There are no substitutes except other Arcturas tubes, 28, which are also very rare. The tubes have a 15 volt filament.
What tubes are you missing? You could make substitutes by using 12J5, 1626 or similar 12 volt triodes. I have removed the glass from these tubes and added a 4 pin base along with a little resistance in the filament line.
Norm
: I recently acquired this radio and have now found out the tubes would be very rare to find (DE-1, RA-1, SO-1)
: Are there any tube substitutions that could be used in place of these? I have been told the filament voltage is higher on these tubes. Is that correct? Thanks for any information that can be given.
When you rebase or adapt a triode such as the 12J5 to replace a 4 pin tube, what do you do with the cathode connection?
Ed.
: Hi Tracy
: There are no substitutes except other Arcturas tubes, 28, which are also very rare. The tubes have a 15 volt filament.
: What tubes are you missing? You could make substitutes by using 12J5, 1626 or similar 12 volt triodes. I have removed the glass from these tubes and added a 4 pin base along with a little resistance in the filament line.
The cathode is tied to one of the filament pins. The same as in Arcturas tubes. If you want to build some I can check and let you know which filament pin.
Norn
: Hi Norm,
: When you rebase or adapt a triode such as the 12J5 to replace a 4 pin tube, what do you do with the cathode connection?
: Ed.
:
: : Hi Tracy
: : There are no substitutes except other Arcturas tubes, 28, which are also very rare. The tubes have a 15 volt filament.
: : What tubes are you missing? You could make substitutes by using 12J5, 1626 or similar 12 volt triodes. I have removed the glass from these tubes and added a 4 pin base along with a little resistance in the filament line.