JLM AUDIO

There is no filament connected with those previous voltage measurements.

The filament is set to 6V right now. These are the original tubes to the preamp. The 48V seems fine. Haven’t put a load on it though

I only have one preamp connected.

With nothing connected to the PSU I have 306VDC unregulated and the regulated supply jumps up to 296VDC. Both HV1 and HV2 have the same issue, when the Filament is connected they won't go higher than ~256VDC

I’ve got the scorpion up and running now with it bolted to a 1/4” bar of aluminum. The heater voltage seems solid, but I’ve got HV2 cranked as high as it will go, and under load it stops at 256V. I’ve got 266V unregulated at the power resistor and 116VAC at the outlet (USA). Does this seem correct u...

I tried a heatsink like the one linked below which claims 7 C/W on the datasheet but it only helped a little bit

https://www.mouser.com/ProductDetail/Wa ... A84w%3D%3D

Hello, I’ve just built the scorpion supply and am getting it up and running with a vintage EAB VE12 mic preamp. I’m trying to just work on the preamp on the bench before racking it up so I don’t have proper heat sinking and I can’t get the Filament regulator to stay on - it’s getting too hot and the...

Thank you for your input - I think you’re right regarding voltage sag and unregulated supplies. I will give this supply a try when I’ve got the time to open up this project. Thank you!

Thanks for the reply. Possible to change those zeners to 160V versions? Or add another 20V in series?

Hi,
Is 300v the top output range based on the regulator or the VAC rating of the included transformer?
I have an old preamp that wants 320V at the first stage and 200V at the second.

Hi again, I'm trying to understand how this unit works because I'm interested in building something similar. Is it really a 8x8 matrix where you can send input 1 to any of the 8 outputs with just one knob? I also see 8 master out levels. In the picture it looks like the boards are called AUX8SUM but...

Was this with the Statten board and your own concentric pots? Would love to see the insides! Thanks