Quote:
Originally Posted by Electronic M
The filaments are series string so you can't really reduce heater power by using only solid state replacements... you'll either reduce power to the remaining filament or not achieve power consumption reduction.
In pretty much all tube portables the B battery asts the shelf life of the battery and the A (filament) battery is what gets spent quickly.
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My understanding though is that the later tube battery sets had much better "A" battery life span than the earlier ones did like my Coronado 630B for example that used the old 2.1 Volt tubes vs. the later 7 pin miniature tubes that ran at 1.5 volts, like this Trans-Oceanic uses and has much less current draw.