I think that that RP25A used a different tuner.
Hacker Super Sovereign RP75 Great Sound+12volt Rechargeable 18650 Pack+Charger
Hacker Super Sovereign Rp 75 -mb
Rare Hacker Golden Sovereign AM FM Radio
Hacker Sovereign II RP25 Early Version Vintage Radio – Goodmans Speaker – Origin
Vintage 1960's Hacker Sovereign II 2 Transistor Radio RP25 Swivel Base Untested
HACKER SOVEREIGN II RP25 TRANSISTOR RADIO VINTAGE SPARE & REPAIR
