Ampex 350/351 VU Meter Lamps?

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The manual doesn't specify as it is part of the meter assembly.  There are both 12.6VDC and 6.3VAC coming from the power supply, but I'd bet the bulbs are run off the AC.  Do you have bulbs that are burnt out, or no bulbs at all?  If you have them, check for any markings.
 
It does not matter whether the meter was made by burlington, simpson or weston; they all take a #47 lamp.
 
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