Replacement for GET 4871 and SCR 2N4442 in Vintage PA Amp

[qsa]

Hello, does somebody know replacement with todays devices for GET 4871 and SCR 2N4442.

I cant find technical information in datasheetcatalog.com about this devices....

This Devices working in Crowbar for amplifier DC Detect

Attachment Schematic

regards

 

[pacificblue]

www.datasheetcatalog.org/datasheet/motorola/2N4444.pdf
www.datasheetcatalog.org/datasheet/boca/2N4870.pdf