K-20
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Brand
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International | ||||
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| Year: 1928 | Category: Broadcast Receiver - or past WW2 Tuner | ||||
| Valves / Tubes | 7: 26 26 26 27 26 71A 80 |
| Main principle | TRF without regeneration |
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| Tuned circuits | 4 AM circuit(s) |
| Wave bands | Broadcast only (MW). |
| Details | |
| Power type and voltage | Alternating Current supply (AC) / 110 Volt |
| Loudspeaker | - For headphones or amp. |
| Power out | |
| from Radiomuseum.org | Model: K-20 - Kolster; USA |
| Material | Wooden case |
| Shape | Tablemodel, with any shape - general. |
| Notes | One dial (primary tuning control knob) |
| Price in first year of sale | 135.00 $ |
| External source of data | Ernst Erb |
| Source of data | Radio Collector`s Guide 1921-1932 |
| Circuit diagram reference | Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931) |
| Mentioned in | Collector's Guide to Antique Radios 4. Edition |
| Literature/Schematics (1) | Beitman Radio Diagrams, Vol. 01, 1926-1938 |
All listed radios etc. from Kolster; USA
Here you find 101 models, 46 with images and 67 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
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Hits: 1768 Replies: 1
kolster-br: ; K-20
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Robert Heimbueger
25.Jan.11 |
1
Hi Folks, I have a Kolster K-20 with a metal casting wheel on the tuning capacitor shaft. It's about 3 inches diameter to receive the dial cord and a tensioning spring. In this case the wheel has some fractures, but is still whole. I'm wondering if I should apply a sealer or adhesive to this to help stabilize the metal before I attempt to apply the dial cord. Do you have a suggestion for such a material? The fractures are very fine, so a sealer would have to be low viscosity. I also hoped to perform this without dismantling the capacitor shaft. I'm not sure that dismantling is possible, but it would certainly take a lot of time and care.
Thanks for the help, Bob Heimbueger |
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Alan Scott Douglas † 16.11.15
26.Jan.11 |
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Pot metal oxidizes at the grain boundaries in some alloys, and there's not much that can be done about it. An adhesive might add a little strength, but it would have to be one that cures with no volumetric change, which eliminates anything in a solvent. Some epoxies or cynoacrylates might work, but I've never seen anyone report on using such materials, so you would be experimenting. It's easier to do nothing. That also leaves the option to do something in the future, if necessary. |
End of forum contributions about this model
