Re: How much should one invest in tools to get in the hobby/occasional business?
If you are wanting to repair vintage valve radios be aware that the voltages on service sheets were measured with by modern standards a low ohms per volt meter, i.e. an Avo 7. Measuring them with a modern DMM will give erroneous readings which might lead you astray until you have the experience to allow for what will be too high readings. Therefore on my list for you is an Avo 7. This topic has been discussed before on here.
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