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In Reply to: RE: I have seen that before a few times where no grid stopper was used. posted by dave slagle on February 25, 2015 at 11:55:46
Grid stopper,the one that goes to the control grid.It basically acts as a high frequency low pass filter to help keep RF out causing parasitic oscillation.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Follow Ups:
The typically 1K series resistor to the grids of PP output tubes was not historically there to prevent oscillation but to prevent blocking distortion from periodic overload. Crowhurst covers this in the link below.
The grid stopper is very often optional.The grid leak is typically not optional.
Edits: 02/25/15
Yes
I see that now..I just noticed it had no grid stopper and it also has no grid leak which is far more important.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
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