Your power supply is not setup properly. Please refer to this youtube guide that I made of another member.
You must always, always, always confirm your supply voltages before you connect anything to your amplifier.
The schematic and the build guide will references these voltages as well.
Oh my, I was looking so hard at the board components I completely missed the power supply was connected 😱 Yeah, I don't think you'll get far in testing with it connected like that (its shouldn't have done any damage if R109 was at max resistance) , you need to establish the dual rails - a positive +30V rail, a "0V" (GND) and a negative -30V rail. As Daniel picture and Stuarts video show. Best of luck.
Ok guys, I understand what you are saying. I'm not quite sure how to accomplish it with my power supply. Can I get +30 V out of one channel and -30 V out of channel 2 by putting the channels in parallel? To get my 0 Volts do I physically have to connect the negative (black) output on channel 1 and the positive (red) output on channel 2 and run that to the PSU ground terminal on the pcb?
I appreciate the help. I've only had that bench power supply since the beginning of the year.
John
I appreciate the help. I've only had that bench power supply since the beginning of the year.
John
Yes, but this is a series connection, not parallel.
Check the power supply manual, let us know if you need a hand
Quick rough example. Your two channels get connected in series.
Why doesn't it fit? Transistors closer together? Or it will not fit the on the heatsink?
Could the transistors be connected to the PCB through short wires? Or is that a no-go?
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Yes, transistors are closer together on EF3-5. Probably not a good idea to flywire the outputs on this.
Hello @Gianluca thank you for your reply, What is the difference between these two Dissipante 5U chassis?
https://modushop.biz/site/index.php?route=product/product&product_id=235
and
https://modushop.biz/site/index.php?route=product/product&path=242&product_id=784
Do wither come with a screen printed rear panel like the DIYAUDIO store version of your 5U chassis (see here: https://diyaudiostore.com/products/2025-deluxe-chassis-5u)?
@All are most people choosing this 5U chassis over a 4U chassis for the EF3-4 stereo configuration?