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The 5Y3GT is traditionally a directly heated full wave rectifier, with inverted v's of coated tape as filaments. However, this implementation looks the same as the GZ30 in terms of the same getter holder, glass foot construction and is clearly indirectly heated. This looks to be from the 1950s or later.
The maximum reservoir capacitance for the 5Y3GT is 32 µF and minimum series resistance is 100Ω, The GZ30: 50 µF, series resistance 380Ω