440pF High Voltage Variable Capacitor Air Spaced for Crystal Sets, Radio Projects, or Loop Antennas Large Knob
$20.47
This is one item of used, single gang, air spaced variable capacitor recovered from an early valve radio. The maximum capacitance is 440pF and the minimum capacitance is 23pF. The large knob is included. The manufacturer is McMichael London. It has been tested for shorts and the capacitance values. The larger plate spacing will allow use at higher voltages.
Here are some example projects where you could use such a part:
Crystal Set One
https://www.interestingelectronics.com/old/henrys_interesting_electronics/loud_crystal_set_radio/loud_crystal_set_radio.htm
Crystal Set Two
https://www.interestingelectronics.com/old/henrys_interesting_electronics/crystal_radio_v2/crystal_set_radio_v2.htm
Choccy Block Crystal Set Radio Kit
https://www.usefulcomponents.com/main_contents/projects/choccy_block_crystal_radio/choccy_block_crystal_radio.html
Tuned Loop Aerial
https://www.interestingelectronics.com/old/henrys_interesting_electronics/am_radio_loop_aerial_booster/mw_lw_am_loop_aerial_antenna.htm
Superheterodyne MW AM Radio
https://www.interestingelectronics.com/old/henrys_interesting_electronics/mediumwave_radio/mediumwave_radio.htm
The Ladybird Book "Learnabout... Making a Transistor Radio." Radio
https://www.interestingelectronics.com/old/henrys_interesting_electronics/ladybird_radio/ladybird_radio.htm
Breadboard Six Transistor MW AM Radio Kit
https://www.usefulcomponents.com/main_contents/projects/breadboard_trf_radio/breadboard_trf_radio.html
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