MAVIS preamp

[RuudNL]

(Ex) Neve designer Geoff Tanner about tantalium capacitors:

"Personally, I love tantalum capacitors, especially as timing or input coupling. They only suck at power supply decoupling like on the 54 consoles. I recall David Rees telling me, years back, that if he saw a bunch of tantalums on a pcb it showed him that the designer had spared no expense at creating the design of the pcb. Also, when I used to work on repairing Neve modules and some looney had replaced the tants with radial electrolytics... you could hear the difference and it wasn't for the better."

 

[mutetourettes]

well well - i suppose this is one of those suck it and see scenarios. Mavis is already equipped with quite a few tant coupling caps in the audio path between various stages, so maybe I'll try using one of those for the output. Incidentally, I don't really know yet if there is any DC on any of the outs (there are 8 outs in all) so it might all be by the by, but again, maybe belt and braces?

 

[mutetourettes]

another thing to check:

standard phantom resistors E192 series 0.1% 6k81 - give 48v / (6810r/2) = 14mA

If I'm planning to run a quick and dirty half-arsed phantom supply from the same 30v supply as the rest of the strip then I'd want:
30v / (4285r/2) = 14mA - so that would be an E192 value of 4k27 right?

I'm planning to put a high efficiency LED in there too like this circuit: http://www.groupdiy.com/index.php?topic=17809.msg207740#msg207740