PCB Surface Finish

[Buffalo Tom]

Hi. Im about to order my first self-designed PCB. Im using through hole components. After some searching here in the forum it seems like Elecrow is a popular manufacture so im gonna try them. https://www.elecrow.com/pcb-manufacturing.html

I need to choose between:

HASL
HASL Lead-free
ENIG (Immersion gold)
OSP

What's the "standard" surface finish for professional audio pcb's? What do you use?

[Dormammu]

Try it all. 
Jokes aside - no matter, all good enough.

[PRR]

Google

I think the differences are for cell-phone or submarine applications, pedals are not so fussy. I'd find the cheapest and see how ugly it is.

https://blog.techdesign.com/5-types-pcb-surface-finishing/

[bartimaeus]

HASL Lead-free is pretty standard.

ENIG (Immersion gold) is good if you want to charge your customers more for the "luxury" version.

But for my own use I just get HASL Lead-free. I've gotten tons of PCBs with both, and don't notice a significant difference.

[amptramp]

I wouldn't pay the extra for gold because solder forms intermetallic compounds with gold (the dreaded Purple Plague) when used with lead-tin solder.  I am not sure how it reacts with silver-tin-copper solder.  These intermetallic compounds are brittle and tend to break up with a low level of stress, making connections that have a short life before they go open.

[Buffalo Tom]

HASL Lead-free is pretty standard.

Thanks.