serial number 19560
serial number 19560
Roberts R24 AM-FM light brown rexine covered wood
case with wood end pieces.
Portable model with push button wave
change selection, 9 volt (PP9 or equivalent) These
batteries
should provide about 80hrs of listening for 4 hours a day at normal
volume.
Frequency Coverage: FM 87.5-108MHz MW 522- 1620kHz LW 150- 281kHz. This
model has 2 integrated circuits, 3 transistors and a 4 inch 8 ohm
speaker. It was introduced in 1983 and continued being made until 1986.
When received the radio would not switch on unless the pushbutton was held in place there were no markings on the front panel, the clear plastic beneath the slots was detached and the red pointer was absent. I found a picture on the internet and used this to construct the paper reproduction shown above and glued this to the anodised aluminium faceplate and then coated it with "Klear" water based floor polish.
The on/off switch resisted several applications of switch cleaner so
I resorted to wiring in the unused contacts on this switch. This
involved cutting a track on the printed circuit and making another
connection for two of the aerial coils which used one of the contacts.
As an initial part of this exercise I shorted the terminals with a
screwdriver blade and noted that there was quite a spark, presumably
from the inrush current to a 1000 mFd capacitor, maybe this was the
reason for the failure? The radio seems to work well enough without it
in place.
You can expect to pay in the region of �30 for a second hand one in good condition.
Circuit
board and internal power supply
This is one of two non working Roberts
radios given to me by Sabrina Mitchell who said that they had served
her well over her long married life and were just sitting in cupboards
taking up space but could not bear to chuck them away!
