Stuart Polansky wrote:
Ray, take a look at those resistor wattage! That 3.4k is 25 watts! Some if the others are 5 and 10 watts. Physical size and heat dissipation will preclude PCB, perfect or turret board mounting.
Stuart
I am not planning to use a PCB. I just like to use PCBExpress to plan a layout since I tend to lose layouts drawn on paper.
Yes, the 25 watt resistor will be a problem. I have a couple of 25 watt 5K resistors and I will initially put them in parallel with a series combo of a 10 watt 10K and some other power resistors to make the required 3K4. The combo needs to be 10K7. If the amp works and is a keeper, then I can order the single resistor from Mouser in my next order. Or replace the 3.4K resistor by an LM17 in series with a resistor as shown on Alex Kitic's site.
http://rh-amps.blogspot.com/2018/10/rh6080he-headphones-edition-its-been.htmlAnd yes, I will need to think about the heat issues. By the way, each tray in the trolley has a perforated bottom so ventilation will not be a problem.
ray