Trying to work out a little glich in my Silvertone model 101.506 I've gotten it operating thanks to schmatics from Norm Leal, but I can't seem to get the volumn turned all the way down. When the knob is turned to its lowest setting I still have significant audio level. The pot seems to work fine and ohmmeter registers high resistance when volume is set at lowest point. Noticed a part called a "bias cell" is attached to the pot. Haven't seen one of these in schematics before. What is it really and are they prone to failure?
Any suggestions?

I'm also looking for alignment instuctions if anyone has them available. All of the padders, etc. are tightly fit under the chassis and it has been difficult to trace what each does with out a rider's.

Thanks in advance to all who might have some input.

Justin

I've sent you the alignment information from Rider. You may already have this info.

The bias cell is a small battery and may be replaced by a watch battery. It will be bad. It's best to replace it as the cell dries out and will add resistance to the circuit.

The purpose of the battery is to give a slight negative bias to the 6B6. This helps the tube operate in a more linear area.

Not many radios used the bias cell. You can replace this bias cell in your radio with a .01 mfd cap. In addition connect a 4.7 meg - 10 meg resistor from the grid of the 6B6 to ground.

The bias cell could keep the sound from going all the way down. Does your volume control go all the way to ground? If there is 1000 ohms to ground you will still hear the radio.

Norm

: Hi all,

: Trying to work out a little glich in my Silvertone model 101.506 I've gotten it operating thanks to schmatics from Norm Leal, but I can't seem to get the volumn turned all the way down. When the knob is turned to its lowest setting I still have significant audio level. The pot seems to work fine and ohmmeter registers high resistance when volume is set at lowest point. Noticed a part called a "bias cell" is attached to the pot. Haven't seen one of these in schematics before. What is it really and are they prone to failure?
: Any suggestions?

: I'm also looking for alignment instuctions if anyone has them available. All of the padders, etc. are tightly fit under the chassis and it has been difficult to trace what each does with out a rider's.

: Thanks in advance to all who might have some input.

: Justin