Radiospares Thermistor TH.1 vs TH-1A info - UK Vintage Radio Repair and Restoration Discussion Forum

robinshack · 7th Apr 2021, 4:48 pm

I wonder if anyone knows the difference between the earlier Radiospares TH.1 and the later TH-1A please. I have their 1967 catalogue listing the TH.1 as equivalent to VA1015. Res cold 930 ohm, Res hot 42 ohm @ 0.3A. The only difference I can see is the TH.1 has what looks like end caps fitted whereas my TH-1A has wires wrapped around either end. Were these onlyith the 0.3A quoted, were these used in 0.3A heater chains on tv or also as ht inrush limiters as well? Reason I ask is I have some I found when sorting.
Thanks.
Rob

ms660 · 7th Apr 2021, 5:24 pm

As a comparison with the suffix, the Brimar/STC CZ range that have the suffix A added are the same electrically, eg: CZ1 and CZ1A are electrically the same but in those the CZ1 is a wrapped wire connection and the CZ1A is an end cap and wire connection.

Lawrence.

robinshack · 8th Apr 2021, 8:41 am

Thanks Lawrence. Strange the " A" designation of wire and end caps between the 2 suppliers. Maybe RS ones were from STC.
Rob

ms660 · 8th Apr 2021, 9:10 am

Quote:

Originally Posted by robinshack

Thanks Lawrence. Strange the " A" designation of wire and end caps between the 2 suppliers. Maybe RS ones were from STC.
Rob

Out of interest, there's a note in the Brimar book to say that the CZ1A was only normally supplied to manufactures of equipment (bottom of book page 287):

https://www.rsp-italy.it/Electronics...20-%201958.pdf

Lawrence.

robinshack · 8th Apr 2021, 3:18 pm

Thanks Lawrence,
you are always a fountain of knowledge!
Rob

7th Apr 2021, 4:48 pm	#1
robinshack Octode Join Date: Jun 2010 Location: Spalding, Peterborough, Cambridgeshire, UK. Posts: 1,437	Radiospares Thermistor TH.1 vs TH-1A info I wonder if anyone knows the difference between the earlier Radiospares TH.1 and the later TH-1A please. I have their 1967 catalogue listing the TH.1 as equivalent to VA1015. Res cold 930 ohm, Res hot 42 ohm @ 0.3A. The only difference I can see is the TH.1 has what looks like end caps fitted whereas my TH-1A has wires wrapped around either end. Were these onlyith the 0.3A quoted, were these used in 0.3A heater chains on tv or also as ht inrush limiters as well? Reason I ask is I have some I found when sorting. Thanks. Rob __________________ I am also interested in and collect 00 model railway.

7th Apr 2021, 5:24 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 10,573	Re: Radiospares Thermistor TH.1 vs TH-1A info As a comparison with the suffix, the Brimar/STC CZ range that have the suffix A added are the same electrically, eg: CZ1 and CZ1A are electrically the same but in those the CZ1 is a wrapped wire connection and the CZ1A is an end cap and wire connection. Lawrence.

8th Apr 2021, 8:41 am	#3
robinshack Octode Join Date: Jun 2010 Location: Spalding, Peterborough, Cambridgeshire, UK. Posts: 1,437	Re: Radiospares Thermistor TH.1 vs TH-1A info Thanks Lawrence. Strange the " A" designation of wire and end caps between the 2 suppliers. Maybe RS ones were from STC. Rob __________________ I am also interested in and collect 00 model railway.

8th Apr 2021, 3:18 pm	#5
robinshack Octode Join Date: Jun 2010 Location: Spalding, Peterborough, Cambridgeshire, UK. Posts: 1,437	Re: Radiospares Thermistor TH.1 vs TH-1A info Thanks Lawrence, you are always a fountain of knowledge! Rob __________________ I am also interested in and collect 00 model railway.