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This is one item of used, single gang, air spaced variable capacitor recovered from a valve radio. The actual item is shown. The maximum capacitance is 600pF and the minimum capacitance is 15pF. It has been tested for shorts and the capacitance values. The turning shaft is 20mm long and 0.25" 6.3mm diameter.
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
600pF Variable Capacitor Air Spaced for Crystal Sets, Radio Projects, or Loop Antennas
£14.90
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