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Old 6th May 2019, 1:43 pm   #1
stuartd
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Default Sparta Fuller Crystal Receiver- help!!!

Hi folks

Set appears complete but it has two stray wires (marked in red) which aren't connected. Should they be, and if so, to where?

Thanks
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Old 6th May 2019, 1:46 pm   #2
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Default Re: Sparta Fuller Crystal Receiver- help!!!

A picture of the other side of the board would help.
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Old 6th May 2019, 1:51 pm   #3
evingar
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Quote:
Originally Posted by stuartd View Post
Set appears complete but it has two stray wires (marked in red) which aren't connected. Should they be, and if so, to where?
Some detailed info on the set here, including a picture of the deck underside (part of the "slide show"). There seems to be some stuff missing on yours

https://physicsmuseum.uq.edu.au/sparta-crystal-radio
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Old 6th May 2019, 1:54 pm   #4
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Default Re: Sparta Fuller Crystal Receiver- help!!!

The RadioSpares variable capacitor is obviously not original.
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Old 6th May 2019, 2:01 pm   #5
stuartd
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Quote:
Originally Posted by Station X View Post
A picture of the other side of the board would help.
Sorry .... Here it is...
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Old 6th May 2019, 2:11 pm   #6
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Default Re: Sparta Fuller Crystal Receiver- help!!!

It's difficult to tell from your picture whether both coils are still present. The tuning arrangement (moving one coil relative to the other) has obviously been removed and replaced by the variable capacitor.

It looks like there are five connections to the coils, which would fit in with the original arrangement.
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Old 6th May 2019, 2:21 pm   #7
stuartd
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Thanks Graham - another view for you. I freely admit to being all at sea here
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Old 6th May 2019, 2:32 pm   #8
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Could it be that the whole tuning capacitor has done a swivel and the two wires to its connection tags have ripped off?

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Old 6th May 2019, 2:41 pm   #9
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Everything seems pretty firmly locked down
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Old 6th May 2019, 3:22 pm   #10
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Either there's another connection to the tuning capacitor that can't be seen in the photo's, or the capacitor was never connected in circuit, or the capacitor was connected in circuit by its connection tags and has, for whatever reason, (including the possibility given previously) become disconnected.

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Old 6th May 2019, 3:30 pm   #11
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Hard for me to work out what ought to be connected to where :-(
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Old 6th May 2019, 6:10 pm   #12
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Default Re: Sparta Fuller Crystal Receiver- help!!!

Given that this set has been modified it's difficult for me too, to know which wires go where. Given a bit more information I might be able suggest suitable wiring though.

Are both coils still present, perhaps the smaller diameter coil is now under the larger one, and how many wires are brought out from each coil?
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