When I was installing a new tube in my preamp, the plastic guide key broke off. Is it absolutely necessary that the tube be orientated the way the key shows?
The filament pins of 6sn7 are 7 and 8, you can use a DMM ( digital multimeter ) to identify the filament pins by using ohm meter, other pins will show open circuit except pin 7 and pin 8 have resistance reading.
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