|
Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
|
Thread Tools |
6th May 2019, 1:43 pm | #1 |
Retired Dormant Member
Join Date: May 2019
Location: Glasgow, Scotland, UK.
Posts: 5
|
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 |
6th May 2019, 1:46 pm | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
|
Re: Sparta Fuller Crystal Receiver- help!!!
A picture of the other side of the board would help.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
6th May 2019, 1:51 pm | #3 | |
Octode
Join Date: Oct 2003
Location: Newbury, Berkshire, UK.
Posts: 1,770
|
Re: Sparta Fuller Crystal Receiver- help!!!
Quote:
https://physicsmuseum.uq.edu.au/sparta-crystal-radio
__________________
Chris |
|
6th May 2019, 1:54 pm | #4 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
|
Re: Sparta Fuller Crystal Receiver- help!!!
The RadioSpares variable capacitor is obviously not original.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
6th May 2019, 2:01 pm | #5 |
Retired Dormant Member
Join Date: May 2019
Location: Glasgow, Scotland, UK.
Posts: 5
|
Re: Sparta Fuller Crystal Receiver- help!!!
Sorry .... Here it is...
|
6th May 2019, 2:11 pm | #6 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
|
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.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
6th May 2019, 2:21 pm | #7 |
Retired Dormant Member
Join Date: May 2019
Location: Glasgow, Scotland, UK.
Posts: 5
|
Re: Sparta Fuller Crystal Receiver- help!!!
Thanks Graham - another view for you. I freely admit to being all at sea here
|
6th May 2019, 2:32 pm | #8 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
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?
Lawrence. |
6th May 2019, 2:41 pm | #9 |
Retired Dormant Member
Join Date: May 2019
Location: Glasgow, Scotland, UK.
Posts: 5
|
Re: Sparta Fuller Crystal Receiver- help!!!
Everything seems pretty firmly locked down
|
6th May 2019, 3:22 pm | #10 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
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.
Lawrence. |
6th May 2019, 3:30 pm | #11 |
Retired Dormant Member
Join Date: May 2019
Location: Glasgow, Scotland, UK.
Posts: 5
|
Re: Sparta Fuller Crystal Receiver- help!!!
Hard for me to work out what ought to be connected to where :-(
|
6th May 2019, 6:10 pm | #12 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
|
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?
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |