Eddystone User Group

An RF earthing problem with Eddystone Receivers; article by Victor Jenkins

May 11, 2021 By: chris Category: News

Victor Jenkins, who wrote the recent excellent article on modifying the AGC system on his S940, has also written of his experiences in solving a loss of sensitivity and a tracking error on the same receiver which he tracked down to an earthing problem. His investigation and solutions make a very interesting article which he has shared with us. You can find the article in the Restoration section.



Tuning an AGC system on an S940, article by Victor Jenkins

May 01, 2021 By: chris Category: News

Recent Forum discussions have covered tuning the AGC system on older Eddystone sets and Victor Jenkins has designed a modification which enables you to select a suitable AGC decay time for different modes, i.e. Off/AM/SSB. With encouragement from Gerry O’Hara, I am pleased to reveal that Victor has produced an excellent article on his modifications which, he assures us can be removed in only a few minutes to take the set back to original form. Victor did this work on the 940 but he thinks it could also apply to other sets. The article is in the Restoration section of the website.

Rare EC10 “Seaguide” manual added to Service Manual section

April 28, 2021 By: chris Category: News

The EC10 “Seaguide” variant has been the subject of much discussion in the Eddystone User Group over the years. It was a variant of the EC10 series of receivers but badged for Marconi Marine. Graeme doesn’t mention it in the “Quick Reference Guide” so we don’t know how many were made. There are a few sets, whose existence is known about, in collections and certainly Ben has one in the Military Wireless Museum. Richard GM0OGN kindly provided us with a copy of the Instruction Manual for this set and we have added it to the Service Manual list on this website. The set has a DF facility which can be used with either a rotating loop or Bellini-Tosi fixed loop and Goniometer type antenna system. The set covers the frequency range 150kHz to 22MHz in five bands.




Sections 4 & 5 to 1650/9 service manual added

April 10, 2021 By: chris Category: News

Thanks to Alan Ainslie we have now added Sections 4 & 5 to the 1650/9 Service Manual in the Service Manual & Handbooks section of the website.



Queen Mary Radio Room and its manager Nate Brightman K6OSC (SK)

January 30, 2021 By: chris Category: News

Interesting extract from a recent California Historical Radio Society Newsletter sent in by Gerry O’Hara VE7GUH concerning the radio room on the Queen Mary, now a ship hotel in Long Beach. One of the pictures shows the Stratton built IMR54 aka as the Eddystone S700. The article is about Nate Brightman K6OSC, whom the Radio Room on the QM is named after. Nate went SK in 2016 aged 99 years. Nate operated as K6OSC for nearly 60 years and served as president of the board of directors of the Associated Radio Amateurs of Long Beach. The Queen Mary club station W6RO started operation in 1979 and Nate managed it until his retirement in 2013. The picture of the IMR54 in the EUG Quick Reference Guide produced by Graeme Wormald G3GGL (SK) is attributed to Nate Brightman. The article is reproduced with kind permission of the California Historical Radio Society and our thanks to Gerry O’Hara for finding the article and obtaining permission to add to our website in the “Eddystones in Famous Places” section.

A Merry Christmas to all our readers

December 23, 2020 By: chris Category: News

On behalf of the Eddystone User Group Admin and moderators, I wish all our friends a Very Merry Christmas. Without doubt 2020 has been a year without precedent. Last Christmas no-one could have foreseen what was ahead of us. This coronavirus has affected everyone, from mild inconvenience to the loss of income or even, sadly, the loss of a loved one. Many of our followers are of an age that is probably considered vulnerable and have had to be shielded from the rest of the world. This may have meant more free time to work on those old sets, for the website and the forum have been busy with requests for help which to a large part we have been able to satisfy. The For Sale and Wanted section of the website has been popular and we have been able to help a number of families move on loved sets.  Although our costs are very modest I am glad to say that generous donations from friends and enthusiast have helped us meet them. We all hope that 2021 and vaccinations will get the better of this dreaded virus and life can get back to what will no doubt become a new normal.

We wish you all the best and a Happy New Year but above all please stay safe.

Chris G0EYO EUG Webmaster and Administrator



Mystery Escutcheon: does anyone recognise what set this was used on?

December 22, 2020 By: chris Category: News

An Eddystone user has come across this Escutcheon which has an Eddystone lighthouse motif on it so reasonably concludes that it must have come from an Eddystone set from the 20’s or 30’s. Research in all the usual places and request on the EUG Forum have failed to come with any information. Do you recognise what set this was used on. If so contact admin Chris G0EYO on g0eyo@blueyonder.co.uk  






Factory Issued Cord Replacement Instructions for 730 series and 830/7

December 17, 2020 By: chris Category: News

There are plenty of requests for information on Eddystone Receiver Cord Replacement on the EUG Forum and we already have Gerry O’Hara’s VE7GUH Technical Short No 20 on Drive Mechanisms and Gearboxes in the Restoration section. Ian Nutt M0ECQ has found two Works procedures which he has kindly copied for inclusion on the website. These procedures cover Cord Replacement for the 730 series and for the 830/7 receiver and have been added to the Restoration section.



Article on installing a Product Detector to the S680X

November 19, 2020 By: chris Category: News

Older Eddystones do not have product detectors, so resolving SSB signals can be a bit difficult with just the BFO and adjusting the RF and AF controls. Roy Kavanagh GM4VKI has modified his S680X to incorporate a product detector and has provided a step by step write up on how to do it. You will find his article in the Restorations folder but you can download a copy from here. 




See For Sale section – Rare opportunity to purchase two S696/1 Absorption Meters with history

September 18, 2020 By: chris Category: News

Nigel G6DGR in Sutton Coldfield is helping his father-in-law Ken G3PMW dispose of his radio equipment and has discovered two rather rare Eddystone Absorption Wavemeters S696/1 complete and in wooden carrying cases, coils and calibration charts. The S696/1 was supplied with nine coils and covered the frequency range 200 kc/s to 200 Mc/s. Price in 1954: £13 10s 6d.

Ken was a Marconi TV Transmitter engineer in Chelmsford from 1950 until he retired in 1990. Ken says that these two units were bought by Marconi in 1954. They were bought just as the meters and coil sets and the boxes and aluminium graph plates were made by the company to protect them while in use. When Marconi pensioned them off, he and his pal Roy G3PMX bought one each and when Roy became SK some years ago, his unit was passed to Ken. Both Ken and Roy were members of the Chelmsford Amateur Radio Society for many years.

Go to For Sale section (right) for more details THESE HAVE NOW BEEN SOLD TO ALAN AINSLIE AT THE EDDYSTONE MUSEUM.