Thread: 6sn7 vs 12sn7
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  #4  
Old 09-10-2017, 06:57 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
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A tube with a heater centertap like the 12AU7/AT7/AX7 family, can be configured for either 6 or 12 V.
http://cdn.instructables.com/F6L/JVN...EM0B.LARGE.jpg
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