HELLO. I HAVE AN ATWATER KENT MODEL 42. ON THE SIDE OF THE POWER PACK THERE WAS A RESISTOR OF SOME KIND. SOME ONE REMOVED IT AND PUT A 15 AMP FUSE IN ITS PLACE. ANY IDEA WHAT TO PUT IN PLACE OF THAT.HAS ANY ONE KNOW WHAT TO REPLACE THE FUSE WITH? THANK YOU.

Paul W.,

There is a schematic on this site at:

http://www.nostalgiaair.org/Resources/359/M0001359.htm

That may have been a voltage regulating resistance that was used on some models. I am pretty sure if a 15 amp fuse is in the primary of the power transformer of the power supply, that it would be way too large to protect the power supply.

Radiodoc

:HELLO. I HAVE AN ATWATER KENT MODEL 42. ON THE SIDE OF THE POWER PACK THERE WAS A RESISTOR OF SOME KIND. SOME ONE REMOVED IT AND PUT A 15 AMP FUSE IN ITS PLACE. ANY IDEA WHAT TO PUT IN PLACE OF THAT.HAS ANY ONE KNOW WHAT TO REPLACE THE FUSE WITH? THANK YOU.

Here is a modern schematic drawing: http://www.atwaterkent.info/TechData/Drawings/Images/AK09800sch.pdf

Agree with Doc - Probably the ballast resistor should be there? A fuse wouldn't be helpful there, except to just complete the circuit.
Doug

:Paul W.,
:
:There is a schematic on this site at:
:
:http://www.nostalgiaair.org/Resources/359/M0001359.htm
:
:That may have been a voltage regulating resistance that was used on some models. I am pretty sure if a 15 amp fuse is in the primary of the power transformer of the power supply, that it would be way too large to protect the power supply.
:
:Radiodoc
:
:
::HELLO. I HAVE AN ATWATER KENT MODEL 42. ON THE SIDE OF THE POWER PACK THERE WAS A RESISTOR OF SOME KIND. SOME ONE REMOVED IT AND PUT A 15 AMP FUSE IN ITS PLACE. ANY IDEA WHAT TO PUT IN PLACE OF THAT.HAS ANY ONE KNOW WHAT TO REPLACE THE FUSE WITH? THANK YOU.

:HELLO. I HAVE AN ATWATER KENT MODEL 42. ON THE SIDE OF THE POWER PACK THERE WAS A RESISTOR OF SOME KIND. SOME ONE REMOVED IT AND PUT A 15 AMP FUSE IN ITS PLACE. ANY IDEA WHAT TO PUT IN PLACE OF THAT.HAS ANY ONE KNOW WHAT TO REPLACE THE FUSE WITH? THANK YOU. ok its a 28 ohm resietor. but what wattage would it be?1/2 or 10?

Paul: As originally designed, it's more than a simple dropping resistor, it's also a crude voltage regulator. Note that the 28 ohms is specified "cold." When it heats up, and it will, big time, the resistance would go up.

Unless you can find somebody with first-hand knowledge of the hot resistance and the wattage, I would do this:

Bring up the set on a variac with the ballast shorted. Bring up the voltage until the various secondary voltages are close to rated. Measure the input AC voltage and current at that point. That will give you the current and voltage drop you will need through the ballast. Figure resitance from ohm's law. Calculate wattage from I x V, and double for safety.

My guess is that the power resistor will need to be at least 10W or higher.
Doug

:ok its a 28 ohm resietor. but what wattage would it be?1/2 or 10?

well thank you for the advice. but i dont have a variac nor a volt ohm meter. and i never learnd ohms law. so i bit the $49.98 i paid for the atwater kent model 42 from ebay and put it in the trash on the 3rd. and ill probably see it on ebay again someday. i learnd a very good lesson. leave old radios to the experts.

Hi

Need that voltage dropping balast in series with your power transformer. Figure 80-85 volts should be on input to the power transformer.

With this type of power supply be sure the radio section is connected before turning on the switch. Without a load this power supply will have give very high voltages.

Norm

:well thank you for the advice. but i dont have a variac nor a volt ohm meter. and i never learnd ohms law. so i bit the $49.98 i paid for the atwater kent model 42 from ebay and put it in the trash on the 3rd. and ill probably see it on ebay again someday. i learnd a very good lesson. leave old radios to the experts.