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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 29th Oct 2020, 6:09 pm   #1
HoraceBatchelor
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Default Bush vhf70

Hello everyone, for the last couple of weeks I 've been working on a little restoration work on a Bush vhf70, got it looking great, and it really does sound ok. Then just before putting it back in its cabinet, one last job. Change that tatty looking flex. Done, now give it a final trial. The next few sentences have been left out in case I may offend someone. You're right, after sounding fab, it's stopped working. I'm finding it very hard not to "let rip" and tell you what I'm really thinking but for fear of getting banned I wont....

The on off switch is the culprit it seems. Can anyone help me out. With either having one in a drawer somewhere that's going spare, or knowing where I can pick one up. Or maybe advice on any alternative switch that will do the job just as well. I will be much obliged, even if it's only someone showing me some sympathy.

I know I won't be the first to experience this sort of thing and I certainly won't be the last. But why do the gremlins work in this way?
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Old 29th Oct 2020, 6:16 pm   #2
astral highway
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Default Re: Bush vhf70

Gremlins ! You’ve got to love them.

Have you tried cleaning the switch contacts with a suitable solvent? Even if it’s enclosed you can usually get something where it’s needed.

And are you sure of the integrity of your connections?
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Old 29th Oct 2020, 7:11 pm   #3
Techman
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Default Re: Bush vhf70

Probably just one of the pole contacts gone o/c. It may recover if you can get some Servisol 10 switch cleaner into it. Failing that, just have it as a single pole switch and arrange it so that the remaining good pole switches the 'live' only and hard wire the neutral.

You can probably buy a new replacement from one of the usual suppliers.
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Old 29th Oct 2020, 8:15 pm   #4
Nuvistor
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Default Re: Bush vhf70

Bowood have controls. The manual states it is semi-log, the Bowood ones are log , not sure if it would make any difference worth noting.
https://www.bowood-electronics.co.uk...-log-switched/
Choose the correct value 470k.
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Old 29th Oct 2020, 9:20 pm   #5
Gabe001
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Default Re: Bush vhf70

I had a similar problem on a Philco recently and posted the same question. There's usually a small hole at the back. Squirting copious amounts of servisol in the hole and working the switch a few times fixed it for me. Alternatively you could try opening the switch up. There are some good threads on how to get these fixed without having to replace them.

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Old 29th Oct 2020, 10:14 pm   #6
G8UWM-MildMartin
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Default Re: Bush vhf70

I have had that happen when changing mains leads and it was due to some of the original flux flowing down the hollow rivet from the tags into the switch. Sometimes just reheating the joints while operating the switch frees it off.
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Old 30th Oct 2020, 10:25 am   #7
HoraceBatchelor
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Default Re: Bush vhf70

Thanks for the advice everyone, much obliged. I'm beginning to think the excessive heat when de-soldering a stubborn connection, as Martin said, as welded things together inside the switch. Ah well, you live and learn.
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Old 30th Oct 2020, 12:04 pm   #8
60 oldjohn
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Default Re: Bush vhf70

A bit late now but when trying to remove wire from a switch I cut as much of it off as possible including solder with a decent pair of wire cutters. Then apply heat and poke remaining wire out of the hole with a dental pick. This greatly reduces the heat / time taken to a few seconds.

John.
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