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Edit: just looking at that photo, do I need to think about whether the seat stay is vented? That seat stay will have a brazed on cap right? If the frame I'm trying to fix is the same, is there much chance I melt that braze or would it have been done with higher temp stuff?
If you're just brazing the seat stay onto the side of the seatpost lug then venting isn't an issue. The seat stay may have a brazed on cap, or it may have a top eye fitted - a big cast braze-on fitted to the end of the seatstay like one of these:
If it's a top eye then you should be fine with brass. If it's a thin plate brazed on the end of the seat stay then I'd suggest using silver rather than brass to reattach the seatstay - the lower working temperature will ensure the end plate isn't affected.
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Brommers
M_Vatwork
Sorry I've no pictures of the actual frame but we realised last night that on my mate's frame the non drive side seat stay hase come away at the seat cluster.
It's this style (albeit not quite as nice a frame as this!)
I have mapp, I have sifbronze, I have boric acid powder as recommended by @coldharbour.
Likelihood I can make an effective repair?
Anything I need to think about?
The area is painted so will need to get that off (owner is ok with paintwork getting shafted), will remove the seatpost, just try and get some braze right in there then build up a bit of a fillet?
Edit: just looking at that photo, do I need to think about whether the seat stay is vented? That seat stay will have a brazed on cap right? If the frame I'm trying to fix is the same, is there much chance I melt that braze or would it have been done with higher temp stuff?