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Telrad - common failures?

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I seem to have two Telrads which have stopped working. Put new batteries in and nothing. Are there any common failures which happen, they seem pretty simple so am struggling to see what could go wrong!

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Problem no 1 solved, that was a dodgy connection to the battery holder. Just need to re solder the wires and it should be sorted.

No 2 I suspect is the potentiometer but it needs further investigation.

Thanks all 👍

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29 minutes ago, Ian McCallum said:

Farnell, CPC, Mouser, RS Parts, etc?

Yes, I meant the "official" part, on UK Astro sites. I'm sure there's a similar version here somewhere, but I wouldn't know enough about the specs.

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