Restoration of an Eddystone S.750 - The section you are trying to ...

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the set look ok and work mechanically. I suddenly had cold-flushes thinking negativethoughts like ‘what if the mains transformer is duff?’....1718Safety Testing and Preliminary Electronic Restoration- I decided to start work on the electronics with the front panel still removed from thechassis (photo 19) as this made access to underneath the chassis front much easier: useful10
if one or more of the gain controls, BFO variable capacitor or switches needed to bereplaced or serviced.- On arrival, themains transformerhad a piece ofbare wire shovedinto the 110vtapping socket. Ireplaced this withthe correct type ofinsulated jumper(for some reason Ihad one in myjunk box).19- Installed aquick-blow in-linemains fuse in thepsu compartment.Also, installed a 250mA slow-blow fuse in a chassis-mounted fuseholder wired into themains transformer secondary centre tap (it had a 3 amp fast blow installed on arrival).- Checked the general electrical safety of the psu unit – checking for loose wires, poorinsulation etc. Replaced a pair of wires who’s insulation had been heat-damaged by thestabilizer dropper resistor and re-dressed them to avoid it happening again.- Installed a new mains lead and chassis grommet, using a plastic cable-tie to retain thelead.- I made a replacement dial lamp holder to replace the bodged screw-thread one andreplaced the long-bulb #47 dial lamps (pretty standard in US and Canada radios) with thecorrect small globe-type bulbs (the long-bulb #47 lamps interfered with the drive cord).20- I noticed that both the AF and IF gainpots were non-original components: the IFgain was a 10kohm linear carbon track unitand needed to be replaced with a wirewound (ww) unit as it carries a small DCcurrent – carbon tracks don’t like that. A‘period’ Colvern ww pot was found in myjunk box (ex-Blue Streak I think) – ittested ok and was fitted (photo 20). TheAF gain pot tested intermittent, as well ashaving a cracked front plate, so that wasalso replaced with another ‘period’ unit11
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Page 3 and 4: a baseball bat). Worse, it was obvi
Page 6 and 7: is not too bad, with only a slight
Page 8 and 9: Eddystone logo (photo 13) by unscre
Page 12 and 13: (250kohm log pot), this time recove
Page 14 and 15: stations, so I decided to attempt a
Page 16 and 17: - At this point I would have ‘box
Page 18 and 19: 1826
Page 20 and 21: EUG Newsletter/Lighthouse (from ‘
Page 22 and 23: 29‘Bath Tub fresh?’ - almost…

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