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Can't connect to database, trying again.... If at first you don't succeed... - GStew - Computer Audio Asylum

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If at first you don't succeed...

After living with the P4 powered from my 'dirty' AC line and liking it, I set out to modify my fully-linear supply this weekend to have two AC cords instead of using my old linear-hybrid supply to power my P4.

Did that Saturday evening. Didn't sound good... flat, lifeless, a bit harsh. I let it warm up a bit, but it never came on-song.

I was puzzled on this one. I used the power cord and fuse-holder from my linear-hybrid and just added it onto the fully-linear. I did swap the AC cords between the P4 and the ATX-20. Even though the cords are different sections of an aftermarket cord I cut up, the plug on the one from the linear-hybrid might be better (it was the one that came on the aftermarket cord, the other was a Lowes-special), so I put it on the ATX-20 supplies and used the other for the P4.

Only other significant difference is that the linear-hybrid uses the MSR860 diodes and the fully-linear the DSEP30-06A's, which I had preferred when I was getting the fully-linear running (I did swap between the two at one point).

So this morning, I swapped the AC cords between the two supplies and took extra care to make sure all the solder joints were good. Put the fully-linear supply back in and I could tell immediately (no warmup) that the issue was solved.

I was prepared to swap out the diodes on the P4 supply too, but there's no need. Actually, the sound is a little better now than using the linear-hybrid's P4... a tiny bit more transparent and dynamic. I attribute that to the DSEP30-06A diodes in the P4 AND to having one less transformer powered up (I never disconnected the P4 power supply on the fully-linear supply when I was comparing, just swapped between the two P4s).

Dunno... might have been the AC plugs, might have been a bad solder joint (although none of them looked suspect).

In any case, I am very comfortable in saying that even with a high-test linear supply, the P4 is better powered from your 'dirty' AC line as recommended by cics.

Because of fiddling with this, I haven't had a chance to try the LT3080 regulators in more positions... likely later this week. I have the LT3080 regs made up and ready to install, but instead spent the rest of my 'audio' time this weekend working on a new set of raw DC supplies for another Juli@ & a not-yet-installed Buffalo-II DAC. Both will be using shunt-regulated supplies which like a couple of volts more headroom than I have in my current setup.

Later!

Greg in Mississippi
Everything matters!



Edits: 08/22/10

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  • If at first you don't succeed... - GStew 19:01:26 08/22/10 (0)

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