Please help with Holland 5AR4 codes

Tubes Asylum

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I have a pair of Holland-made 5AR4 tubes, dual "D" getters and getter flashing which is a sort of bronze hue. They are brown base and branded "Marconi".
Factory code for both is:
f33
Date codes are:
X9L and L0B
Does anyone know the factory city location and dates of these tubes?
Thanks in advance to all will share their knowledge of these codes.
John

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Topic - Please help with Holland 5AR4 codes - jb0194 23:19:32 04/11/07 (3)

Re: Please help with Holland 5AR4 codes - tango4@telia.com 02:57:59 04/12/07 (2)

Re: Please help with Holland 5AR4 codes - jb0194 07:07:02 04/12/07 (1)

Re: Please help with Holland 5AR4 codes - JG2 20:47:04 04/12/07 (0)

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