Norm, you suggested one alternative for a #26 tube to use one of the 1.5V portable radio tubes. I find the 1U4 would seem to work well as an RF amp in a TRF stage. Plate voltages are about the same. Can I just leave the screen grid open on the 1U4?
Chuck

Chuck

I responded to the other thread first. Try a 1U4 but connect screen to plate. You will have more gain than with a 26.

As a RF amplifier don't think you will add much hum. Tried this in an AK40 years ago.

Make an adapter with 4 pin base and 7 pin min socket.

Norm

:Norm, you suggested one alternative for a #26 tube to use one of the 1.5V portable radio tubes. I find the 1U4 would seem to work well as an RF amp in a TRF stage. Plate voltages are about the same. Can I just leave the screen grid open on the 1U4?
:Chuck
:

:Chuck
:
: I responded to the other thread first. Try a 1U4 but connect screen to plate. You will have more gain than with a 26.
:
: As a RF amplifier don't think you will add much hum. Tried this in an AK40 years ago.
:
: Make an adapter with 4 pin base and 7 pin min socket.
:
:Norm
:
::Norm, you suggested one alternative for a #26 tube to use one of the 1.5V portable radio tubes. I find the 1U4 would seem to work well as an RF amp in a TRF stage. Plate voltages are about the same. Can I just leave the screen grid open on the 1U4?
::Chuck
::
:
:
Thanks Norm
Chuck

:Chuck
:
: I responded to the other thread first. Try a 1U4 but connect screen to plate. You will have more gain than with a 26.
:
: As a RF amplifier don't think you will add much hum. Tried this in an AK40 years ago.
:
: Make an adapter with 4 pin base and 7 pin min socket.
:
:Norm
:
::Norm, you suggested one alternative for a #26 tube to use one of the 1.5V portable radio tubes. I find the 1U4 would seem to work well as an RF amp in a TRF stage. Plate voltages are about the same. Can I just leave the screen grid open on the 1U4?
::Chuck
::
:
:
Norm, I tried a 1T4 in place of the 26 in my Philco Model 87. It worked good, but seems the gain is just a little bit lower than the 26. Is the 1U4 higer gain than the 1T4?
Cuuck
Chuck