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Two filaments on a battery: bad luck?

Posted by randallvw (A) on January 28, 2007 at 19:00:18

I have a couple 30's that I'd like to play with as the VA stage in a preamplifier. Is it a bad idea to use a single battery for both filaments, or should I really be using two?

Also, as I place cells in series, what effect does this have on the amp-hour rating of the battery? Do two 1000mAh cells make a 2000mAh battery, or simply a 1000mAh battery with a higher voltage?

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