Philco 111 schematic question. - Printable Version

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Philco 111 schematic question. - chalupa13 - 09-19-2020

I'm currently restoring Philco Lowboy 111. I am having difficulty comprehending this schematic, particularly rectifier and plate voltages. It seems to me that -VDC is fed from the center tap of the transformer into the field coil and then connects directly to the +VDC line coming from the rectifier tube. Also, it looks like -VDC goes to all tube plates and I'm not sure how that works. I marked the negative in yellow and positive in red. Could someone tell me what am I missing here? Thank you.

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RE: Philco 111 schematic question. - Radioroslyn - 09-19-2020

Hi,
What you are missing is the ground symbol next to 57. Everything to the left of the symbol  is - voltage and everything to the right is +voltage. D and E are - bias voltages for the detector and the audio output stages. Easy peasy! [Image: https://philcoradio.com/phorum/images/smilies/icon_biggrin.gif] You might find this : https://philcoradio.com/library/images/schem/111.jpg diagram easier to work with as it as the pasts values noted.

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