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Jim, it would be advisable to replace the 5Z3 with the correct type 80. While they are both full wave rectifiers and pin compatible, the 5Z3 draws considerably more filament current than the 80.
The 80 has a 2 Amp filament while the 5Z3 draws 3 Amps, and places a 50% overload on the filament winding of the power transformer. The transformer is somewhat small as it is and the less you load it the better.
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RE: Philco 610 - by Mondial - 03-09-2022, 09:22 PM
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