| PSU for my linestage, will it work. - Click HERE for Original Thread |
| Bas Horneman |
Hi all,
The reason for my question is that I have never used a ccs and vr tubes in a psu before..
TIA,
Bas |
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| Bas Horneman |
Please disregard the wrong symbol for VR tubes and EY81 but Switchcad does not have them and drawing them is a *****..
O...and the bottom EY81 needs some AC as well :idea: |
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| EC8010 |
Why are you using two EY81? It has a common cathode and a pair of anodes.
Neons on their own aren't ideal, and I wonder if it might oscillate. Still, you won't find out until you try. Just keep an oscilloscope handy. |
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| dhaen |
EC8010,
The EY81 is one of the TV boost diodes we've been discussing. They only have 1 rectifier per envelope. Bas is just short on schematic symbols.
Cheers, |
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| EC8010 |
| Ah. That would explain it. I should have realized! |
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| dhaen |
I'm wondering if there is enough voltage to fire the gas regs reliably.
Perhaps I'll simulate it tomorrow.
Cheers, |
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| Bas Horneman |
| quote: | | I'm wondering if there is enough voltage to fire the gas regs reliably. |
Also a reservation of mine!
| quote: | | Neons on their own aren't ideal, and I wonder if it might oscillate |
Apperently they oscillate in the presence of capacitance..that's why Lynn Olson uses no capacitance. See attached schematic.
http://www.nutshellhifi.com/preamp.gif
However I saw that Gary Pimm used a 0,056uF sovjet teflon..and Gary P works at Tektronic so I reckon a scope won't be necessary!
::o |
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| James D. |
The datasheet for the 0A3 & 0D3 specifies maximum shunt capacitance as 0.1uF so your 0.56uF is safe.
ciao
James |
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| dhaen |
Here is your PSU:
Huh, this 60 second thing is a bore...... |
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| dhaen |
Bas,
I think you need more volts to start with.
Also, with apologies to James, I'm not sure if the parallel capacitance limit is valid when the combination is fed from a constant current source...or is it?
Cheers, |
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| Bas Horneman |
Thanks John,
Just saw my tranny is 290v!!!!
Cheers,
Bas |
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| Bas Horneman |
Mmmm might just have to get a different power transformer..!!
I get around 250v with 6D22S full wave ...and 820nF as fist cap |
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| Bas Horneman |
James, John, EC8010,
Thanks so far...I guess I will just have to try it out!
I mainly wanted to know if there were mayor flaws in the design..
apparently not!
Cheers,
Bas |
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