A guide to building the Pass F4 amplifier

[ItsAllInMyHead]

^ Ground lifts are on the V8 boards. I think I see one peeking out.

 

[Eric]

Gotcha! I'm not super familiar with this set of boards. I do like those snubber boards that sit on top of the rectifiers, though!

 

[ItsAllInMyHead]

^ I'm a big fan of Randy's PSU layouts. I also love the snubber / rectifier boards. If you haven't tried them... I gotta admit ... my absolute favorite little gem is the soft-start / safety cap boards.

 

[baeijsman]

Why do you want to run one at such low voltage?

I think low voltage amps can sound amazing, and I like this bias circuit, so I would like to try a combo.

 

[6L6]

Sounds good!

 

[birdbox]

solve it with a CL-60 (or similar) between channel ground at the board level and AC mains ground at power entry.

@ItsAllInMyHead answered the question and I'm just adding a photo from Randy's build guide. Sorry I missed that in the massive photo dump.

Pa

 

[xrk971]

Beautiful build!

 

[sebbyp]

Looks fantastic, happy listening!

 

[oltos]

Use alu bracket to lift 'clean' audio ground from 'dirty' PSU ground or connect direct to copper plate?

View attachment 1330439

Given the choice between aluminum and copper, I would choose copper every time.

Anyone know how "dirty" was the grounding scheme in the stock F4?

 

[oltos]

my guess is the x-over implementation.

It was easy to hear it fall apart.

I had high hopes since I purpose built the F4 for exactly that role.

Not cheap but looks like a great way to implement two-way active crossovers. https://danvillesignal.com/dspnexus-dsp-audio-processor

 

[DrDyna]

Up next in my build queue: The F4!

Stay tuned! hehehe
Thank you again to 6L6, who's been a tremendous help to my incessant build fever!

 

[zman01]

DrDyna,

Good to see the progress on your build.

Another shout-out to 6L6 - Jim, thank you for putting together the detailed build guides, and being an active source of guidance and encouragement to DIYers on the forums!

 

[Dennis Hui]

Yes, Jim is the Great Enabler.