Tube testers were in the supermarkets up til the mid 60's. I remember my dad taking all the tubes out of the tv, checking them on the tester at the grocery store and buying replacements for the ones that were gone or about to go.
That was know as Hollow State technology (the remnants of a bygone civilization of which there is no longer anyone alive that understands them).
If you can't make it precise make it adjustable.
N00b Machinist (Jun 28, 2020)
...plenty of Marshall valve amps available new...Oh and my local small appliance repair shop in Nowra, NSW, still has a similar tester in the workshop! I asked them and they told me you'd be surprised how many valve/tube devices are still out there...cheers
Last edited by Beserkleyboy; Jun 20, 2020 at 06:10 PM.
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