01-13-2018, 10:58 PM
Well,
When I put everything in the cabinet, the hum became really pronounced.
This is the hum that is independent of the volume.
I put it back on the bench, and traced the hum to the 1st AF driver, a 26 tube.
Pulled out, the hum stops.
Shorted to GND with a wire or a cap grid when in also stops the hum.
The suspect: the Interstage transformer between the detector and the AF. The output windng ohms out at 6,000 Ohms.
Questions: 1. Has anyone else experienced the hum problem, 2. Is the 6,000 ohm the right resistance for the interstage xfmr secondary? The one mentioned before.
When I put everything in the cabinet, the hum became really pronounced.
This is the hum that is independent of the volume.
I put it back on the bench, and traced the hum to the 1st AF driver, a 26 tube.
Pulled out, the hum stops.
Shorted to GND with a wire or a cap grid when in also stops the hum.
The suspect: the Interstage transformer between the detector and the AF. The output windng ohms out at 6,000 Ohms.
Questions: 1. Has anyone else experienced the hum problem, 2. Is the 6,000 ohm the right resistance for the interstage xfmr secondary? The one mentioned before.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
