RCA Schematic

2/16/2005 11:01:21 AMJohn D. Weeks

Hi
I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks

2/16/2005 11:19:13 AMPoston Drake

Hi John,
An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
Poston

:Hi
:I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks

2/16/2005 12:57:14 PMJohn D. Weeks

:Hi John,
:An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
:Poston
:
:Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
::Hi
::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks

2/16/2005 1:56:59 PMPoston Drake

John,
There are quite a few of the RC-1000 series chassis listed in SAMS Photofact index, and I should have most of them in my files. How about posting your tube lineup, and I will spot-check them and see if one matches yours.
Poston

::Hi John,
::An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
::Poston
::
::Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
:::Hi
:::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks

2/16/2005 2:33:29 PMJohn D. Weeks

:John,
:There are quite a few of the RC-1000 series chassis listed in SAMS Photofact index, and I should have most of them in my files. How about posting your tube lineup, and I will spot-check them and see if one matches yours.
:Poston
:
:
:::Hi John,
:::An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
:::Poston
:::
:::Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
::::Hi
::::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks
:
:The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks

2/16/2005 3:24:32 PMRadiodoc

::John,
::There are quite a few of the RC-1000 series chassis listed in SAMS Photofact index, and I should have most of them in my files. How about posting your tube lineup, and I will spot-check them and see if one matches yours.
::Poston
::
::
::::Hi John,
::::An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
::::Poston
::::
::::Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
:::::Hi
:::::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks
::
::The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks

Gentlemen,

My Beitman Supreme Publications index shows a diagram in the 1941 manual on page 121 for an RCA RC1001B (12X and 12X2). I believe it was mentioned that the 1200 ohm resistor trys to burn up. The schematic shows a 1200 ohm resistor (R9) in the power supply filter circuit between the input filter cap (30MFD) and output filter cap (50MFD). Have you replaced the power supply filter caps?

Radiodoc

2/16/2005 5:16:54 PMRadiodoc

:::John,
:::There are quite a few of the RC-1000 series chassis listed in SAMS Photofact index, and I should have most of them in my files. How about posting your tube lineup, and I will spot-check them and see if one matches yours.
:::Poston
:::
:::
:::::Hi John,
:::::An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
:::::Poston
:::::
:::::Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
::::::Hi
::::::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks
:::
:::The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks
:
:Gentlemen,
:
:My Beitman Supreme Publications index shows a diagram in the 1941 manual on page 121 for an RCA RC1001B (12X and 12X2). I believe it was mentioned that the 1200 ohm resistor trys to burn up. The schematic shows a 1200 ohm resistor (R9) in the power supply filter circuit between the input filter cap (30MFD) and output filter cap (50MFD). Have you replaced the power supply filter caps?
:
:Radiodoc
:
John,

Did a little research on this site using RCA 12X. Try looking at http://www.nostalgiaair.org/PagesByModel/745/M0014745.pdf.

Radiodoc

2/16/2005 5:50:07 PMJohn D. weeks

::::John,
::::There are quite a few of the RC-1000 series chassis listed in SAMS Photofact index, and I should have most of them in my files. How about posting your tube lineup, and I will spot-check them and see if one matches yours.
::::Poston
::::
::::
::::::Hi John,
::::::An RCA number with an "RC-" prefix would be the chassis number, not the model number. But a chassis number should be sufficient to find a listing in either Rider or SAMS Photofacts. However, I cannot find the "RC-1001" listed anywhere. You might want to double-check that number?
::::::Poston
::::::
::::::Yeah, it is the chassis number. And, I've checked it 100 times. the one that is simular is RC 1050, but the tube configuration is not right. The problem I am having is a 1200 ohm resistor is heating up across the power output tube. I have checked the audio transformer, and it ohms out to 250 like the RC 1050 calls for. I get a hum out of the speaker, but then, the resistor heats up (smoking). Any ideas?
:::::::Hi
:::::::I need a schematic for a RCA tabletop radio. The model number on the chassis is RC1001B. This model number is not in the model nnumber. Thanks
::::
::::The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks
::
::Gentlemen,
::
::My Beitman Supreme Publications index shows a diagram in the 1941 manual on page 121 for an RCA RC1001B (12X and 12X2). I believe it was mentioned that the 1200 ohm resistor trys to burn up. The schematic shows a 1200 ohm resistor (R9) in the power supply filter circuit between the input filter cap (30MFD) and output filter cap (50MFD). Have you replaced the power supply filter caps?
::
::Radiodoc
::
:John,
:
:Did a little research on this site using RCA 12X. Try looking at http://www.nostalgiaair.org/PagesByModel/745/M0014745.pdf.
:
:Radiodoc
::Thanks! That is the Schematic. I will take a look and see what is causing the heat up.

2/16/2005 9:16:40 PMPoston Drake

JOHN,
I found your chassis RC-1001B in the RCA Redbook. This chassis was used in models 10X (2nd Production), 12X and 12X2. You should be able to find a Rider schematic, referenced by these model numbers, here on NostalgiaAir.

The resistor in question is the filter resistor (1200 ohms). Use a 1 watt resistor for replacement. Also replace the electrolytic filter capacitors (30 mfd input, 50 mfd output) if you have not done so already. A leaky or shorted output filter capacitor can cause the filter resistor to burn up. If you continue to have trouble after replacing the filter capacitors, then the B+ plate circuit is drawing too much current (most likely due to leaky paper caps or a short somewhere in this circuit.)
Poston

::
::The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks

2/22/2005 4:24:14 PMJohn Weeks

:JOHN,
:I found your chassis RC-1001B in the RCA Redbook. This chassis was used in models 10X (2nd Production), 12X and 12X2. You should be able to find a Rider schematic, referenced by these model numbers, here on NostalgiaAir.
:
:The resistor in question is the filter resistor (1200 ohms). Use a 1 watt resistor for replacement. Also replace the electrolytic filter capacitors (30 mfd input, 50 mfd output) if you have not done so already. A leaky or shorted output filter capacitor can cause the filter resistor to burn up. If you continue to have trouble after replacing the filter capacitors, then the B+ plate circuit is drawing too much current (most likely due to leaky paper caps or a short somewhere in this circuit.)
:Poston
:
:
:
:
:::
:::The tubes are as follows: 12SA7 1st det.&Osc.,12SK7 IF, 12SQ7 2nd Det.,AF,and AVC, 50L6GT Output, 35Z5 Rectifier. Thanks

:
:Your Info was great. I found the schematic and the caps that were in the radio was not the correct size. Someone had put 2 16mf in for the 50 and 30. I put the correct value in and no more problems. Thanks for your help.