RCA Model 6K

12/9/2006 7:42:25 PMBruce Walters

I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.

12/9/2006 7:52:00 PMRadiodoc

Bruce,

You can find the service data on this site under Resources at:

http://www.nostalgiaair.org/Resources/099/M0015099.htm

I believe the socket voltage page shows the rectifier plate voltage at 315-0-315.

Radiodoc

:I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.
:

12/9/2006 11:55:19 PMBruce Walters

Thanks Mr. Radio Doc :>) I should have seen that, but I am still not a seasoned veteran and pointing out what should have been obvious is still something I need. I am almost embarassed, but not quite. I find a horizontal mount xformer in the AES catalog that provides 325-0-325, @ 40ma, 5v @ 2A and 6.3v @ 2A. I have lots of experiences in digital electronics, but I am definately limited on radios. I think 325 is fine for the 315 replacement, but the 40ma for the high voltage and the 2amps for the filiment are just guesses to me. I have no idea if this is enough output to replace the original part. A simple yes or no is a good answer, but I am really trying to learn to figure these things out, so if there is a magic formula or something else I overlooked, I would appreciate nothing that. Thanks for all the help, it is appreciated. By the way, I just added a Majestic Grandfather clock/radio to my collection today, works perfeclty and what a catch. Beautiful piece for the hallway :>)

:Bruce,
:
:You can find the service data on this site under Resources at:
:
:http://www.nostalgiaair.org/Resources/099/M0015099.htm
:
:I believe the socket voltage page shows the rectifier plate voltage at 315-0-315.
:
:Radiodoc
:
:
::I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.
::

12/10/2006 6:16:23 PMRadiodoc

Bruce,

As for the filaments, I believe the 5Z4 is rated 5 volts AC at 2 amps. The other filaments add up to 1.9 at 6.3 volts AC.

Radiodoc

:Thanks Mr. Radio Doc :>) I should have seen that, but I am still not a seasoned veteran and pointing out what should have been obvious is still something I need. I am almost embarassed, but not quite. I find a horizontal mount xformer in the AES catalog that provides 325-0-325, @ 40ma, 5v @ 2A and 6.3v @ 2A. I have lots of experiences in digital electronics, but I am definately limited on radios. I think 325 is fine for the 315 replacement, but the 40ma for the high voltage and the 2amps for the filiment are just guesses to me. I have no idea if this is enough output to replace the original part. A simple yes or no is a good answer, but I am really trying to learn to figure these things out, so if there is a magic formula or something else I overlooked, I would appreciate nothing that. Thanks for all the help, it is appreciated. By the way, I just added a Majestic Grandfather clock/radio to my collection today, works perfeclty and what a catch. Beautiful piece for the hallway :>)
:
::Bruce,
::
::You can find the service data on this site under Resources at:
::
::http://www.nostalgiaair.org/Resources/099/M0015099.htm
::
::I believe the socket voltage page shows the rectifier plate voltage at 315-0-315.
::
::Radiodoc
::
::
:::I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.
:::

12/18/2006 6:40:41 AMEd

Bruce: The rating you mentioned for the B+ current, for that replacement transformer was 40 milliamps, I believe. That is marginal for your radio. The 6F6, alone, should draw about 35 milliamps, and all the other tubes together draw another ten or fifteen. You should go for a transformer rated at 50 milliamps or 70 milliamps B+ draw. I find good ones at hamfests and radio flea-markets, and keep old Stancor and UTC catalogs on the bench so as to recognize good radio replacement models. You need a Stancor PM8402 or PM8403 or Triad R-108B.
Ed

