I have a couple questions.First:Can you rewire a battery set so the filaments are in series?Let's say there are 5 or 6 2 volt DC tubes ,so if you connected them in series coud you run them off a 12 volt battery ? Second question : Let us say you have this wonderful huge radio that is battery operated but would sound much better by putting a 6L6 or 6V6 power output configuration and a more powerful speaker of course and adding the power supply and everything.The question is can the battery dc filament tubes such as a 1C6(pentagrid converter) be changed to a 6 volt pentagrid converter such as a 6A8 etc etc.. as long as the rewiring is done to match the proper pins and bias adjusted etc.....In other words can the RF and IF COILS and other components of battery sets work with maybe higher plate etc... voltage and current of 6 volt tubes without burning out?

You can wire filaments in series - but they all need to have the same current rating.

You will have all kinds of issues with cathodes, or the lack of them, and biases. Anything can be done given enough time and money.

:You can wire filaments in series - but they all need to have the same current rating.
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As Mr. codefox hints, the filaments are the easy part.
Even that will have its wrinkles. 6V6GT and 6A8G have different current ratings. You would need resistors to drop the unused filament voltage, too.

The output impedance of the tubes are different, so the IFs will be different, too.

Best Regards,

Bill Girmm

:I have a couple questions.First:Can you rewire a battery set so the filaments are in series?Let's say there are 5 or 6 2 volt DC tubes ,so if you connected them in series coud you run them off a 12 volt battery ? Second question : Let us say you have this wonderful huge radio that is battery operated but would sound much better by putting a 6L6 or 6V6 power output configuration and a more powerful speaker of course and adding the power supply and everything.The question is can the battery dc filament tubes such as a 1C6(pentagrid converter) be changed to a 6 volt pentagrid converter such as a 6A8 etc etc.. as long as the rewiring is done to match the proper pins and bias adjusted etc.....In other words can the RF and IF COILS and other components of battery sets work with maybe higher plate etc... voltage and current of 6 volt tubes without burning out?
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Ed M

::I have a couple questions.First:Can you rewire a battery set so the filaments are in series?Let's say there are 5 or 6 2 volt DC tubes ,so if you connected them in series coud you run them off a 12 volt battery ? Second question : Let us say you have this wonderful huge radio that is battery operated but would sound much better by putting a 6L6 or 6V6 power output configuration and a more powerful speaker of course and adding the power supply and everything.The question is can the battery dc filament tubes such as a 1C6(pentagrid converter) be changed to a 6 volt pentagrid converter such as a 6A8 etc etc.. as long as the rewiring is done to match the proper pins and bias adjusted etc.....In other words can the RF and IF COILS and other components of battery sets work with maybe higher plate etc... voltage and current of 6 volt tubes without burning out?
::
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:I have rewired several battery radios to use 6.3 volt tubes. You essentially have to re-wire the radio. But the insulation on the old wiring was already crumbling, and falling off the wire anyway. Typically I make a power supply that fits remote or in the battery compartment; never tried tubes in series - just a 6.3 volt winding, and solid state supply to give well-filtered 150 volts. Tube pinouts typically are not the same. Bias resistors must be changed. One of the windings on the oscillator coil needs to be reversed, as the converter circuits are different. Use the right output transformer for the tubes used, although 6V6 are pretty forgiving if you only want a watt or so, and are not expecting hi-fi. It's a lot of work, but it can make a beautiful radio play. Before you do this, make sure the radio is not rare or valuable, in which case you will want to keep it as original as possible. You can also build a power supply to use in place of the batteries, and use the originally specified tubes. Whatever you do, beware of creating a chassis that is "hot" - line voltage on exposed metal.
:Ed M
:Thanks for info gentlemen!I think I will just build a proper supply!
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