More what are these components? - UK Vintage Radio Repair and Restoration Discussion Forum

60 oldjohn · 21st Oct 2020, 4:16 pm

"A" is solid and measures 140mm x 20mm x 5mm a narrow copper trace runs full length under the two separate windings. Sadly one windings has a slight scratch and is OC. ?
"B" All test OC. ?
"C1" & "C2" same item, different view ?
"D" ?

John.

AC/HL · 21st Oct 2020, 4:21 pm

A could be a delay line?
B two VDRs and a spark gap.
C miniature pot?
D Thermistors.

TonyDuell · 21st Oct 2020, 4:22 pm

The bottom one of 'B' is a spark gap, probably gas-filled. It would be used to short out over-voltages on, say, a telephone line.

cmjones01 · 21st Oct 2020, 4:30 pm

The parts in 'D' look like thermistors - they're quite sought after these days. Types RA52 and RA53 ring a bell.

Chris

60 oldjohn · 21st Oct 2020, 4:32 pm

I thought bottom of B may be a spark gap it was in a bag with the other two in the picture which also measure open circuit.

John.

21st Oct 2020, 5:26 pm

A looks like an AVO resistor.

G6ONEDave · 21st Oct 2020, 5:34 pm

I think C1 & C2 are either a ceramic or possibly crystal resonator. Basing this on the SFR part number. Picture A does appear to be a twin resistor of high accuracy, from some sort of test equipment.
Dave

DerekG0VDV · 21st Oct 2020, 6:05 pm

Photo 5 second from left (leads upwards) looks like a reed switch
Derek

G6Tanuki · 21st Oct 2020, 8:07 pm

One of the 'things' in the rightmost photo looks like a form of mercury-wetted switch; the oddly-shaped bracket would suggest that it was intended to be mounted to something which was then tilted to open/close the contacts.

I remember seeing something similar used to activate a bell on the door of a shop back in the 60s.

60 oldjohn · 22nd Oct 2020, 4:15 pm

Quote:

Originally Posted by DerekG0VDV

Photo 5 second from left (leads upwards) looks like a reed switch
Derek

When I was photographing them I thought one might be a reed switch, but Everything in that picture measures as thermistor. As suggested by Chris in #4

If picture B are VDR's are they useless ? they measure open circuit at room temperature.

John.

AC/HL · 22nd Oct 2020, 4:59 pm

They do at low voltages. They will be OK.

21st Oct 2020, 4:16 pm	#1
60 oldjohn Dekatron Join Date: Dec 2004 Location: East Yorkshire, UK. Posts: 3,987	More what are these components? "A" is solid and measures 140mm x 20mm x 5mm a narrow copper trace runs full length under the two separate windings. Sadly one windings has a slight scratch and is OC. ? "B" All test OC. ? "C1" & "C2" same item, different view ? "D" ? John. Attached Thumbnails __________________ My favourite text message "I'll be there in five minutes, if not read again"

21st Oct 2020, 4:21 pm	#2
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: More what are these components? A could be a delay line? B two VDRs and a spark gap. C miniature pot? D Thermistors.

21st Oct 2020, 4:22 pm	#3
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: More what are these components? The bottom one of 'B' is a spark gap, probably gas-filled. It would be used to short out over-voltages on, say, a telephone line.

21st Oct 2020, 4:32 pm	#5
60 oldjohn Dekatron Join Date: Dec 2004 Location: East Yorkshire, UK. Posts: 3,987	Re: More what are these components? I thought bottom of B may be a spark gap it was in a bag with the other two in the picture which also measure open circuit. John. __________________ My favourite text message "I'll be there in five minutes, if not read again"

21st Oct 2020, 5:26 pm	#6
Guest Guest Posts: n/a	Re: More what are these components? A looks like an AVO resistor.

21st Oct 2020, 4:30 pm	#4
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,677	Re: More what are these components? The parts in 'D' look like thermistors - they're quite sought after these days. Types RA52 and RA53 ring a bell. Chris __________________ What's going on in the workshop? http://martin-jones.com/

21st Oct 2020, 5:34 pm	#7
G6ONEDave Octode Join Date: Dec 2019 Location: Owston Ferry, North Lincolnshire, UK. Posts: 1,701	Re: More what are these components? I think C1 & C2 are either a ceramic or possibly crystal resonator. Basing this on the SFR part number. Picture A does appear to be a twin resistor of high accuracy, from some sort of test equipment. Dave

21st Oct 2020, 6:05 pm	#8
DerekG0VDV Tetrode Join Date: Oct 2020 Location: Maldon, Essex, UK. Posts: 60	Re: More what are these components? Photo 5 second from left (leads upwards) looks like a reed switch Derek

21st Oct 2020, 8:07 pm	#9
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 13,998	Re: More what are these components? One of the 'things' in the rightmost photo looks like a form of mercury-wetted switch; the oddly-shaped bracket would suggest that it was intended to be mounted to something which was then tilted to open/close the contacts. I remember seeing something similar used to activate a bell on the door of a shop back in the 60s.

22nd Oct 2020, 4:59 pm	#11
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: More what are these components? They do at low voltages. They will be OK.