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SE SV-811-10 power supply
SE SV-811-10 power supply
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Old 13th April 2018, 08:37 PM   #41
Lewis1 is offline Lewis1  United States
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Default model vs. breadboard

I modeled my latest design for the B+ power supply in PSUD. Took a screenshot of how it shows the PS will perform at no load (actually a 1mA load). Runs about 870V. Then I breadboarded it and got 865V. Pretty close!
When loaded, I think I will get a bit over 600V B+. The schematic calls for 500, but the SV811 seems like it would be happy with 600. Am I wrong about that?
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Old 13th April 2018, 10:41 PM   #42
audiowize is offline audiowize  United States
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Quote:
Originally Posted by Lewis1 View Post
I was surprised to see this statement in the help section on the transformer/rectifier: "For full wave rectifiers, use the voltage for one side only. For example, if the transformer off load voltage is 350-0-350V (700V end to end), the correct value to enter is 350."
Does that seem right? Isn't that for a half wave rectifier?
Think about it this way:

For a full wave rectifier with the CT grounded, fold it in half and it kinda looks like two half wave circuits in parallel.
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Old 15th April 2018, 11:06 PM   #43
Lewis1 is offline Lewis1  United States
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Default Progress!

Making some progress on the SV811-10 monoblocks. Pics show one chassis with the layout diagram drawn directly on it. Then I skipped over a lot of tedious cutting, drilling, sanding, priming and painting to show the bookended pair after shooting with a couple coats of two-part urethane.
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File Type: jpg IMG_20180409_183352.jpg (995.6 KB, 108 views)
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Old 15th April 2018, 11:10 PM   #44
Lewis1 is offline Lewis1  United States
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Default Power supply coming along

Then the last two are bottom views showing most of the power supply components squeezed in. I was able to get everything into the outside third of the chassis, with a little distance from the driver tube.
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File Type: jpg IMG_20180415_165937.jpg (773.4 KB, 48 views)
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Old 15th April 2018, 11:12 PM   #45
Lewis1 is offline Lewis1  United States
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Default Thanks, Audiowize and a question about point-to-point wiring

Audiowize, that is a helpful way to visualize it. Thanks!
Because of the tube layout, there will be a few inches between the 6EM7 and the SV811. Where should the coupling cap go? Close to the driver? To the SV811? In the middle? Or does it matter?
Thanks,
Lewis
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Old 16th April 2018, 02:07 PM   #46
audiowize is offline audiowize  United States
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It doesn't really matter.
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Old 17th April 2018, 03:05 AM   #47
Lewis1 is offline Lewis1  United States
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Default Tonight's winner in the category of "ridiculously over-engineered"

I want a point to bring all the power supply grounds to, and I want it off the chassis. I didn't have anything suitable, so I made a pair of the little guy in the pic. It's a piece of acrylic stock, center drilled on the lathe, then tapped 10-32 on one end for a button-head machine screw to attach to the chassis, and tapped 10-24 on the other end for a brass stud to collect all the ground leads. Ain't DIY great? Imagine a production shop taking an hour to make a pair of stand-offs!
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Old 17th April 2018, 11:38 AM   #48
jdg123 is offline jdg123  United States
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SE SV-811-10 power supply
Thatís the best fun of this pursuit, taking care of the unique needs of ones own design. Nice work!
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Old 20th April 2018, 09:40 PM   #49
Lewis1 is offline Lewis1  United States
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Default 6.3V DC too high?

I put together the DC power supply for the SV811 pretty much exactly like it is shown here: SV811/SV572 SE1. The transformer puts out about 7.4V unloaded. Rectified, I get about 8.6V DC unloaded, which makes sense (7.4 X 1.4 = 10.4, minus a little less than 2V for the bridge and diode).
Isn't that going to be way too high?
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Old 20th April 2018, 10:09 PM   #50
w5jag is online now w5jag  United States
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The tubes draw 4 amps filament current each, so the voltage drop will be substantial.

I used two Vishay MBR1645 rectifier diodes, about 10K uF, and got right at 6.3 VDC at the tubes.

I think you'll be okay.

Win W5JAG
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