:Bruce,
:
:As for the filaments, I believe the 5Z4 is rated 5 volts AC at 2 amps. The other filaments add up to 1.9 at 6.3 volts AC.
:
:Radiodoc
:
::Thanks Mr. Radio Doc :>) I should have seen that, but I am still not a seasoned veteran and pointing out what should have been obvious is still something I need. I am almost embarassed, but not quite. I find a horizontal mount xformer in the AES catalog that provides 325-0-325, @ 40ma, 5v @ 2A and 6.3v @ 2A. I have lots of experiences in digital electronics, but I am definately limited on radios. I think 325 is fine for the 315 replacement, but the 40ma for the high voltage and the 2amps for the filiment are just guesses to me. I have no idea if this is enough output to replace the original part. A simple yes or no is a good answer, but I am really trying to learn to figure these things out, so if there is a magic formula or something else I overlooked, I would appreciate nothing that. Thanks for all the help, it is appreciated. By the way, I just added a Majestic Grandfather clock/radio to my collection today, works perfeclty and what a catch. Beautiful piece for the hallway :>)
::
:::Bruce,
:::
:::You can find the service data on this site under Resources at:
:::
:::http://www.nostalgiaair.org/Resources/099/M0015099.htm
:::
:::I believe the socket voltage page shows the rectifier plate voltage at 315-0-315.
:::
:::Radiodoc
:::
:::
::::I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.
::::

12/19/2006 8:49:45 PMBruce Walters

Thanks to all for the advice, I was concerned about the current capacity of the smaller transformer, so i went up to an 70 ma. Just installed it today and it works beautifully. I checked everything downstream with a meter as best I could, figuring the may have been a reason for the faioure, but I found nothing else wrong, so I bit the bullet and powered it up! To my great surprise, it works! THANKS TO ALL, YOUR A GREAT RESOURCE AND I APPREIATE THE HLP.

:Bruce: The rating you mentioned for the B+ current, for that replacement transformer was 40 milliamps, I believe. That is marginal for your radio. The 6F6, alone, should draw about 35 milliamps, and all the other tubes together draw another ten or fifteen. You should go for a transformer rated at 50 milliamps or 70 milliamps B+ draw. I find good ones at hamfests and radio flea-markets, and keep old Stancor and UTC catalogs on the bench so as to recognize good radio replacement models. You need a Stancor PM8402 or PM8403 or Triad R-108B.
:Ed
:
:
::Bruce,
::
::As for the filaments, I believe the 5Z4 is rated 5 volts AC at 2 amps. The other filaments add up to 1.9 at 6.3 volts AC.
::
::Radiodoc
::
:::Thanks Mr. Radio Doc :>) I should have seen that, but I am still not a seasoned veteran and pointing out what should have been obvious is still something I need. I am almost embarassed, but not quite. I find a horizontal mount xformer in the AES catalog that provides 325-0-325, @ 40ma, 5v @ 2A and 6.3v @ 2A. I have lots of experiences in digital electronics, but I am definately limited on radios. I think 325 is fine for the 315 replacement, but the 40ma for the high voltage and the 2amps for the filiment are just guesses to me. I have no idea if this is enough output to replace the original part. A simple yes or no is a good answer, but I am really trying to learn to figure these things out, so if there is a magic formula or something else I overlooked, I would appreciate nothing that. Thanks for all the help, it is appreciated. By the way, I just added a Majestic Grandfather clock/radio to my collection today, works perfeclty and what a catch. Beautiful piece for the hallway :>)
:::
::::Bruce,
::::
::::You can find the service data on this site under Resources at:
::::
::::http://www.nostalgiaair.org/Resources/099/M0015099.htm
::::
::::I believe the socket voltage page shows the rectifier plate voltage at 315-0-315.
::::
::::Radiodoc
::::
::::
:::::I am having the time of my life fixing these oldies, thanks to this forum and now I am trying to get info on the right power tranformer to use in my RCA 6K. My grandaughter turned it on one day and I discovered that fact coincident with the smell, which was of course too late. I know I need to check everything downstream from the transformer to make sure there is nothing shorted etc. The power tranformer is horizontal mount, the filiment volyage for most of the tubes is 6.3 and the rectifier is 5 volts. I don't know the high voltage output from the transfomer. I would really like to know what replacement transformer to order using the Antique Electronics supply catalog. Way too many choices for dart throwing and too expensive to be wrong. Any knowledge would be greatly appreciated.
:::::