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Rekord-Senior 60 Export

Rekord-Senior 60; Emud, Ernst Mästling (ID = 868635) Radio
 
Rekord-Senior 60; Emud, Ernst Mästling (ID = 501121) Radio
Rekord-Senior 60; Emud, Ernst Mästling (ID = 466259) Radio Rekord-Senior 60; Emud, Ernst Mästling (ID = 466260) Radio
Rekord-Senior 60; Emud, Ernst Mästling (ID = 466285) Radio Rekord-Senior 60; Emud, Ernst Mästling (ID = 466261) Radio
Rekord-Senior 60; Emud, Ernst Mästling (ID = 466262) Radio Rekord-Senior 60; Emud, Ernst Mästling (ID = 466284) Radio
Rekord-Senior 60; Emud, Ernst Mästling (ID = 858124) Radio Rekord-Senior 60; Emud, Ernst Mästling (ID = 1007932) Radio
Rekord-Senior 60; Emud, Ernst Mästling (ID = 1007933) Radio Rekord-Senior 60; Emud, Ernst Mästling (ID = 1007939) Radio
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Rekord-Senior 60; Emud, Ernst Mästling (ID = 466259) Radio
Emud, Ernst Mästling: Rekord-Senior 60 [Radio] ID = 466259 500x333
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For model Rekord-Senior 60 Export, Emud, Ernst Mästling; Ulm:
Front View
 
Country:  Germany
Manufacturer / Brand:  Emud, Ernst Mästling; Ulm
Year: 1959/1960 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: ECC85 ECH81 EF89 EABC80 EM80 EL84 EZ80
Main principle Superheterodyne (common); ZF/IF 460/10700 kHz; Export model
Tuned circuits 6 AM circuit(s)     10 FM circuit(s)
Wave bands Broadcast, Short Wave plus FM or UHF.
Details
Power type and voltage Alternating Current supply (AC)
Loudspeaker 4 Loudspeakers
Power out 6 W (unknown quality)
from Radiomuseum.org Model: Rekord-Senior 60 [Export] - Emud, Ernst Mästling; Ulm
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 530 x 320 x 250 mm / 20.9 x 12.6 x 9.8 inch
Notes

The model Emud Rekord-Senior 60 Export from Ernst Mästling, Ulm, Germany is nearly the same as the domestic version but it has no long waves. Broadcast is 550 to 1500 kc, short waves from 5.9 to 10 mc and FM from 88 - 108 mc.
Similar with German Emud model Rekord Senior 60.

Net weight (2.2 lb = 1 kg) 9.3 kg / 20 lb 7.8 oz (20.485 lb)
Literature/Schematics (1) Photofact Folder, Howard W. SAMS (Date 12-60, Set 511)
Literature/Schematics (2) -- Original-techn. papers.

Model page created by Ernst Erb. See "Data change" for further contributors.



All listed radios etc. from Emud, Ernst Mästling; Ulm
Here you find 412 models, 319 with images and 220 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Emud, Ernst Mästling: Rekord-Senior 60
Threads: 4 | Posts: 14
Hits: 1456     Replies: 0
emud: 60; Rekord-Senior
Earl Roberts
26.Apr.14
  1

I just completed a restoration of my 3rd Emud Senior 60 radio. I couldn't resist the twenty-five dollar yard sale cost. It turned out to be the most challenging restoration I've done since I bought a radio that was in a flood and was full of silt.

Electronicaly, I knew there would be a power supply problem because someone had inserted a 20 amp AGC fuse in place of the .8 that should have been there. I guess they didn't have a penny to use! :) As usual the multielemet filter cap was bad but since someone just used larger and larger fuses the power transfomer was fried, The EZ80 tube socket was arced out, the contacts in the on/off switch were burnt off and the wires leading to it were burnt toaster wire. At is point I considered cannibalization!

Fortunately, I had an old transfrmer to replace the burnt unit. So I repcapped the radio, replaced the tube socket with a ceramic one and rewired. But what to do about the on/off switch? I hated the idea of adding an external switch or inline; so I added an "L" bracket on the inside of the back of the chassis with a long lever microswitch; the lever positioned directly behind the sliding wafer board that use to hold the power contacts. There is just enough of the board protruding from the back of the push button assembly to depress the lever when the power button is actuated.

I'm happy that I didn't scrap the unit, as it turned out, I stripped off the cracked and flaking old black finish revealing a great oak veneer. Lightly sanding it and adding one coat of golden oak stain with three coats of Tung oil, the case is beautiful and the sensitivity and sound are the best of the three I have.

I wanted to share this exerience with those who may just be starting out in restoration of these great old radios. Don't get discouraged and don't be afraid to re-engineer around a problem. Once you get them back to specs they sound really great and you'll hate to turn them off and go to the next project!

 
Hits: 3086     Replies: 5
emud: 60; Rekord-Senior
Mark Saltzman
21.Nov.10
  1

Gentlemen,

While performing capacitor replacement and circuit tracing to verify connections, I noticed that the Output Transformer (OT) connections have been modified beyond recognition.  The OT looks just like other EMUD OT's I have found in the model pages, but may have undergone repair or modification during its past lifetime. 

