[sdiy] ARP Pro Soloist repair needs SN74148 IC..

[Jean-Pierre Desrochers]

I am refurbishing a vintage 1976 ARP Pro Soloist and
everything goes well so far.
But when removing all socketed TTL IC's one after each other
to 'clean' their pins before putting them back in their sockets
I noticed one of them had 3 of its pins rusted down very badly and 
falling off..
So I have to replace it.

Looking at the service manual:
http://www.synthfool.com/docs/Arp/ARP_Pro_Soloist-Service_Manual.pdf
pages 54, 55 It's one of the 2 Priority Encoders 10 to 4 Line SN74148 
(Z1 & Z2).

These chips scan many of the presets rocker switches.
My question is can I replace the original SN74148 for 74LS148 ?
The former is very old and almost gone (unless bought at eBay).
So far I found 5 x 74LS148 at a local electronic parts dealer
and I think that they will do but I want to make sure with you guys.
In the past I replaced many SN74xxx for 74LSxxx but these
were in TTL to TTL connections boards.
Here its input impedance issues (switches with pullups) I'm aware of..

Thanks.