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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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9th Oct 2021, 4:32 pm | #81 |
Heptode
Join Date: Jan 2008
Location: Shrewsbury, Shropshire, UK.
Posts: 841
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Re: Eddystone 750 wreck
Congratulations, a lot of hard work & perseverance, but a really great result.
I also have a 750 stored away that I keep meaning to start on. Mine's a 'one-owner from-new', so I'm fortunate in that respect, - I got it from a house-clearance. There is even an original letter inside from Stratton & Co. , referring to a replacement volume control fitted by them. I've just ordered some steel fishing line to replace the broken drive-cord, so the fun will no doubt start! David. |
9th Oct 2021, 8:24 pm | #82 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Eddystone 750 wreck
You will have to lift the band 1 coils in the RF box to replace the Hunts used for AGC decoupling and any others you feel inclined to do. There are a couple of other Hunts and the two small rat turds used as LT decoupling.
The 2nd oscillator box contains 3 Hunts, two for LT decoupling and one for anode feed decoupling. The BFO box also contains three suspect capacitors (black) similarly used for decoupling. The 0.1uF bolt down capacitors all tested leaky so I just replaced them all. The square capacitors tested OK but I replaced a couple as they were coupling capacitors. I checked all resistors and replaced those out of tolerance. The HT voltage measured too high, enough to overheat the VR150, in part due to my mains voltage of 248V. I used a 24V bucking transformer to bring it down to a more reasonable figure. I made brass brackets for the 0.1uF capacitors but I see other restorers have just soldered them to the nearest earth tag. I don't regret doing the full restoration in one hit as you won't want to fault find and fix as you go as these sets were not designed with the service engineer in mind |
9th Oct 2021, 9:06 pm | #83 |
Heptode
Join Date: Apr 2015
Location: Manchester, UK.
Posts: 711
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Re: Eddystone 750 wreck
Your hard work has paid off looks the business now.
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17th Oct 2021, 8:26 pm | #84 |
Hexode
Join Date: Apr 2017
Location: Buderim, Queensland, Australia.
Posts: 428
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Re: Eddystone 750 wreck
Congratulations.
Very interesting read. I am starting today to assist just a little with restoration and alignment of a 750. |