Yesterday, I have left the phono (LoMC) on for a couple of hours: both channels settled at about 3.8VDC.
Today, immediately after switching on both channels measured about 6.6VDC and after about 2h settled around 4.1VDC.
Should I tweak further?
Morning. When digging for something in the hoards you often don’t find what you’re looking at the moment for but almost always you find something that you were looking for the other week but didn’t find.
When I had this 2x24 63 VA in my hand I noticed that they (I’ve got several) have a 230 and a 400 v primary. Connecting the 400 to 230 mains gives them a very easy ride and the series connected secondaries gives out a very stable 33 vac. It hardly reacts when connecting it to the FSP raw PSU loaded with 390R (almost 100 mA). The RD/Link was pre populated with 8R3.
They hand out 40,7 vdc. Is that as expected? Is it usable? I thought the rails was supposed to have 35ish (and that a 33 vac tranny would comply with that). Or is the TP between R12 and R13?
When I had this 2x24 63 VA in my hand I noticed that they (I’ve got several) have a 230 and a 400 v primary. Connecting the 400 to 230 mains gives them a very easy ride and the series connected secondaries gives out a very stable 33 vac. It hardly reacts when connecting it to the FSP raw PSU loaded with 390R (almost 100 mA). The RD/Link was pre populated with 8R3.
They hand out 40,7 vdc. Is that as expected? Is it usable? I thought the rails was supposed to have 35ish (and that a 33 vac tranny would comply with that). Or is the TP between R12 and R13?
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43V Raw DC would still be good for even less internal capacitance in the CCS Mosfet but 40.7-33=7.7V across it is already more than the 5V base difference recommended.
I rebuilt the trafos so they don’t take up so much space and will fit in the PSU form factor I have in mind.
They now has the 400 vac tap as the only primary and the dual secondaries in series.
They run almost soundless because of the many turns on the primary. Will let them cook on 2x112 mA today to see if they heat up anything at all.
They now has the 400 vac tap as the only primary and the dual secondaries in series.
They run almost soundless because of the many turns on the primary. Will let them cook on 2x112 mA today to see if they heat up anything at all.
Attachments
Trafos stopped at 5 degrees C over ambient and the comps on the raw PSU board on about the same. Great, that means that I can box it up from EMI etc pretty good.
They have a copper shield between primary and secondary that I can take straight to ground, that will suppress even more.
They have a copper shield between primary and secondary that I can take straight to ground, that will suppress even more.
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*For those not familiar here's an explanation of such shields by a heavy industry firm: https://www.maddox.com/resources/articles/electrostatic-shields
jazzbear:
Please report your reaction to the upgraded capacitors once you're confident they have been fully burned in.
I replaced Jantzen Z-Superior caps with Miflex KPCU-03 caps (plus KPCU-01 bypass caps) on the tweeter crossovers on my Elsinore loudspeakers and loved the result; the Miflex caps were expensive but unquestionably worth it.
Regards,
Scott
Please report your reaction to the upgraded capacitors once you're confident they have been fully burned in.
I replaced Jantzen Z-Superior caps with Miflex KPCU-03 caps (plus KPCU-01 bypass caps) on the tweeter crossovers on my Elsinore loudspeakers and loved the result; the Miflex caps were expensive but unquestionably worth it.
Regards,
Scott
Hi jazzbear,
Without getting into a war ... If the part doesn't fit, do not use it.
I'll be honest with everyone. The best parts are typically not "audiophile approved". In fact, they are normally modestly priced compared to audiophile parts, and they are smaller. Simple, industry parts and there are some types much better than others. It comes down to materials and construction.
You want to install audio fashion, go for it. Just don't wreck anything shoehorning parts in that don't fit.
Without getting into a war ... If the part doesn't fit, do not use it.
I'll be honest with everyone. The best parts are typically not "audiophile approved". In fact, they are normally modestly priced compared to audiophile parts, and they are smaller. Simple, industry parts and there are some types much better than others. It comes down to materials and construction.
You want to install audio fashion, go for it. Just don't wreck anything shoehorning parts in that don't fit.
Yep, Miflex are copper.
It seems to me that's another dogma.
And we all have to agree what 'best' stands for, and you know that we don't.
And to prevent another war, which it's not the place and I'm not that type, I would say that in the industry they make compromises so they spend hours hand picking parts (modestly priced as you write) that have the effect that they desire.
Not many have the skill or patience to go too deep into this endeavor so the normal suspects are chosen : the caps baby !
I would expect that Nick when did his final listening tests of UFSP had the Clarity CMRs on. For starters go for that. And Clarity is not a cottage manufacturer and yet many audiophiles praise them. I think that even Miflex did start as industrial manufacturer, a polish could enlighten us.