I have just remembered that there was a backplane for the QL called Qplaneqplane.jpg
Which allowed connection of QL expansions and powered from an AT power supply.
All expansions were required to be modified to run on 5v, which was mainly bridging the voltage regulator with a wire. Except for the Gold Card v2, v3 which inaddition to the voltage regulator bridge wire a modification to the Gold Card Clock was required, as the clock ran on 9v.
The Gold Card modification required a resistor and diode to be removed and an insulated wire joining 2 poits.
The details of the modification is detailed in the Qplane manual. Please attached PDF.
This could be the source of the modification on your Gold Card.
Thank you so much for this, this is fantastic and really helpful! I have sent the Qplane PDF link to the chap who is going to hopefully bring my card back to life. The only thing is, I could really do with knowing about which type of resistor and diode have been removed ...
@tofro - Hi again, would you by any chance be able to identify the resistor and diode in question on the back of your Gold Card please for component sourcing? I would be most grateful!!!
Thanks again Derek and tofro