Pictures of your diy Pass amplifier

My F4, Waiting on my transformer so I can listen to both channels. Biased at 1.3 amps and the heatsinks are at 50 C.
 

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I have F3's and really like them. I've been wanting to build the F4 for sometime and in anticipation I built the Impasse preamp. The transformer group buy pushed me over the top. I had heatsinks and power supply boards from previous group buys. When they are all together I can get a good AB comparison.
 
Just speaking because I can, I kind of like that anodized black front plate.

If you really wanted to get kind of in your face about it (well, too late for that since the etched circuit diagram is staring you in the face already), then put a diode symbol in the circuit diagram for the power indicator, and drill a small hole corresponding to that and put in a diode.

But for mercy's sake, use a relatively conservatively rated light output diode (your amp, your colour choice, but I am partial to the orange or green ones). I was victim to an amp last week and I so wanted to turn off the amp as the light from was so agonizing (remember at the end of Indiana Jones when they open up the ark? That amp used it as inspiration).

Since I am full of opinions when projects aren't my own, I would make a slight design recommendation to the face plate -- make it overhang the edges top, bottom, and sides by 2 or 3 mm than the side fins, bottom plate, and top plate.

Furthermore, make the diagram maybe 92.5 - 95% of what you have it on the current face plate mock up. It seems to be too close to the top edge.

Otherwise, it is very sweet looking.
 
My F4

Biased at 300mV and my middle pin temps are 45-48C.
My fans are running 8V each and are damn near silent.
I will order up some zener's to get them down to 6.5V each.
I really love this thing! It's just great.
 

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evanc,

I have the parts for the speed controller but also a question. Does the thermistor need to be in contact with the heat sink or Mosfet? I can't find it in your photos.
 

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