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Old 17th Mar 2018, 3:15 pm   #54
Nuvistor
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Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,427
Default Re: Bush VHF 81 Restoration

Output valves get hot, you can easily measure the current through the valve.
Confirm the value of the cathode bias resistor and that the bypass capacitor is not faulty.
Measure the voltage across the cathode resistor and use ohms law to work out the current through the valve.
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