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Old 13th May 2013, 11:29 PM   #2261
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Hi Buzz..yes a 6ax4 after ss rectifiers for slow startup and "hiding" ss rectifier noise. I've added a snubber and chokes to "handle" the reverse recovery spike.
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Old 13th May 2013, 11:30 PM   #2262
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Mind posting final version. I am ashamed to admit i liked the SS rectification version best, but blame this partially, at least(or completely), on my own ignorance. I wil have to give it a shot, but would like to have your circuit as well. If nothing else, seems clever.
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Last edited by buzzforb; 13th May 2013 at 11:34 PM.
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Old 14th May 2013, 12:46 AM   #2263
Salas is online now Salas  Greece
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Quote:
Originally Posted by Bas Horneman View Post
By the way as we speak I'm exporting a dxf for a friend to cnc a plate for the Salas 6v6. (He just completed a diy cnc machine) So I'm curious to see how well it will turn out...Smallest bit he has is 2mm..hence the font and thickness. Still it should look nice.
Cool, like special numberplate car cool kinda.
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Old 14th May 2013, 12:53 AM   #2264
Salas is online now Salas  Greece
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Hey Salas,

Still very much enjoying the Salas 6v6 pre! I find it hard to imagine anything being better. Still have not added the SSHV2's. I just have so little motivation for adding something to a project that works so well.

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Bas
If it ain't broken don't fix it they say...

Still do publish your B+ PSU config and your heaters PSU config when able since there are experiments going on here and guys would love more options that work well I think.
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Old 14th May 2013, 07:37 AM   #2265
stajo is offline stajo  Sweden
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So how do I make a variable filament CSS best? One way would be to buy an expensive 2-3 W wirewound pot per channel and parallell with a 3 R ish resistor. Can anyone think of a better way?
http://www.onsemi.com/pub_link/Collateral/LM350-D.PDF
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Old 14th May 2013, 07:46 AM   #2266
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This is what I use. Simple but it works. (Plus I had the pcb's lying around doing nothing) I have the current source after the voltage source. But really some dc followed by a current source is good enough.

The pcbs can still be ordered if you don't want to do it p2p.
Scroll to LM317 PCB
A simple General Purpose PCB for Voltage and Current Sources

Or I'm sure there are cheaper alternatives on ebay.
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File Type: gif lm317pcb5.gif (8.1 KB, 136 views)

Last edited by Bas Horneman; 14th May 2013 at 07:48 AM.
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Old 14th May 2013, 07:50 AM   #2267
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Originally Posted by stajo View Post
So how do I make a variable filament CSS best? One way would be to buy an expensive 2-3 W wirewound pot per channel and parallell with a 3 R ish resistor. Can anyone think of a better way?
http://www.onsemi.com/pub_link/Collateral/LM350-D.PDF
Just check the app notes in that publication .

You can use a fixed sence resistor and a smaller pot for the setting.
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Old 14th May 2013, 07:54 AM   #2268
stajo is offline stajo  Sweden
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Thanks Bas. Doede makes nice stuff, I like him. How do I calculate the wattage needed on the CSS pot? I tried to figure it out the other day but something interupted me.
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Old 14th May 2013, 07:56 AM   #2269
stajo is offline stajo  Sweden
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Originally Posted by flatheadmurre View Post
Just check the app notes in that publication .

You can use a fixed sence resistor and a smaller pot for the setting.
You say fig 22?
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Old 14th May 2013, 07:58 AM   #2270
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Thanks Bas. Doede makes nice stuff, I like him. How do I calculate the wattage needed on the CSS pot? I tried to figure it out the other day but something interupted me.
You know the current going thrue.

Ohms law will tell you the rest.

Then multiply for a good safety margin.
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