Several DIY solid state amps use light bulbs as incandescent load resistors. For example, the De-Lite Amplifier by Mr. Pass, the SIT amp by Mr. Rothacher, and wrenchone's L'Fake amp. Mr Pass hailed their resultant sound as Organic and different in character than using common load resistors and current source loads. So, why not use the heaters of vacuum tubes in a similar application. Apparently, this idea is not new. Please see the thread in the Pass Labs Form by the DIYer wrenchone which has a title beginning with L'Fake...Its last page shows such applications. I'll reproduce mine in this thread.
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