At your risk. There should be a fuse in series with a battery for fire protection. Batteries as any electric potential source can be lethal too.
For so many years there might have been some kind of battery phobia.
Endless ink for cathode resistor, capacitor in parallel, sometimes complicated biasing procedures.
With just 3 batteries for Va, Vb, Vc, as seen on one of the first amplifier patents by Arnold and 2 transformers an amplifier can be made which sounds so amazing, words can not describe.
In more modern times the Pleiades DL94 sounds very nice, see previous euroelectron posts.
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