Ekco AD75 questions - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Robert Darwent · 15th Nov 2021, 9:18 pm

Quote:

Originally Posted by David G4EBT

I don't know where the attached AD75 dial scan came from...

That's my handiwork David.

Take a look here: http://www.wavesintheair.co.uk/ad75-c.html

David G4EBT · 15th Nov 2021, 11:43 pm

Quote:

Originally Posted by Robert Darwent

Quote:

Originally Posted by David G4EBT

I don't know where the attached AD75 dial scan came from...

That's my handiwork David.

Take a look here: http://www.wavesintheair.co.uk/ad75-c.html

No surprises there then Robert - top notch artwork, as with the circular dials - I might have guessed!

Respect!

stevehertz · 19th Nov 2021, 1:44 pm

I have an update and a new question.

Question: I noticed a cut off green wire coming up through the chassis next to the output transformer and accompanying two other wires going to it. Tracing the green wire back it goes via other points to the 'E' connection on the back of the set - NB this is not chassis. I'm guessing that it was supposed to connect to the OPT maybe? There doesn't appear to be a connection where this should go, so...?

Regarding the warped dial scale, the heating and clamping procedure made a lot of difference as previous posts show. However once refitted there was still a slight gap down each side of the scale as viewed from the front of the set. Liveable with, but easily fixed. I found an old hinge part (see photo) and after cutting it down into two pieces and reshaping them, used them to clamp down the lifted areas at each end of the scale. No drastic 'modding', just a narrow strip of metal held in place using the dial scale's existing 6BA mounting bolts. I doubt very much that the metal reinforcement would have worked alone with the amount of warp in the scale as in its original state, it needed the heat and clamping procedure to reduce this first.

stevehertz · 23rd Nov 2021, 4:31 pm

I've put the set back together now, here's some photos showing the revived dial scale, much cleaner and no longer warped. Thanks to all for the useful advice.

Any ideas anyone re the severed wire in post 23?

ms660 · 23rd Nov 2021, 4:46 pm

Quote:

Originally Posted by stevehertz

Any ideas anyone re the severed wire in post 23?

According to the schematic in the Trader sheet one side of the output transformer secondary and loudspeaker connects to the external Earth socket.

Lawrence.

stevehertz · 24th Nov 2021, 10:38 am

Thanks Lawrence. Well, it's all put back together now and working perfectly - dangerous, famous last words.. Anyway, it must have been cut for a good reason or the set simply would not work. Time will tell.

19th Nov 2021, 1:44 pm	#23
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Re: Ekco AD75 questions I have an update and a new question. Question: I noticed a cut off green wire coming up through the chassis next to the output transformer and accompanying two other wires going to it. Tracing the green wire back it goes via other points to the 'E' connection on the back of the set - NB this is not chassis. I'm guessing that it was supposed to connect to the OPT maybe? There doesn't appear to be a connection where this should go, so...? Regarding the warped dial scale, the heating and clamping procedure made a lot of difference as previous posts show. However once refitted there was still a slight gap down each side of the scale as viewed from the front of the set. Liveable with, but easily fixed. I found an old hinge part (see photo) and after cutting it down into two pieces and reshaping them, used them to clamp down the lifted areas at each end of the scale. No drastic 'modding', just a narrow strip of metal held in place using the dial scale's existing 6BA mounting bolts. I doubt very much that the metal reinforcement would have worked alone with the amount of warp in the scale as in its original state, it needed the heat and clamping procedure to reduce this first. Attached Thumbnails __________________ A digital radio is the latest thing, but a vintage wireless is forever..

23rd Nov 2021, 4:31 pm	#24
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Re: Ekco AD75 questions I've put the set back together now, here's some photos showing the revived dial scale, much cleaner and no longer warped. Thanks to all for the useful advice. Any ideas anyone re the severed wire in post 23? Attached Thumbnails __________________ A digital radio is the latest thing, but a vintage wireless is forever..

24th Nov 2021, 10:38 am	#26
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Re: Ekco AD75 questions Thanks Lawrence. Well, it's all put back together now and working perfectly - dangerous, famous last words.. Anyway, it must have been cut for a good reason or the set simply would not work. Time will tell. __________________ A digital radio is the latest thing, but a vintage wireless is forever..