You will need to have ventilation holes in the vicinity of the big internal sink and above it so to keep around that low a temperature when you will close the lid too.
I really doubt 58c is possible, has to be the heat from the F4's.
My DCG3 is in the 2107 chassis. The mosfets are mounted to the BOTTOM plate via a 1/2 bar, not the heatsinks (due to layout) and and I am running lm317/337 mounted to the bottom plate. AND a cap multiplier.
Chassis temp at 150ma bias is low...low enough I haven't cared to measure...probably 40C. Even right under the mosfets.
Attachments
This is what I did and the chassis side gets only mildly warm with 120ma of bias.
The dc on the output measure at 0.2 and 0.3mv so still good.
I measured the Leaks and the good side reads 56R whilst the bad one is open circuitI did manage to get them apart and a very fine wire coming out of the speaker unit is broken. Just need to find a way of getting this apart.
So what happened? You managed to fix them, or you bought something new?
I don't have direct experience with that amp, member drpro uses DCG3 with F4, but I can read Nelson stating in its manual that it can go 40V pk-pk max before clipping.
If you want all that for your speakers I guess you can up the DCG3's rails to +/-20V too and fix its gain to 7 times assuming a 2V RMS digital source (2*2.83=5.66V pk-pk. 40/5.66=7 or 17dB).
You will also need a compatible rails spec JFET type servo op-amp (OPA 2604 takes up to +/- 24 for example) and good sinking for the output stage. Keep it at 100-125mA bias if you don't have to best drive low impedance headphones too so it stays cooler on the now higher rails and use green voltage dropping Leds to the relay coil (those three in a row).
If you also want the DCSTB as PSU there are provisions to up its voltage outputs by calculating much higher value resistors in place of the 1 Ohm RxJ, RyJ. How to is in the manual. You would also want 20-0-20 spec trafos now.
Nelson wrote that 14dB preamp gain was good levels in a big room with 93dB sensitive speakers and an F4. That's 5X gain and if you also have sensitive speakers you may just fix it to that gain and not modify anything else in the DCG3.
If you want all that for your speakers I guess you can up the DCG3's rails to +/-20V too and fix its gain to 7 times assuming a 2V RMS digital source (2*2.83=5.66V pk-pk. 40/5.66=7 or 17dB).
You will also need a compatible rails spec JFET type servo op-amp (OPA 2604 takes up to +/- 24 for example) and good sinking for the output stage. Keep it at 100-125mA bias if you don't have to best drive low impedance headphones too so it stays cooler on the now higher rails and use green voltage dropping Leds to the relay coil (those three in a row).
If you also want the DCSTB as PSU there are provisions to up its voltage outputs by calculating much higher value resistors in place of the 1 Ohm RxJ, RyJ. How to is in the manual. You would also want 20-0-20 spec trafos now.
Nelson wrote that 14dB preamp gain was good levels in a big room with 93dB sensitive speakers and an F4. That's 5X gain and if you also have sensitive speakers you may just fix it to that gain and not modify anything else in the DCG3.
I am currently going through a pair of Jensen transformers to achieve balance out from the DCG3 to drive a pair of F4 amps. I also have built a Pass BA3 preamp which has a bit more voltage swing than the DCG3. I would say you would be quite happy with the DCG3 driving your F4. I also have a Pass F6 that I want to use with the DCG3.
Had a bit of mechanical problems drilling the front of the case which came from the DIY shop. I have a work around and once that is done then I will move the DCG3 to the room with the F6.
I had my wife take a listen as her hearing is much better than mine. I have been doing a swap out with the AD823 opamp and a Sparkolabs SS3602 discrete amp. Her preference is the AD823, though I am partial to the SS3602. Both devices sound awesome in the DCG3. Just my take.
David
Had a bit of mechanical problems drilling the front of the case which came from the DIY shop. I have a work around and once that is done then I will move the DCG3 to the room with the F6.
I had my wife take a listen as her hearing is much better than mine. I have been doing a swap out with the AD823 opamp and a Sparkolabs SS3602 discrete amp. Her preference is the AD823, though I am partial to the SS3602. Both devices sound awesome in the DCG3. Just my take.
David