Question about tuner gangs.
- Thread starter waggs098
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Pio1980
AK Member
Yes, standard setup for a basic AM/FM entry level tuner front end.
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darklife
Modulating Madness
Shot in the dark but.. Scott brand tuner? Looks familiar.
Anyway, yes those are your basic low capacitance AM tuner and 3 ganged FM.
You can usually tell by touching a screwdriver shaft to your bare hand (only in solid state sets, do not do this with tube sets) and touch the end to the underside of the variable trim capacitor bottom connector. If on AM you will detune it badly temporarily, on FM the same so you can narrow it down that way. Often the ones most offset by body capacitance are the ones that determine dial calibration, those less susceptible are often high trim caps dedicated to giving an even tuning linear sensitivity response.
With large variable caps like this it is usually visually obvious, but on those boxed ganged variable caps used in portable radios sometimes you have to do this to see what tuner cap you are working with, especially with their associated trimmer capacitors as often they are not so obvious.
Just don't start dicking around with trim capacitors using a metal screwdriver. Use the proper insulated tools after finding out what does what. Never EVER stick a metal hex driver into a ferrite coil hex driven variable coil unless you want the wonderful "click" and realize you snapped it in half, regardless how careful you are with taking the detuning of using such a tool in service.
Never mind me, rambling lol
Anyway, yes those are your basic low capacitance AM tuner and 3 ganged FM.
You can usually tell by touching a screwdriver shaft to your bare hand (only in solid state sets, do not do this with tube sets) and touch the end to the underside of the variable trim capacitor bottom connector. If on AM you will detune it badly temporarily, on FM the same so you can narrow it down that way. Often the ones most offset by body capacitance are the ones that determine dial calibration, those less susceptible are often high trim caps dedicated to giving an even tuning linear sensitivity response.
With large variable caps like this it is usually visually obvious, but on those boxed ganged variable caps used in portable radios sometimes you have to do this to see what tuner cap you are working with, especially with their associated trimmer capacitors as often they are not so obvious.
Just don't start dicking around with trim capacitors using a metal screwdriver. Use the proper insulated tools after finding out what does what. Never EVER stick a metal hex driver into a ferrite coil hex driven variable coil unless you want the wonderful "click" and realize you snapped it in half, regardless how careful you are with taking the detuning of using such a tool in service.
Never mind me, rambling lol
Last edited:
cubby01
aka Buck
Umm, I'm going to go with one of the Quadraflex Reference receivers just based on the screen printing on the boards.
waggs098
Super Member
Umm, I'm going to go with one of the Quadraflex Reference receivers just based on the screen printing on the boards.
It is from a Quadraflex Reference 450.
