Two things:
1)If you happen to short out the battery you may get some very original
fireworks.
2)There are low voltage tubes designed for batteries - better to use them.
There have been a number of tube designs using batteries, see for example this
linestage http://www.audioasylum.com/forums/ne...sages/115.html
That one uses ECC86, a double triode with ECC88 pinout which was designed for
battery operation. Has a mu of 14
http://www.mif.pg.gda.pl/homepages/f...035/6/6GM8.pdf

=== Andy Evans ===
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