02-28-2018, 07:20 PM
My apologies, my plan to work on these amps keeps getting thwarted. I will be back on the bench with these on Friday around 5pm EST.
C16 was replaced but the diode was not. The diode does check out, but I will replace it first thing Friday.
I really appreciate you taking the time to run that test on the V2. When I bring both of these V4's up to clip on my scope, the crossover and bias voltages also look great and it appears as if the amps are running properly. I just wanted to make it clear for everyone that the red plating does not occur until the amp is pushed into an extreme clipping state. This can be created with the volume pot turned to the 2 or 3 o'clock mark with a guitar as the source.
Just a thought I may explore Friday as well: I've have had problems with amps in the past when the manufacturer did not directly fix the control grid resistors to the output tube sockets. When the amp was pushed hard it seemed as if some sort of oscillation was created in the output tubes, causing all kinds of trouble. When I moved the grid resistors directly to the tube sockets the problems went away.
I will check back in Friday after I replace that diode.
Thank you again!
C16 was replaced but the diode was not. The diode does check out, but I will replace it first thing Friday.
I really appreciate you taking the time to run that test on the V2. When I bring both of these V4's up to clip on my scope, the crossover and bias voltages also look great and it appears as if the amps are running properly. I just wanted to make it clear for everyone that the red plating does not occur until the amp is pushed into an extreme clipping state. This can be created with the volume pot turned to the 2 or 3 o'clock mark with a guitar as the source.
Just a thought I may explore Friday as well: I've have had problems with amps in the past when the manufacturer did not directly fix the control grid resistors to the output tube sockets. When the amp was pushed hard it seemed as if some sort of oscillation was created in the output tubes, causing all kinds of trouble. When I moved the grid resistors directly to the tube sockets the problems went away.
I will check back in Friday after I replace that diode.
Thank you again!