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Discuss old and vintage Geiger counters and equipment. Please try to keep this to pre-1990's counters and other radiation related equipment from that era.
Just another alternative, but I've had wonderful luck replacing obsolete higher voltage batteries for a variety of devices with [as many rechargeable lithium batteries as I can fit in the space] + a tiny voltage booster board. Inexpensive, adjustable buck-boost and DC-DC boost boards can go up to 90v or higher.
