work you into the build queue based on parts availability.

He is referring to the caps on the rectifier board, they are not the supplied Blue film caps and they are mounted on the top side of the board (should be mounted on the underside of the PCB).

Thoughts on your project highly depend on your goals and what you want to achieve with this amp. For example, - What other components do you plan to use around this amp (Preamp, source, speakers) - What budget you feel comfortable spending (this can be a deep rabbit hole) - Willingness to...

Must be the assembly...