Brief introduction. I maintain The Eddystone Collection and Archive, this being the combination of three important Eddystone Collections. I had a large but...
Hello, Can anyone with a 770R tell me how many grub screws are used to fix the wavechange knob please. On mine I've removed one screw but the other two holes...
G3TTP, As well as thegrub screw there is a tapered pin through the knob and shaft (look carefully and you will see one end is smaller than the other). Use a ...
I recently repaired an S940 that has an HT current draw that is on the high side: even increasing the two HT surge limiting resistors (between the transformer...
Hello Gerry, I've had a glitch on my e-mail so I don't know if my message reached you. So I'll send it again! Re the cascode on the 940, did you see and apply...
Hello Graeme, many thanks for replying to my post. Yes, I have read the 'Cascode Catastrophe' article and I have replaced all the V1 stage passive components...
Hello Gerry, I've spoken to Bill Cooke (who designed the 940) and he says the mains tranny is good for at least a 15% overload, and that the set proved very...
Graham, for your info, Mike Hi Gerry I re-measured the volts across R8 and R15 as you requested and also included V9 for completion. I also measured everything...
Many thanks Graeme. Good advice from Bill regarding letting the fault develop, though my main concern is damaging the mains transformer (exact replacements...
Graeme, Another thought: by using the voltage info on the circuit diagram (HT1 at 240v, 'cold' end of R8 at 165v) and the resistance values, the current draw...
OK Gerry, yes, it does measure up more like, doesn't it? Bill kept repeating to me to tell you not to worry. He said he built plenty of safety margin into...
Hello I have just bought a 770R mkII /12 that I´m going to restore. The main problem just now is that I need a manual for this receiver. Is there anybody who...
Hello Jan, You should be able to obtain a handbook for your 770R MkII/12 from Ted Moore, G7AIR, at 21, Prince Street, Wisbech, Cambs, PY13 2AY. Telephone (UK)...
Jan, Let me know if you do not get the manual for the 770R MkII. I have a copy and can photocopy it for you. There is not much difference from the Mk1 manual ...
Hello Jan, One important point with the 770R Mkll, you must have a shorting plug in the co-axial socket for the Pan-Adaptor, if you are not using a ...
Skip Green K7yoo/V31ch left a message on the EUG website guest book looking for any technical information on the S meter accessory Model 669. Does anyone have...
See Lighthouse Issue 95, pp10-11 (includes circuit) and my 'Eddystone Inspired' S-Meter for my S.740 article, also, the Quick Reference Guide p56 (all...
The GEX34 was/is a Germanium Point Contact Diode usually used as a Detector and etc., The AA119 was the Mullard equivalent. An OA91 would be a modern...
Thanks for the info. about the diode GEX43. And ... another one! Can I use the same OA91 insted of the GEX13 ???, or there are a better substitution? Thanking...
I thought the following mail string discussion on S.659/S.670 would be of interest to Forum members. The original question was recently posted on the EUG site...
Phil Hopewell left this message on our guest book this morning. Anyone able to give him good advice? "Great site,much useful info.I have just recently required...
I believe this to be the transistorised 230-870MHz set equivalent to 990% 25-230MHz VHF set. I have had one for some time. I have not played with it much. The...
Hi, This set doesn't have a power lead. I went to my father in laws yesterday and we searched high and low and couldn't find it. Mind you, I did find an old...
Greetings! The connector for the 670 (for that is what it is) has not been available for years. The best way to deal with it is to carefully remove the...
My Eddystone collection stared out with a 730/4, and I also have a 750. It seems reasonable to assume that the 750 dual conversion technology would have been...
Hello Chris, The 730/4 cost four times the price of the 750, so that's no reason! The 750 was adopted by Marconi as a land station Rx called HR100. A bit of a...
