K105 Ch= RC-476
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alternative name
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RCA Manufacturing || Victor Talking Machine | ||||
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| Year: 1939 | Category: Broadcast Receiver - or past WW2 Tuner | ||||
| Valves / Tubes | 10: 6SK7 6SA7 6SK7 6H6 6U5 or 6G5 6SF5 6SF5 6F6G 6F6G 5U4G |
| Main principle | Superhet with RF-stage; ZF/IF 455 kHz |
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| Wave bands | Broadcast, Short Wave(s) and Police. |
| Details | |
| Power type and voltage | Alternating Current supply (AC) |
| Loudspeaker | Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 12 inch = 30.5 cm |
| Power out | 10 W (unknown quality) |
| from Radiomuseum.org | Model: K105 Ch= RC-476 - RCA RCA Victor Co. Inc.; New |
| Material | Wooden case |
| Shape | Console with Push Buttons. |
| Dimensions (WHD) | 30.5 x 43 x 14.5 inch / 775 x 1092 x 368 mm |
| Notes | This model has 3 power supply ratings: Rating A...105-125V, 50-60 Cycles Rating B...105-125V, 25-60 Cycles Rating C...100-130;140-160;195-250V, 40-60 Cycles |
| Net weight (2.2 lb = 1 kg) | 83 lb (83 lb 0 oz) / 37.682 kg |
| Price in first year of sale | 99.95 USD |
| External source of data | Ernst Erb |
| Source of data | Collector's Guide to Antique Radios 4. Edition |
| Circuit diagram reference | Rider's Perpetual, Volume 11 = ca. 1940 and before |
| Mentioned in | Guide to Old Radios |
| Literature/Schematics (1) | Pre-War Consoles |
| Literature/Schematics (2) | RCA Victor Service Notes "Red Book" Series |
All listed radios etc. from RCA (RCA Victor Co. Inc.); New York (NY)
Here you find 4928 models, 2897 with images and 4002 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
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Hits: 855 Replies: 2
rca: wattage of bias resistors in RCA K105
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Gary Streeter
15.Jun.17 |
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Does anyone have information or ideas or recommendations for what watt the biasing resistors in this RCA K105 might typically use? The schematic shows the ohms but not the watts. Can anyone help? Thank you. Gary |
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Paul Reid
19.Jun.17 |
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P = V^2/R Voltages can be squinted from rca_k105_sch.pdf (not rca_k105_sch1.pdf) Bias voltage not there(?) but can be guessed from book data. R19 3,000r 153V: 7.8W (use 15W or 20W) R20 2,500r 92V: 3.4W (use 7W or 10W) R21 10r 1.5V: 0.225W (use 1/2W) R22 170r 24.5V: 3.6W (use 7W or 10W)
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Gary Streeter
21.Jun.17 |
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Thank you! This will be helpful. The schematic we have does not show any values for wattage, and it's been guesswork! |
End of forum contributions about this model
