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voltage supply for tubes	Reply
by NB9N on June 12, 2008	Mail this to a friend!
I currently have a home brewed sweep tube amplfier using four 6kd6's. It works fairly well and has been in operation for some years. For sake of available parts I powered the heater elements in series with a 24 volt supply rather than a six volt supply. However, I would like to re-create this amp using 811a's. I have never seen any schematic utilizing series fed filiments but only parallel. Is there a good reason for this? It would be a lot easier for me to use an existing lower amperage transformer to do the job. nb9n/ Joel

RE: voltage supply for tubes	Reply
by WB2WIK on June 13, 2008	Mail this to a friend!
811A filament is also the cathode. Placing them in parallel makes separating filament power from RF drive signal easier, just using a bifilar wound RF choke in the filament line. WB2WIK/6

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