Ts4d Motorola

[timmy]

Originally Posted by jr_tech

A few questions:

1. Does the hum actually get louder as you turn the volume control down?

2. Do you observe any change of hum as you change the volume control when the grid of the 25L6 is disconnected?

3. Are you absolutely sure that the cap across the 330 ohm resistor in the cathode circuit of the 25L6 is connected correctly? Properly grounded?

4. Do you have a few more 25L6s to try?

jr

with the grid off the hum is louder but don't change when the volume is raised or lowered. The cap across the 330 is correct and grounded. I tried a new 25l6 or 2 and even a good one but tests weak and again no change. This set is nuts I can't imagine this.