13-01-2016, 04:21 PM
(13-01-2016, 11:56 AM)Crackle Wrote: This RP72 radio does not have a built in mains power supply, but it does have an oval hole in the back where a mains plug would fit. I notice both the other radios, which have a mains supply are RP72MB's.
Was the RP72 never supplied with a mains adaptor?
The "MB" stands for Mains/Battery, so the earlier set wouldn't have had the built in PSU.
However, some non-MB sets do have the opening for one. Indeed, some have the opening, but a modified plastic trim is fitted that actually blocks it. It seems that there was a "transition" from the old to the new set.
Of course, back panels do get swapped around by repairers/restorers...
The non-MB versions have a 12V DC input socket.
Nice sets. Technically very competent. But somehow, they don't quite have the same appeal for me as the earlier Sovereign II does. All that extruded aluminium would have been very expensive to tool up for, so it's a shame the screen-printing is not so robust.
Something to check for - early sets can break out into motor-boating, and the cure is to add an earth wire from the ground of the tone control PCB to the earth point on the volume control. You'll find that the later sets will have that done already, but there's a chance the earlier one might not.
And to keep the tradition alive, the new power amplifier connectors can be as unreliable as the older ones
