Surprised to obtain the A****er Kent 137P where some of the tubes have
blue glass, type number 56 and 58, but not every 58 has blue glass.
See http://home.online.no/~la8ak/q2.htm

73
Jan-Martin
LA8AK

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Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/