A tone cap that should be mounted on the tone switch assembly has been moved to the OT.  I would like to re-install in its correct location, but unsure which contacts and what value to place here.   

The feedback circuit from the OT to the volume control is completely missing, all resistors and caps that should be located on the OT solder lugs are missing, and no feedback connection to the volume control.  It appears to have been connected Single Ended as the Primary CT(B+) and R39 are connected together at the OT.  I have inspected the OT and found two taps for the primary and 3 for the secondary, but it doesn't look like it has enough to make all the correct connections required by the schematic.

The photo shows the seconday winding and the some of the lug connections.

Any help in this matter would be greatly appreciated.

Attachments

Paul E. Pinyot † 2013
21.Nov.10
  2

I have this picture of the chassis from this page.  It is hard to see the parts.  But you may get an idea of how they are connected. 

The RM.org Senior 60 schematic (not the export) is clearer than your export model.  You should get an idea of the parts, values and connections if you compair the Export fuzzy schematic with eletrostatic tweaters to the Domestic clear schematic with dynamic voice coil tweaters. 

Be careful.  There is additional feedback on the EL84 Grid 2 Export version that is not on the Domestic version.

Perehaps some one else with a clean Export schematic will verify the secondary feedback resistor and capacitor values for you. 

Paul.

Mark Saltzman
22.Nov.10
  3

Mr. Pinyot,

Thank you for the reference.  In fact, I had studied your photo from your website at length before I decided to post.  BTW, your website is FANTASTIC !!!  It was your photo that allowed me to ascertain that something was amiss with the OT and related circuitry.

Although your photo was very helpful, it unfortunately does not assist me (at this point) in getting from what I have to what I should have.  The lack of a correct circuit in my hand makes it difficult for me to trace as per schematic.  As you know, failed components is one thing, but missing components, especially when placement can at times be critical, is another. 

I guess the information that I was looking for has more to do with a recognition, by fellow techs familiar with the EMUD, of what may have been accomplished by doing this or an acknowledgement of an improper OT, or production run change that is similar on other radios of the same model.

Thanks again.........still at square 1.

 

Thomas Günzel
22.Nov.10
  4

Hello Mr. Saltzman

I uploaded a schematic of the Emud Rekord Senior 60 USA-Version kindly provided by Otto Künzel.

Perhaps it helps.

Kind regards

Thomas Günzel

Paul E. Pinyot † 2013
24.Nov.10
  5

Mr. Saltzman,

I have been thinking about your situation. I often come across radios that someone has modified. One example is a Saba Frieburg 14 with automatic tuning. What a nightmare. Lots of changed values in the autotune circuit. This is what I do for just about every radio that helped me put the Frieburg back to original.

Click on the “To the model” seen above.  Mr. Günzel kindly uploaded a better clear schematic that should help you a lot. 

I print out the schematic over at least two sheets of paper. Why struggle with reading the values? (I am 52 as of last Sunday and my eye sight is not what it used to be). Your printer may have an option that allows multi page printing of a single page. Then trim and tape it together. 
 
As I go through the restoration (replace capacitor, selenium diodes, ohm out RF/IF & power transformers for continuity, valves, etc) I mark each component symbol with a red or green pencil. The red is for all parts that are bad, out of tolerance or questionable that I replace. The green is for tested good parts (i.e. IF transformers) that are kept. (I do not mark the dial lamps).
 
When I do this I am looking at the connections to see if the parts are connected as indicated in the schematic.  I always remind my self that some one may have been into the chassis before me.
 
When some circuit is miss wired I use the green pencil to trace all the good junctions and circuit paths. I stop tracing when I find a fault or missing parts and fix those problem circuits. This effort is typically limited to one valve stage (more for ham radio gear).
 
For your specific situation I suggest starting tracing at the plate of the audio output valve V5 pins 7 (plate) and 9 (grid2).  You may need to go back to V4-8 grid for all the feedback circuits.
 
Comment - Do not be surprised if the installed V5 cathode resistor R57? is the wrong value.   I find here in the US people play with that resistor (for what reasons I can only guess).  This is a great example to use current limiting devices on the mains to test the unit BEFORE any restoration efforts.  You may save a valve!
 
All this red/green tracing effort helps to systematically Un-modify the chassis and keep track of your restoration efforts all at the same time. This is real important to do with Ham Radio (amateur) gear. You should be able to identify the missing parts to your circuit through this “process of elimination”. 
 
Once identified, you then can obtain those parts and wire them back into the chassis. The worst you can do is solder them into physical positions that are not factory locations.
 
Give the marked up schematic a try,
 
Paul.

 

Mark Saltzman
24.Nov.10
  6

Mr. Gunzel and Mr. Pinyot,

I sincerely appreciate the assistance.  The new schematic appears to be clearer and has allowed me to identify the correct values within the circuit that were not quite legible in the earlier schematic.

