| ampage Tube Amps / Music Electronics |
For current discussions, please visit Music Electronics Forum. |
ampage archive
Vintage threads from the first ten years
What function do these resistors provide?
:
 1/19/2006 1:38 PM |
|
bennypapa |
What function do these resistors provide? I am rebuilding a hacked up Fender bassman and found some resistors in the power supply that I don't understand. Each of the rectifier diodes is paralleled with a 470k resistor. Does anyone know what these resistors do for the circuit. I drew the schematic up http://web.qx.net/bennypapa/electronics/ganntronPSQUESTIONS.jpg Thanks, Ben |
|---|---|
| 1/19/2006 3:16 PM |
|
| DirtyGeorge |
My guess is that they act to distribute the inverse voltage evenly across the diodes. I have not seen this in other PS designs and I don't know if it is necessary but it probably doesn't hurt. DG |
|---|---|
| 1/19/2006 3:57 PM |
|
| Tom Phillips |
Each of the rectifier diodes is paralleled with a 470k resistor. That was an accepted practice in the early days of solid state rectifiers whenever they were stacked in series to get a higher voltage rating. It was done exactly for the reason DG gave. IMHO it is not needed with the rectifier diodes currently available. I never have seen a stock Fender built that way so I would say that someone added them to your amp. Regards, Tom |
|---|---|
| Page 1 of 1 |