Are there capacitors inside the shielding cans on the chassis? If so are they accessible, do they need replacement or are they mica types? One that particularly worries me is a "Quality Condenser" indicated on the schematic as being across the primary winding of the audio frequency output transformer.
Another question, if I may: the pilot lamp is burned out. My schematic gives no information on it. It has a white bead. Is it a type 48 ?, .06 amp or .112 amp?
Would very much appreciate comments from anyone who has worked on this chassis.
Thanks
Lode Swinnen
lswinnen@aol.com
The pilot lamp should be a #41 bulb. It's rated at 2.5 volts @ .5 amps. The bulb is operated off your 2.5 volt filament line with a small series resistor to reduce surges giving it longer life.
The Atwater Kent 55C does have oil type caps inside metal cans, not mica. Although not usually bad in an AK55C it would be still best to replace these caps. The AK55 and AK55C are early radios that often operate when turned on without changing parts.
The "quality cap" is for tone compensation and to prevent the audio section from going into high frequency oscillation. Atwater Kent didn't show values on their early schematics but using a .01 mfd @ 600 volts would be ok. Smaller caps will give better high frequency response. No cap or too small a value may allow oscillation.
Norm
: I am restoring an Atwater Kent 55C console (late type). It is in very good condition, but before plugging it in, i will put in new filter and bypass capacitors. There seem to be more capacitors on the schematic than I can find underneath the chassis.
: Are there capacitors inside the shielding cans on the chassis? If so are they accessible, do they need replacement or are they mica types? One that particularly worries me is a "Quality Condenser" indicated on the schematic as being across the primary winding of the audio frequency output transformer.
: Another question, if I may: the pilot lamp is burned out. My schematic gives no information on it. It has a white bead. Is it a type 48 ?, .06 amp or .112 amp?
: Would very much appreciate comments from anyone who has worked on this chassis.
: Thanks
: Lode Swinnen
: lswinnen@aol.com
: The pilot lamp should be a #41 bulb. It's rated at 2.5 volts @ .5 amps. The bulb is operated off your 2.5 volt filament line with a small series resistor to reduce surges giving it longer life.
: The Atwater Kent 55C does have oil type caps inside metal cans, not mica. Although not usually bad in an AK55C it would be still best to replace these caps. The AK55 and AK55C are early radios that often operate when turned on without changing parts.
: The "quality cap" is for tone compensation and to prevent the audio section from going into high frequency oscillation. Atwater Kent didn't show values on their early schematics but using a .01 mfd @ 600 volts would be ok. Smaller caps will give better high frequency response. No cap or too small a value may allow oscillation.
: Norm
:
: : I am restoring an Atwater Kent 55C console (late type). It is in very good condition, but before plugging it in, i will put in new filter and bypass capacitors. There seem to be more capacitors on the schematic than I can find underneath the chassis.
:
: : Are there capacitors inside the shielding cans on the chassis? If so are they accessible, do they need replacement or are they mica types? One that particularly worries me is a "Quality Condenser" indicated on the schematic as being across the primary winding of the audio frequency output transformer.
:
: : Another question, if I may: the pilot lamp is burned out. My schematic gives no information on it. It has a white bead. Is it a type 48 ?, .06 amp or .112 amp?
:
: : Would very much appreciate comments from anyone who has worked on this chassis.
:
: : Thanks
:
: : Lode Swinnen
: : lswinnen@aol.com
Thank you for your, as always, very helpful response. One thing that I remain a bit unclear about is the physical location of some of the capacitors in the AK 55C. There are large square brown cans on the upper surface of the chassis. One clearly contains the filter condensers. The others contain transformers and at least one that I managed to open is filled with tar. The question is whether there are capacitors tucked away in any of the cans other than the filter condenser can. I am reluctant to disturb these cans without good reason, but can't find all the capacitors shown on the schematic underneath the chassis.
Thank you very much
Lode Swinnen
: Hi Lode
: The pilot lamp should be a #41 bulb. It's rated at 2.5 volts @ .5 amps. The bulb is operated off your 2.5 volt filament line with a small series resistor to reduce surges giving it longer life.
: The Atwater Kent 55C does have oil type caps inside metal cans, not mica. Although not usually bad in an AK55C it would be still best to replace these caps. The AK55 and AK55C are early radios that often operate when turned on without changing parts.
: The "quality cap" is for tone compensation and to prevent the audio section from going into high frequency oscillation. Atwater Kent didn't show values on their early schematics but using a .01 mfd @ 600 volts would be ok. Smaller caps will give better high frequency response. No cap or too small a value may allow oscillation.
: Norm
:
: : I am restoring an Atwater Kent 55C console (late type). It is in very good condition, but before plugging it in, i will put in new filter and bypass capacitors. There seem to be more capacitors on the schematic than I can find underneath the chassis.
:
: : Are there capacitors inside the shielding cans on the chassis? If so are they accessible, do they need replacement or are they mica types? One that particularly worries me is a "Quality Condenser" indicated on the schematic as being across the primary winding of the audio frequency output transformer.
:
: : Another question, if I may: the pilot lamp is burned out. My schematic gives no information on it. It has a white bead. Is it a type 48 ?, .06 amp or .112 amp?
:
: : Would very much appreciate comments from anyone who has worked on this chassis.
:
: : Thanks
:
: : Lode Swinnen
: : lswinnen@aol.com
I see the problem.. Some Rider information for the AK55 isn't in the index so it's not shown here under schematics.. I've emailed you the chassis layout for AK 55C which shows capacitor locations. Let us know if this helps.
Norm
: Norm,
: Thank you for your, as always, very helpful response. One thing that I remain a bit unclear about is the physical location of some of the capacitors in the AK 55C. There are large square brown cans on the upper surface of the chassis. One clearly contains the filter condensers. The others contain transformers and at least one that I managed to open is filled with tar. The question is whether there are capacitors tucked away in any of the cans other than the filter condenser can. I am reluctant to disturb these cans without good reason, but can't find all the capacitors shown on the schematic underneath the chassis.
: Thank you very much
: Lode Swinnen
:
: : Hi Lode
: : The pilot lamp should be a #41 bulb. It's rated at 2.5 volts @ .5 amps. The bulb is operated off your 2.5 volt filament line with a small series resistor to reduce surges giving it longer life.
: : The Atwater Kent 55C does have oil type caps inside metal cans, not mica. Although not usually bad in an AK55C it would be still best to replace these caps. The AK55 and AK55C are early radios that often operate when turned on without changing parts.
: : The "quality cap" is for tone compensation and to prevent the audio section from going into high frequency oscillation. Atwater Kent didn't show values on their early schematics but using a .01 mfd @ 600 volts would be ok. Smaller caps will give better high frequency response. No cap or too small a value may allow oscillation.
: : Norm
: :
: : : I am restoring an Atwater Kent 55C console (late type). It is in very good condition, but before plugging it in, i will put in new filter and bypass capacitors. There seem to be more capacitors on the schematic than I can find underneath the chassis.
: :
: : : Are there capacitors inside the shielding cans on the chassis? If so are they accessible, do they need replacement or are they mica types? One that particularly worries me is a "Quality Condenser" indicated on the schematic as being across the primary winding of the audio frequency output transformer.
: :
: : : Another question, if I may: the pilot lamp is burned out. My schematic gives no information on it. It has a white bead. Is it a type 48 ?, .06 amp or .112 amp?
: :
: : : Would very much appreciate comments from anyone who has worked on this chassis.
: :
: : : Thanks
: :
: : : Lode Swinnen
: : : lswinnen@aol.com