[Central-Electronics] 20A 6AG7 screen grid resistors

[k6jek]

Indeed, a dropping resistor seems appropriate if late addition to the design.

Between the two burnt resistors I can make out enough of the remaining color code to infer 180 ohms so that's what's going back in except I'm putting in two 360's in parallel, carbon composition, because (you guessed it) that's what I have.

Both bypass caps are leaky, i.e, the magic eye does not open on my Heathkit cap checker. I'm replacing the caps with silver micas, 500V

Thanks for the assistance everyone.  I just started this project so I'll probably be pestering you with more questions as I go.

Jon

On Mar 20, 2011, at 4:21 AM, Ron.K3PID wrote:

> FWIW more 6AG7 info:
> 
> My RCA Tube manual shows 300 V as the maximum screen voltage and the typical
> operating value of 150 V.  This would seem to indicate the need for a
> dropping resistor...
> 
> K3PID - Ron