Not really. A 26 was made to be used on AC and has a heavy filament. (1.5 volts @ 1.05 amps) Being heavy it holds temperature during AC cycles preventing hum.
If you have enough filament voltage you could use a #27 with adapter. For temporary use try #30, direct replacement. They work in RF circuits when you have enough filament voltage.
Other than that you could use any 1.5 volt portable radio tubes, with adapters. Might get away in RF circuits but will have some hum in audio stages.
Norm
:Any good substitution for #26 tube? I do nit mind if I have to make a socket conversion. The #26 tubes are getting too expensive.
:Chuck
:
Try it. I've used #30 tubes with AC on filaments. Works fairly well in RF stages. Does add some hum for audio stages. Not as bad as a person would expect since filament voltage is center tapped.
If you use a pentode tube tie screen and plate together. Try with a 1U4, 1U5, 1T4, 1N5 etc. I did this years ago with AC on filaments. Gain will be higher than with a 26.
Norm
::Chuck
::
:: Not really. A 26 was made to be used on AC and has a heavy filament. (1.5 volts @ 1.05 amps) Being heavy it holds temperature during AC cycles preventing hum.
::
:: If you have enough filament voltage you could use a #27 with adapter. For temporary use try #30, direct replacement. They work in RF circuits when you have enough filament voltage.
::
:: Other than that you could use any 1.5 volt portable radio tubes, with adapters. Might get away in RF circuits but will have some hum in audio stages.
::
::Norm
::
::
::
::
:::Any good substitution for #26 tube? I do nit mind if I have to make a socket conversion. The #26 tubes are getting too expensive.
:::Chuck
:::
::
::
:Norm, could we put a small diode rectifier and filter cap in series with the filament if use one of the 1.5V portable tubes in the audio section of a 26 tube
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