D: Difference between revisions

122 bytes removed ,  30 June 2021
Undo revision 61370 by Vintage dave (talk) - turns out my instrument was field-modified
(bad silkscreen)
(Undo revision 61370 by Vintage dave (talk) - turns out my instrument was field-modified)
Tag: Undo
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These two tube types have different heater currents, and because the heaters are
These two tube types have different heater currents, and because the heaters are
series-wired, you cannot switch from one type to the other without circuit modification.
series-wired, you cannot switch from one type to the other without circuit modification.
At least some instruments after S/N 3462 (using 12AU7) were built with old stock of chassis marked "5814" and "53D/54D".


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