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Hi Pierre, * Yes please put a resistor in place as per data sheet advice as this will limit surge/peak current and extend the life of the tube cathode * I'd use 47uF if I was just using a C filter or

Have you looked at the EZ81 spec sheet and understood it? Craig

Pierre, Mullard specifies a maximum capacitor value of 50uF, and a minimum 230R limiting resistance in series with each anode (which includes the winding resistance). Bear in mind that this is

Dear All I'm going to do my first PSU... tnx for this amazing tool that is PSUD. I am implementing a PSU for an high quality line stage. The load on the PSU will not be more than 40ma and the final

Missed note.? ?My new? 0-60 vdc @ 10 amp current limited labs supply? ?will not go down to 0 vdc.? ? It will? only go as low as .8 vdc which resulted in 7.2 amps? ?.8 / 7.2 = .11111 ohms?

OK, while on a rant,? (and misplacing my PSUD-3..........'wish list' from years ago)? ? I just remembered? a useful item that would be? an excellent addition to PSUD-3. And that's the option of

OK, here is what I did.? ?I used my newer? 0-60 vdc? @ 10 amp lab supply.? ( has adjustable vdc, and also adjustable current limiting).? Lab supply has built in digital? voltmeter and

I laid a dead short across the sec..... then put the fluke 87 DVM in manual ( 40 ohm)? range....instead of auto ranging. I will try again, but using my? B+K 875A? ?digital LCR meter, in the

It may help to short the other winding to suppress inductive spikes from meter auto-ranging and general digital sin.

Hi Jim, Thanks for the detailed information - it's really handy. Pretty much everything looks good in the foregoing, except the primary resistance - that's the one that's jumping out at me. Here's

Forget the 3 phase power option..... that was more just out of interest on my part. I use the measured? off load voltage? and pri/sec? DC resistance values? method on PSUD-2? to? arrive at the

Hi Jim, PSUD3 has been out in Beta already but suspended as it still needs a little more work, there's no set date for the next release. I can confirm there is no plans to do three phase and the

When is? PSUD-3? ? coming out ?? ? Will? it? do 3 phase power ? What would be helpful is being able to look at the harmonics, like for P-P ripple.? ?On? single phase, ripple is? 2F.? ?

Hi Jim, The good news is it's easy to put on, the bad news is that it will need a whole sequence of tests to be carried out before the software can be up-versioned and re-released. Given that PSUD2

Dunno if it would scale....or not.? ?How do I scale a huge plate xfmr ?? ? Do I multiply the source Z? by 10? as well? to simulate the 1/10 size plate xfmr ?

Everything scales. Pretend 1.0KVAC. Instead of 0.5Amp current, draw 0.05Amp. Result will be 1.414KV which you multiply by 10 to get actual voltage. R and C and %ripple values will be unchanged. Or

Can the max vac on the sec of the plate xfmr be increased...... like up to 15 kvac ? As is, it's maxed at 10 kvac. ( aprx? 14.14 kvdc? ?with a? FWB and? C input filter). I was trying to simulate

Back up! Thanks. I also deleted all the PSUD registry data as I had some Beta 3 entries. NOT recommended for everyone UNLESS you REALLY know what you are doing. - Ian

Hi Ian, If you're getting the fullwave solid state diagram as above then PSUD2 is initialising and then failing at the point at which it tries to load the default PSU which is located (typically)

Today I tried to load PSU files and always get the same layout which is the stock after install file. Beta 78 & 79 behave the same. PSU files I'm trying to load are all correct date and differ