Quick check RE: Murata regulator replacement for Caiman?

[HighFidelityGuy]

What voltage are you reading at the 12v regulator (pin in) with the DAC powered up?

Regards

Chris

16V

Good info Dave, cheers.
Only ever used my Gator/Caiman with my 16V linear so cant help out there.
I know that theres no whistling with film caps in place (passive mod) regardless of what PSU I used?

No probs. I too had no problem with whistling or hissing with the passive mod when everything else was the same. It only started after installing the Gator.

Hi Dave, yes, the whistling is there also with Caiman 15V supply. It's also there when cable from Caiman psu to Caiman itself is shortened to about 20cm - i've tried even that

Thanks. So it seems to me that the supply isn't the cause as the symptom is still there with different supply types and voltages. This also tallies with what Mark is saying.

This just reinforces my thoughts that it is something on the output that is loading the regulator in such a way as to cause it to go unstable

Thanks Mark. This takes things back to a suggestion I made earlier that the Elna caps near the regs may have too much ESR or may be too big. That is if they are connected to the reg output and not the input. Can anyone confirm if they are connected to the output?

If so there could be multiple possible cures:

1. Swap the Elna caps to something to a different type that doesn't cause oscillation.
2. Remove the Elna caps if they aren't needed with the Murata regs.
3. Swap the Murata regs to Dexa's as the the Elna caps may not cause them to oscillate.
4. Perhaps it's the tant caps causing the oscillation rather than the Elna lytics? So maybe swap or remove them?

What do you think Mark?