How does an antique radio work?
How does an antique radio work?
Most antique radios will work once the capacitors have been replaced. If it does not work then signal trace through the circuit by injecting a signal at the IF or RF, replacing resistors or occasionally a tube where needed. Old resistors have a tendency to increase in value with age.
Are vacuum tubes worth anything?
Some older Western Electric tubes unused or the original box will sometimes sell for over a thousand dollars at auction. Western Electric “Tennis Ball” tubes have glass globes about the size and shape of a tennis ball with a glass tip on the top. These numbers include 101D ($400+) and 205D ($300+).
What are the different schematic symbols?
Schematic Symbols
- Wires (Connected) This symbol represents a shared electrical connection between two components.
- Wires (Not Connected)
- DC Supply Voltage.
- Ground.
- No Connection (nc)
- Resistor.
- Capacitor, Polarized (Electrolytic)
- Light-Emitting Diode (LED)
How do you identify circuit board parts?
How to Identify Circuit Board Components
- Start by identifying the printed circuit board, or PCB.
- Identify other “nuts and bolts” electronic circuit components.
- Locate the circuit board’s battery, fuses, diodes and transistors.
- Locate the processor, or processors.
What did valves do in old radios?
Later known as the Fleming valve, the oscillation valve was developed for the purpose of rectifying radio frequency current as the detector component of radio receiver circuits.
What were old radios called?
Foxhole radios A foxhole radio is a simple crystal sets radio receiver cobbled together from whatever parts one could make (which were very few indeed) or scrounged from junked equipment.
What direction does the signal path flow in a schematic diagram?
The layout of a schematic is designed to show the function, usually with signal progressing from left to right.
Where can I find Canadian antique radio schematic?
Canadian Antique Radio Schematics – We sell Canadian Antique Radio Schematic in our Radio College of Canada (RCC) Books. (Added: 17-Oct-1999 Hits: 1678) Midwest Antique Radio Service – Schematics for American and Canadian radios manufactured between 1925 and 1962 offered at very reasonable prices.
Are the radio schematics offered here digitized?
* Schematics offered here are digitized in high resolution from early radio service series published from the late 1920’s through 1963. I stock over 500,000 schematics for hundreds of manufacturers. Each radio schematic is digitized individually and checked to provide the clearest diagram possible from the original printing.
Where can I find schematics for old tube amplifiers?
Schematic downloads (pre 1970s) are available for radios, tape recorders, record players, PA amplifiers, and more from many service sources. I also stock vintage tube amplifier schematics and Photofact service manuals from 1946 through 1963 available via download, and original Photofacts from 1946 through 1970 via US Mail.
What is antique automobile radio repair?
(Added: 26-Aug-2001 Hits: 1184) Antique Automobile Radio Repair – We repair antique automobile radios and offer automobile radio schematics from the 1930’s through the 80’s. (Added: 25-Apr-2000 Hits: 1339)