pucho812
Well-known member
This is a good one as we have the service manual in the tech docs.
I measure 129vdc at test point 5 on the mic which is B+ feeding the capsule. I should see 120Vdc. On the adjustable pattern I get from 0vdc to 108vdc
Other test points are a few Volta high as well except the heaters which are 12.6
The mic works, but in cardioid pattern starts at a nice signal level and after a couple seconds drops in volume. If I switch patterns The mic works and sounds pretty good, Omni and fig-8 behave as expected.
Obviously I need to fix the B+ to be 120vdc as per the design. the capsule looks clean and I have a known good tube.
Could my higher then expected B+ cause my cut out in cardioid or do I have a capsule issue?
I measure 129vdc at test point 5 on the mic which is B+ feeding the capsule. I should see 120Vdc. On the adjustable pattern I get from 0vdc to 108vdc
Other test points are a few Volta high as well except the heaters which are 12.6
The mic works, but in cardioid pattern starts at a nice signal level and after a couple seconds drops in volume. If I switch patterns The mic works and sounds pretty good, Omni and fig-8 behave as expected.
Obviously I need to fix the B+ to be 120vdc as per the design. the capsule looks clean and I have a known good tube.
Could my higher then expected B+ cause my cut out in cardioid or do I have a capsule issue?