Re: Ferrograph part missing?
The 5A documentation I have seen shows a ECC 82, I have not seen any documentation for the 5B.
The ECC 83 is a pin compatible high gain version of the ECC 82 but not sure of its compatibility in the Bias Oscillator circuit.
If record erases an existing recording then that goes some way to indicating that the Bias Oscillator maybe functional.
David
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