140 lbs of radio (restoration) - Page 1
Forum section: electronics / rf-microwave

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 24, 2016, 04:41:10 pm
content: Rohde&Schwarz, the EK07I am pretty shure to have a very lot of working.greetingsMartin

author: Vgkid
author_rank: Super Contributor
timestamp: September 24, 2016, 05:24:42 pm
content: Woah. That is a real beast, weighs 75% of my body weight.What is the large cylindrical structure. Looks almost like a switch, with tuning components. Except on a massive scale.

author: SeanB
author_rank: Super Contributor
timestamp: September 24, 2016, 05:30:39 pm
content: That would be the band switch, all the parts needed for each band of operation changed in one click.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 24, 2016, 07:54:07 pm
content: Quote from: SeanB on September 24, 2016, 05:30:39 pmIt is, in fact a lot of German radios from that era are built like that, and even some British and American ones too.

author: voltz
author_rank: Frequent Contributor
timestamp: September 24, 2016, 08:34:54 pm
content: Very nice

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 25, 2016, 04:12:50 pm
content: that was a workful sunday...http://www.wellenkino.de/ek07/ek07-1.AVIgreetingsMartin

author: Electro Fan
author_rank: Super Contributor
timestamp: September 25, 2016, 06:50:25 pm
content: probably not quite as pristinely beautiful as Martin's work but a good video of a similar unit in operation; check out the very cool dial rotation feature at ~1:201950s/1960s radio still impressive half a century later

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 29, 2016, 06:02:36 pm
content: the restoration is now done.4 fresh tubes and a lot of cleaning, repair of the outside case, lubrication of the mechanics.The old radio is a wonder of sensitivitygreetingsMartin

author: echap
author_rank: Contributor
timestamp: September 30, 2016, 04:22:40 pm
content: Martin - You don't mess around. A project like that would take me months. I guess I need to work harder. I have an SP600 JX-7 on the bench. It was tough just getting it on the bench. Yours is a beast! Cool rig, thanks for the pics

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 30, 2016, 05:51:33 pm
content: here are pictures from a little sheet metal problem, I am a master in that

author: Vgkid
author_rank: Super Contributor
timestamp: September 30, 2016, 06:35:10 pm
content: Nice job. That portable Tek scope is tiny compared to that radio.

author: lowimpedance
author_rank: Super Contributor
timestamp: October 01, 2016, 01:17:47 pm
content: That is a real beauty in every vintage sense both electronically and mechanically. Just look at that turret switch.Was this built for the military ?.

author: tronde
author_rank: Frequent Contributor
timestamp: October 01, 2016, 01:33:37 pm
content: Quote from: Martin.M on September 30, 2016, 05:51:33 pmI don't think anyone will complain if you share some knowledge...

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 01, 2016, 02:03:00 pm
content: EK07 was in use by the military (dark green painted version),in the embassys (with telegraph decoder unit),for listening something of the cold warfor listening the see + ships communication,by the state, post, as control receiverand some other..'There is not only the large drum, it is full of engineering.I have not opened the behind side of the rotary switch, in each of the 4 areas is a section of the rotating capacitor what makes the tuning.Each of them is full of little screws, I am not shure but think there are 32 pcs in each of the 4, to adjust the linearity of that apparatus. Of coarse silver plated, like the most parts in the radio.Some parts of the system are in seperate cases, and some of them are very special. So the control oscillator is housed in a brutal massive metal case, hermetically closed and equipped with a drying patrone.The stability is only some Hz in a hour, there is no drifting when the radio is warmed up (what can be 30 minutes or more) So the big radio can listen for a long time side band talks without any correction at the wheels.It is full of selected parts to have a enorm temperature stability, the instrument right hand is calibrated to show µV directly.The IF stage is made to grow <3dB when a signal of 0.7µV grows to 100mV, means a regulating area of > 10 up 5A strong signal directly from the neighbourship will not overrun this amazing amplifiers. The bandwith is switchable from 150Hz in steps up to 12kHz. at 12kHz it sounds great for music.It is a grandmaster of old engineering, only the best, made without saving money. So it was not possible to normal people to buy one..There are extensions from R+S:a nixie frequency counter unit,a telegraph decoder unita SSB decoder unita full remote to use the radio by the phone from long distance.When you see one anywhere get it, they are rare and still bad expensive.greetingsMartin

author: VK5RC
author_rank: Unknown
timestamp: October 03, 2016, 11:08:34 pm
content: Lovely work again Martin, that masterpiece is worthy of your efforts. Great panel work.

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 08, 2016, 12:49:48 pm
content: comming soon:* restoration of a Telefunken Radio E104kW/10 (189.6 lbs)it may be the most heavy radio of germany, made in the 60`s* restoration of a second EK07, the "green version"* restoration of the cute HFH (R+S)greetingsMartin

author: VK5RC
author_rank: Unknown
timestamp: October 09, 2016, 05:34:22 am
content: Martin I hope you haven't been lifting, moving that by yourself! That is getting seriously heavy. I read that 189 lbs doesn't include the speaker either!Is the floor of your Lab OK with the weight?Rob

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 09, 2016, 09:11:06 am
content: Hello Rob,I think the solution will be found by workinghttp://www.radiomuseum.org/r/telefunken_e104kw10e_104_kw1.htmlgreetingsMartin

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 16, 2016, 09:57:49 pm
content: there was a mistake by the pre owner, it is the brother E108Lw4 , also 190lbs of radio.The old radio can receive the SAQ directly, it starts at <10kHzthis will be a heavy metal restorationgreetingsMartin

author: VK5RC
author_rank: Unknown
timestamp: October 17, 2016, 07:33:18 am
content: Hi Martin, it looks pretty good from the photo, a bit of surface rust and dust but the front panel looks intact, doesn't look too bashed about. As it is pretty heavy has the bottom taken any bad impacts?Rob

author: N2IXK
author_rank: Frequent Contributor
timestamp: October 17, 2016, 01:11:47 pm
content: What a beautiful piece of gear! At 140# it even outweighs the famous R-390A/URR.

author: wine+dine
author_rank: Contributor
timestamp: October 24, 2016, 07:37:46 am
content: ahh ... wasn't that the one where the manual read, "The radio is portable. Using the included crate and carrying rods, it can be carried by two persons over shorter distances, and four over longer ..."Pity you can't post the smell here ...

author: AF6LJ
author_rank: Unknown
timestamp: October 25, 2016, 03:40:33 pm
content: Very Cool.

author: Martin.M
author_rank: Frequent Contributor
timestamp: November 27, 2016, 09:17:43 am
content: the big Telefunken radio is also back to life, seehttps://www.eevblog.com/forum/rf-microwave/lf-tube-radio-restoration/I think there must be a better table to hold that safety ..greetingsMartin