Quote:
Originally Posted by Radio Tech
when I looked at the details of the output valve the voltages on the grid, screen and anode are very different to those measured
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The voltages shown for the valve characteristics will be MAXIMUM values....not much use when comparing them in a simple amplifier like this one. What is the cathode voltage? From that, it's easy to work out how much current the valve is drawing by using Ohms law. It will probably be somewhere between 9V - 12V in a circuit like this.
As others suggested, touch the control grid (pin 2....hold one end of a .01uF capacitor or similar and touch the other end to the grid....you should get a loud hum). If you do the amplifier is OK and you need to check the cartridge and wiring.