Quote:
Originally Posted by Electronic M
If you use a bulb then inserting it between the top cap and the lead that connects there is a better idea as a series cathode resistance from the bulb could throw off the grid bias.
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This is true. But the 4V or so dropped by the bulb would be negligible and probably not noticeable except for a slight width reduction. For convenience doing 'dip checks' in the field, we put the bulb in the plate lead, using a little made-for-purpose adapter.