Chad
Well-known member
I bought my Blackface module (silverface front panel) pre-modded and was looking it over last night. I found that there were TWO resistors in position R1. I searched the web trying to decode the different color bands to find what value the resistors are. Here is a decent resource for that. See section 6.1:
http://www.teamsaber.com/john/ee/resistor.html
Turns out that one is a 470 ohm (most likely the factory resistor) and the other is a 220 ohm. By using this calculator (another great resource....would also be handy for calculating speaker wiring impedances, etc.):
http://www.1728.com/resistrs.htm
I found that the total resistance with those two resistors in parallel is......150ohms.....the desired value.
Just thought that was kinda interesting and was gonna pass the info along. If a person has trouble finding a 150 ohm resistor, but can find a 220 ohm, then this appears to be a workable alternative.
http://www.teamsaber.com/john/ee/resistor.html
Turns out that one is a 470 ohm (most likely the factory resistor) and the other is a 220 ohm. By using this calculator (another great resource....would also be handy for calculating speaker wiring impedances, etc.):
http://www.1728.com/resistrs.htm
I found that the total resistance with those two resistors in parallel is......150ohms.....the desired value.
Just thought that was kinda interesting and was gonna pass the info along. If a person has trouble finding a 150 ohm resistor, but can find a 220 ohm, then this appears to be a workable alternative.