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RE: 813 set schematic

Your schematic seems to show direct coupling which requires a higher starting B+, so that must be a mistake. That said, you may want to check the maximum grid resistance for 813, because it's way lower than most, which is why Altec used a CT choke to feed the bias to the grids of their PP 813 amp. Therefore if you used a resistor your coupling cap would have to be quite large. Same with a grid choke. An IT may be useful here.


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  • RE: 813 set schematic - buffy 14:52:34 02/11/19 (1)

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