It's a heatspreder that is between your sinks and outputs transistors. they need a clean flat surface to be mounted on.
Ah, so I mount the outputs transistors to the plate and mount the plate to the sinks? Why can't I mount the outputs transistors to the sinks directly?
Also newbie question. If the square black things are outputs transistors then what are the round silver things I've seen on earlier SS amp?
Also newbie question. If the square black things are outputs transistors then what are the round silver things I've seen on earlier SS amp?
I just finished the V3 monoblocks, biased everything. Plugged it in and everything sounds fine. Full range and detail for days. I do have a problem however. There seems to be hardly any gain. If i were to guess it would unity gain coming out of the V3s. I read that this should have a gain into the 20dBs in standard config? What am i missing here? I have 98dB efficient speakers and i have my pre-amp (12dB gain).
Also, since this is a DC coupled SS amp it relies on balance between the P and N transistors or you will get DC on the output. Sounds scary, but it's really not...it's common in SS amps. Temp differences effect this balance. So you want the transistors to be the same temp...thus the baseplate to spread the heat.
The transistor shape is just the "case". The silver metal round cases are designed for mounting on an "L" shaped piece with a hole in them and are definitely not as popular these days.
With speakers disconnected feed the f5 test tone at a known voltage...say 1V. See what comes out of the speaker binding posts for volts. Then you will know.
A mistake in the feedback network (resistor values) would explain lack of gain and the amp still working.
I have yet to confirm but i have been studying pictures of my FE board. I believe my R2 (Input snubber?) is an order of magnitude less than it should be. Based on the bands i think it is a 4.75K as opposed to the 47.5K. I will confirm when i get a chance.
Well that's a thought. Do people actually build these amps with water cooling? I know gamers that play for days on water cooled computers. Come to think of it, I drive 40k a year with a water cooled engine.
Liquid Cooling Build
Sure. You can liquid cool if you want. People do it. You just need to make sure you have safety measures in place if the system breaks down (leaks, pump failure, etc.), and be willing to live with the risk.
The positives include greater cooling capacity and less size.
Sure. You can liquid cool if you want. People do it. You just need to make sure you have safety measures in place if the system breaks down (leaks, pump failure, etc.), and be willing to live with the risk.
The positives include greater cooling capacity and less size.
Here is the plan. The 12"x12" pyramid will house the power supply and on the side of the pyramid the 45 degree pipe sockets will attach to boxes that are 7"w x7"d x15" tall with the heat sinks on the front. These boxes will stand straight up so the airflow will go up through them.
What issues do you see will this design???
What issues do you see will this design???
Attachments
A pyramid is a pretty strong shape. You thinking something along the lines of 0.090" 6061 T6?
BTW, lovely pre-amp.
BTW, lovely pre-amp.
Thanks Jeff. The guts of the pre amp is Pete Millett's Lo-Mu preamp. It sounds fantastic in front of my GM70 amplifier.
I will make it strong and this is just my initial thinking. It will evolve I'm sure.
I will make it strong and this is just my initial thinking. It will evolve I'm sure.
By the way, that is a production pyramid and the come in 2" square increments up to 20". I'm sure it I'd thin steel but I'll brace it.
Gain problem confirmed. I had a 47R5 in the 47.5K input snubber spot. 🤦 i remedied the problem and all is well in the world.
Also, another thing i found in the process of building the V3 monoblocks. I am using 4 amp fuses in the power switch that at comes with the back panel kit. If i use the switch with straight mains power i blow a fuse every time. The only way i can start them is with my variac, slowly. I don’t know if i have under fused it or if i just need to use the soft start. I have ordered the soft start kit to be safe.