I will trace the schematic and although I normally just mark the circuit while tracing and stop and fix what is in error, I like the two color method suggested and will try it. 

I also treat vacuum tube electronics as though it has been serviced, modified, or just plain old, and never power up until the circuit is true per the best obtainable schematic, the caps are replaced, and tubes have all been checked (initial power up with no tubes).

It was during circuit tracing that I found something wasn't correct, and referred to your photo Mr. Pinyot.  Your photo verified what my tracing had found (or NOT found) and was most helpful in this regard.  

I posted the photo of what I actually have, to see (just in the odd chance) if this was some sort of "common" mod, or if someone could visually identify something amiss with the OT as compared to a correctly wired OT.  Upon my initial inspection it appears that I am not only missing some components, but that the OT does not have the correct amount of winding taps to match the schematic.  I may just have an EMUD OT that is for another model, placed there in an effort to repair the failed original.  It appears to have no center-tap for the primary, and no feedback coil tap for the secondary.

Our methods are on the same page and I welcome the advice given.  Thank you very much.

 
Hits: 2050     Replies: 1
emud: 60; Rekord-Senior
John Phelps
25.Jan.09
  1

Hi everyone!

I am restoring an EMUD Rekord Senior 60 (US Export), and I have replaced all the paper caps and filter caps.  The radio worked well on FM, but was very sketchy on AM/SW bands.  Then all of a sudden, it totally stopped working.

I replaced all the tubes, and still nothing.  I believe its a problem with one of the IF transformers or a resistor but I am not sure.  Pilot lamps light, and tubes glow so I know they're getting power.  Does anyone have any suggestions where to look, what to look for?

Thanks for all your help!

John

Torbjörn Forsman
06.Feb.09
  2

If the radio is completely silent, not even the weakest mains hum from the speaker or scratching sounds from the volume control or band switch, then you should first check the B+ voltage, it is very likely that a short has occured somewhere (for instance, in the rectifier valve). Watch out for fuses that may have blown or get open circuit by aging, although there are no fuses according to the schematic. More than once, a radio manufacturer has found necessary to include fuses afterwards, due to authority requirements on electrical safety (in the USA, that is the UL standards).

If you have B+ voltage from the rectifier, then check that the filtered B+ for V5's screen grid and all previous stages is ok.

Switch the radio for phono or tape and check that you get hum from the speaker when putting a finger in the phono or tape jack, if so, then you know that the LF amplifier stages are working.

 
Hits: 3973     Replies: 4
emud: Rekord Senior 60--HELP!!!
John Phelps
01.Dec.08
  1


Hello all...

I'm currently working on an Emud Rekord Senior 60 (export model) and need some assitance. I've replaced the known bad/weak tubes, replaced the 3 electrolytic filter capacitors and all of the paper capacitors, and the is radio close to being electronically restored.

However, I am having a problem with the AM/SW section of the radio. FM band works fine, lots of frequency response, nice and crisp, however the frequency alignment is off about 1mHz. The problem is that both the AM & SW bands are very very low in terms of volume. Sensitivity is also not very good, as it will only pickup the local stations and even has trouble doing that. Antenna seems to be connected okay. Anybody have an idea as to if this is a tube problem or something else? I'm thinking it could be a tube though I'm not sure which one, as I wasn't able to check them all with my tester (didn't have tube data for 2 of them). I'm stumped on this one. Any help would be GREATLY appreciated!

Thanks!

John
 

Omer Suleimanagich
03.Dec.08
  2

Check to see how the radio operates with another ECH81

John Phelps
03.Dec.08
  3

Hi Omer...

Thanks for your response!  I've already replaced the ECH81, as the original was weak.  That didn't work.  Do you have any other ideas?

Thanks again!

John

Omer Suleimanagich
03.Dec.08
  4

Not looking at the schematic, check your resistors!

You should also go back, and check your connections and placement of the capacitors, as well as solder joints.

In addition, clean contacts on switches with Deoxit cleaner and then Deoxit Gold.

I'm not sure if these radios suffer from silver mica disease.

Dietmar Rudolph
06.Dec.08
  5

Hi John,

do you have the possibility of checking the IF transformers (460 KHz bandpass filters)?

Since the AM bands are weak, at least one 460 KHz circuit may be out of resonance. This is the 1st step: check the IF section.

You will need an oscilloscope and a RF signal generator. Feed the RF to the 1st grid of the ECH81(not necessary to unsolder anything, just connect to the pin.). Check the value of the voltage beginnig from the diode of EABC80 via EF89 (anode and grid) back to the anode of the ECH81. Reduce the amplitude of the generator as far as possible in order not to activate agc. 

If a resonance circuit is out of order, unsufficient amplification or an extra damping will result. 

More comfortable was the use of a wobbler for IF. The resonance curves could be seen directly, and aligning the IF filters is easy.

EMUD radios seem to be very similar, even if they have different valves, see e.g. the "Funkberater".

Best regards,

Dietmar

 
Emud, Ernst Mästling: Rekord-Senior 60
End of forum contributions about this model

  
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