One of the tuning stages within the transmitter had a broken core so I turned this over and adjusted it with an improvised trimmer tool from a piece of plastic I had lying about, this has brought the transmitter up to a suitable output and the 10dB switch does attenuate the signal as it is meant to do, though the default position on the Uniden Uniace 100 is in fact the low power mode, for high power it requires you push the switch in.
With the transmitter now operational my next job is to replace all of the usual suspect capacitors with new ones and any other capacitors that need to be replaced, these are normally electrolytic capacitors, and with the radio at least 41 years old it would be prudent to change them.
All repairs carried out so far have involved traditional 60/40 tin/lead solder for any soldering work as this is what would have been used by Uniden in 1981 as the powers that be hadn't outlawed lead solder in consumer electronics at that point.
Once the capacitors are done the radio will be subjected to a full retune of both transmitter and receiver as changing them may effect the tuning
I hope this set can give another 41 years of service, who knows, it may outlast me!
73 de M0WNU/26CT730