[ms660]

Ok, the zero volts at the grid is good, 0.75 volts on the cathode is not so good, there are no voltages shown on the Dansette Bermuda schematic I'm looking at but the cathode voltage should certainly be much higher than 0.75 volts.

You need to concentrate as to why that voltage is low.....Possibilities:

1) Low anode voltage.

2) The resistance between the cathode and chassis is abnormally low, that could be the cathode bias resistor gone low value value or the cathode bypass capacitor being electrically leaky, or a combination of both, disconnecting that capacitor and measuring the cathode voltage would prove the capacitor as yes or no for leaking. According to the schematic I'm looking at the cathode bias resistor should measure 120 ohms or there about.

3) Low emission valve.

If the anode voltage is reasonable (180 volts or higher) then I would concentrate on the cathode components.

Lawrence.