Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: J Rindt on June 29, 2012, 09:57:17 pm

Title: Trem tube ground
Post by: J Rindt on June 29, 2012, 09:57:17 pm

http://www.el34world.com/charts/Schematics/files/ampeg/m12_6v6.pdf (http://www.el34world.com/charts/Schematics/files/ampeg/m12_6v6.pdf)

In the above sshem.
Tremolo tube.
In your guys opinion.....Is there a problem, electronic or audio, with grounding the 120k and 270k resistors in the trem circuit with the cat resistor of the foot switch.?
Can I just ground all 3 of those at the same node without any worry of creating an issue.?
I am not really sure what all different currents (besides the cat) are involved there, and if they conflict.
Thank You

Title: Re: Trem tube ground
Post by: sluckey on June 30, 2012, 06:55:14 am

The 270K resistors are plate resistors and should connect to B+, not ground. But everything at the bottom of that circuit that is connected to ground can share the same ground point, ie, 120K, speed pot, unmarked grid resistor, cathode bypass cap, footswitch, and intensity pot.

Title: Re: Trem tube ground
Post by: J Rindt on June 30, 2012, 08:49:28 am

Quote from: sluckey on June 30, 2012, 06:55:14 am

The 270K resistors are plate resistors and should connect to B+, not ground. But everything at the bottom of that circuit that is connected to ground can share the same ground point, ie, 120K, speed pot, unmarked grid resistor, cathode bypass cap, footswitch, and intensity pot.

I guess it is called a grid leak resistor.....from the grid(s) to ground. It is 270k.
Anyway all that stuff can share a common.?
Thanks, just wanted to make sure.