ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Ben Well, If I am going to use this bia... -- 3/1/2004 3:30 PM View Thread

Re: OK how do I calculate the values for it?

3/2/2004 12:58 PM
Dave H
email
Re: OK how do I calculate the values for it?
If itís like the 6G3 Brown Deluxe schematic on the Fender Field Guide i.e. 100k + diode in series from one end of the B+ winding going to a 22k with a parallel cap to ground the bias voltage will be half the average value of the transformer voltage x the resistor ratio.  
 
333/2/1.11*22/(100+22) = 27V  
 
The 333V on the schematic will be rms. 1.11 is the rms/average ratio for a sine wave.  
 
Dave

 
Replies:
Ben That's exactly what I needed to kno... -- 3/3/2004 1:49 AM