Soldering issues - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

broadgage · 27th Oct 2019, 1:03 pm

Probably yes.

Skywave · 27th Oct 2019, 1:56 pm

In the past, when televisions were made using valves, there was often a large, high-power dropper resistor fitted, usually near the top of a vertical panel. It was common to find a section of that dropper was O/C, so a high-power resistor was commonly used to bridge that O/C section, secured with 40 / 60 solder, a.k.a. HMP (high melting point) solder.

Al.

Andrew B · 27th Oct 2019, 2:29 pm

Quote:

so a high-power resistor was commonly used to bridge that O/C section

Even then, the joints used to go "pasty" sat on top of the mains dropper, they used to fix the jumper resistor by binding it with 5A fusewire to try an hold them in place and using plumbers solder, still a marginal connection at best. Silver solder would have been better (700c melting point)

John10b · 27th Oct 2019, 7:57 pm

Yes those droppers always gave us problems and we tried various techniques usually fuse wire and nuts and bolts, if practical.
Cheers
John

Skywave · 27th Oct 2019, 11:53 pm

Ha! Those last two posts bring back all sorts on memories - and not all good ones!

Al.

Levente · 28th Oct 2019, 6:00 pm

Thank you guys for the suggestions and answers....

got the 60/40... night and day. i have learned again something, and thanks for YOU and this forum...

Really appreciate it!

27th Oct 2019, 1:03 pm	#21
broadgage Nonode Join Date: Jan 2010 Location: North Somerset, UK. Posts: 2,129	Re: Soldering issues Probably yes.

27th Oct 2019, 1:56 pm	#22
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: Soldering issues In the past, when televisions were made using valves, there was often a large, high-power dropper resistor fitted, usually near the top of a vertical panel. It was common to find a section of that dropper was O/C, so a high-power resistor was commonly used to bridge that O/C section, secured with 40 / 60 solder, a.k.a. HMP (high melting point) solder. Al.

27th Oct 2019, 7:57 pm	#24
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Soldering issues Yes those droppers always gave us problems and we tried various techniques usually fuse wire and nuts and bolts, if practical. Cheers John

27th Oct 2019, 11:53 pm	#25
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: Soldering issues Ha! Those last two posts bring back all sorts on memories - and not all good ones! Al.

28th Oct 2019, 6:00 pm	#26
Levente Hexode Join Date: Nov 2016 Location: Budapest, Hungary Posts: 386	Re: Soldering issues Thank you guys for the suggestions and answers.... got the 60/40... night and day. i have learned again something, and thanks for YOU and this forum... Really appreciate it!