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| Musaphonic | |||||
| Year: 1951 | Category: Broadcast Receiver - or past WW2 Tuner | ||||
| Valves / Tubes | 5: 12BE612BA612AV650C535W4 |
|---|
| Main principle | Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s) |
|---|---|
| Tuned circuits | 6 AM circuit(s) |
| Wave bands | Broadcast only (MW). |
| Details | |
| Power type and voltage | Alternating Current supply (AC) / 105 - 120 Volt |
| Loudspeaker | Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm |
| Power out | 1 W (unknown quality) |
| from Radiomuseum.org | Model: 515F - General Electric Co. GE; |
| Material | Plastics (no bakelite or catalin) |
| Shape | Tablemodel with Clock ((Alarm-) Clock Radio). |
| Dimensions (WHD) | 11.9 x 6.2 x 4.3 inch / 302 x 157 x 109 mm |
| Notes | Color=Brown Mottle. |
| External source of data | Ernst Erb |
| Source of data | Collector's Guide to Antique Radios 4. Edition |
| Circuit diagram reference | Beitman Radio Diagrams Vol. 11, 1951 |
| Mentioned in | The Radio Collector's Directory and Price Guide 1921 - 1965 (Rider's Perpetual, Volume 22) |
| Literature/Schematics (1) | Photofact Folder, Howard W. SAMS (Date 9-51, Set 143, Folder 7) |
All listed radios etc. from General Electric Co. (GE); Bridgeport CT, Syracuse NY
Here you find 2762 models, 1930 with images and 1954 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
Hits: 893 Replies: 6 general-el: motorboating noise | |
| Steve Varadi 08.Apr.20 | 1 Anybody experiencing motorboat noise during alignment proceeding on this Radio: GE 515F? Let me know what did you do to eliminate it. Thanks: Steve |
| Dietmar Rudolph 08.Apr.20 | 2 In most cases, motorboading occurs, if the electrolyt capacitors of the B+ voltage have lost their capacity. In this model this is a dual elyt C23A & C23B, both should have 50μF. Try to solder an elyt of 47μF in parallel to C23A, and probably another in parallel to C23B. If motorboating stops, you were sure to replace C23A&B. Good luck, Dietmar |
| Steve Varadi 08.Apr.20 | 3 Hi Dietmar, I check both electrolyte (C23A, C23B) show 54.7uF, because I recap the whole system before I try to do alignment on it. Even I 'cuered' the SMD (Silver Mica Desease) as you can see in the picture. I do not see any other electrolyte cap in this Radio. If you have another tip it would highly appreciated. Steve |
| Dietmar Rudolph 08.Apr.20 | 4 Hi Steve, when recapping, often mistakes occur when the numbers on the capacitors were mis interpreted. One capacitor is critical in this sense, namely C20 (5nF). Please check its value. If C20 has to big a capacity, motorboading is very probable. This is also true for C17, which should have 2 nF. Regards, Dietmar |
| Steve Varadi 08.Apr.20 | 5 Regarding C17 and C20 they are together with C19 and C26 in one unit CERAMIC caps. I did not bother them (yet!) Now I just check C17 2.87 nF (should be 2 nF) C20 6.49 nF (instead of 5 nF) Do you think they are too high in value and worthed to replacing? I think I do not have at Home ceramic caps in those value. I want to tell you the whole story about motorboating: I followed the alignment chart, step one was ok, but when I want to do step two I get the motorboating when give the 455 kHz from my SG-8. Before I start alignment I can get two (only 2) local Station fairly clear with good volume without any motorboating noise. I hear this noise ONLY when I want to do alignment. This will help to solve the motorboating noise? Thanks: Steve |
| Dietmar Rudolph 09.Apr.20 | 6 What you are describing looks like a feedback between the generator and the radio. Please try to operate the radio via an isolating transformer. Do you use a probe tip to inject the intermediate frequency? Else you may inject in the way shown in the graphics. The ceramic capacitors look pretty o.k. Now I think, there will be no problem with them. Regards, Dietmar |
| Steve Varadi 12.Apr.20 | 7 Thank you very much for your illustration. I never put my wire loop in the cardboard, however this is a very clever idea. BTW mine loop (only in the Air without suppor by anything) is working well also. Finally I finished the Alignment and I'm satisfied with it. Here you can see and hear (33 sec.) Thanks again. Steve |
End of forum contributions about this model
Ge Clock Radio Manual
rmXorgGe Cd Clock Radio Manual
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