Capsule base question

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Greenie

Well-known member
Joined
Jan 31, 2005
Messages
218
Location
Norway
Hi. What could be used instead of metal (steel) in the base of the capsule. I am buildin a U67 and I have to make some adjustments in the capsule base to fit the pcb board. Could it be a turretboard, plastic or other material type?
 
When building tubeamplifiers, the groundloop is a constant problem. Is it ok if the pcb touches the mic rails a problem?
 
Quite the contrary. In whatever mics i've put together, i've strived to have the groundplaneof the pcb make as much contact with the mounting rails as feasible.

In tube amps, on one hand, far greater currents than in mics are involved. And on the other hand, those don't have the option of having a balanced output to connect to other devices downstream (and thus, if necessary, disconnect the XLR output pin 1 from ground / earth).
 
My CAD Trion 8000 has a ground-lift switch for the output XLR pin 1, but i'm not sure i've seen that on other power supplies so far. And i don't recall needing to use it yet.
 
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