The Pleiades Electra 2 electron tube headphone amplifier for example can operate with 7.4 volts if no cathode resistor is used (see a previous euroelectron post on reducing components on Pleiades Electra 2).
An excellent battery holder with drawer function taking 4 AA size batteries is Bulgin BX0027.
It has four terminals giving 2 outputs of 2 pairs of AA batteries.
If 3.7V Li-ion batteries are used each channel of the Pleiades Electra 2 can be powered by a pair.
The two thin and long (for 2 AA batteries in series) bulgin battery holder BX0012/1 may be suitable too for saving space, or four BX0011/1 each containing one AA.
Fuses should be used.
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