Thread: What Happened to 15AP22 Through 15FP22?
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Old 04-20-2014, 10:26 AM
Steve McVoy's Avatar
Steve McVoy Steve McVoy is offline
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Number were assigned to tubes ignoring the phosphor. 15AP4, 15CP4, 15DP4 and 15EP4 were manufactured. 15BP4 and FP4 were probably registered by someone but never made.
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