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09-26-2021, 11:14 PM
Hi Kai
See your thread about preamp tube switching for the part numbers for the switches.
Yes, you can disable both heaters and plate + screen supplies for the tubes in question. If we assume the two sets of tubes share an OT, then it might take three DPDTs to select the tube pair. Ine DPDT can select the plates, with the switch wipers tied to the ends of the OT. The second DPDT can select the screens to be powered with the switch wipers connected to any T-U-P switching in place. The third DPDT can select which heater pair is powered. The switches noted have a 3A rating, so one pole per exclusive tube pair.
The use of multiple switches can be ergonomically problematic inasmuch as it is easy to not switch all the switches. Adding relays to perform the actual mode switching allows a single SPDT to select the tube set. You could mechanically link the three toggles or just be diligent about switching the three together - place them in close proximity so one hand motion gets all three easily.
Have fun
See your thread about preamp tube switching for the part numbers for the switches.
Yes, you can disable both heaters and plate + screen supplies for the tubes in question. If we assume the two sets of tubes share an OT, then it might take three DPDTs to select the tube pair. Ine DPDT can select the plates, with the switch wipers tied to the ends of the OT. The second DPDT can select the screens to be powered with the switch wipers connected to any T-U-P switching in place. The third DPDT can select which heater pair is powered. The switches noted have a 3A rating, so one pole per exclusive tube pair.
The use of multiple switches can be ergonomically problematic inasmuch as it is easy to not switch all the switches. Adding relays to perform the actual mode switching allows a single SPDT to select the tube set. You could mechanically link the three toggles or just be diligent about switching the three together - place them in close proximity so one hand motion gets all three easily.
Have fun
