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Old 18th Jun 2019, 4:43 pm   #75
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 12,216
Default Re: Mullard 5-10 amplifier

The scope picture back in post 67 is interesting. The noise looks a bit spikey, fairly infrequent extra-large narrow spikes sticking out from more normal noise. Suspicious!

Any bad connections, dry joints or carbon composition resistors?

These would fit with the screwdriver tapping sensitivity.
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