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Neither the 511 nor the 511A has a [[thermal cutoff]]. | Neither the 511 nor the 511A has a [[thermal cutoff]]. | ||
The 511 and 511A were normally furnished with P1 phosphor. | The 511 and 511A were normally furnished with P1 [[phosphor]]. | ||
P7 and P11 were optional, at no extra charge. | P7 and P11 were optional, at no extra charge. | ||