Hi,
I modified an apex 460 tube mic about 2 months ago and now it's making alot of noise. I cleaned everything inside, especially the hi impedence parts and although it's a little bit better there is still a constant "white" noise.
The mod is the typical remove cathode follower thing (used a cinemag 2480 transformer and 6072a tube)
When measuring heater voltage it reads 6.45 V dc.
Could this be the problem? Is it killing the tube? Should be 6.3V no? or maybe a little less for the underheating thing....
Any help appreciated.
Freddy
I modified an apex 460 tube mic about 2 months ago and now it's making alot of noise. I cleaned everything inside, especially the hi impedence parts and although it's a little bit better there is still a constant "white" noise.
The mod is the typical remove cathode follower thing (used a cinemag 2480 transformer and 6072a tube)
When measuring heater voltage it reads 6.45 V dc.
Could this be the problem? Is it killing the tube? Should be 6.3V no? or maybe a little less for the underheating thing....
Any help appreciated.
Freddy