Today I just picked up an RCA model K80, looks complete except for the dial glass and missing one knob. The tube all test ok, will start replacing caps and resistors (as needed) this week. I noticed when I got it home that there is a different speaker mounted in the cabinet, not hooked up, since it doesn't have a socket for the speaker plug. Any way i can wire this speaker plug to work on this speaker? Speaker looks to be a fairly new one, 10" with positive/negative posts.

any help for this newbie would be appreciated!
thnaks! Don.

Don, here's the schematic: http://www.nostalgiaair.org/PagesByModel/513/M0015513.pdf

This set uses an electrodynmic speaker with a field coil in addition to the voice coil. If that's what you have, then you can go ahead and hook it up. You can haywire it around the socket, following the schematic.

If the speaker you have is a permanent magnet type, then you can install a 1K-ohm, 10-W power resistor in place of the field coil.

:Today I just picked up an RCA model K80, looks complete except for the dial glass and missing one knob. The tube all test ok, will start replacing caps and resistors (as needed) this week. I noticed when I got it home that there is a different speaker mounted in the cabinet, not hooked up, since it doesn't have a socket for the speaker plug. Any way i can wire this speaker plug to work on this speaker? Speaker looks to be a fairly new one, 10" with positive/negative posts.
:
:any help for this newbie would be appreciated!
:thnaks! Don.

Thanks for replying Doug. Got the schematic in fron tof me. The speaker in this cabinet is a PM type, not an electrodynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!

Thanks for all of the help so far! Don.

:Don, here's the schematic: http://www.nostalgiaair.org/PagesByModel/513/M0015513.pdf
:
:This set uses an electrodynmic speaker with a field coil in addition to the voice coil. If that's what you have, then you can go ahead and hook it up. You can haywire it around the socket, following the schematic.
:
:If the speaker you have is a permanent magnet type, then you can install a 1K-ohm, 10-W power resistor in place of the field coil.
:
:
::Today I just picked up an RCA model K80, looks complete except for the dial glass and missing one knob. The tube all test ok, will start replacing caps and resistors (as needed) this week. I noticed when I got it home that there is a different speaker mounted in the cabinet, not hooked up, since it doesn't have a socket for the speaker plug. Any way i can wire this speaker plug to work on this speaker? Speaker looks to be a fairly new one, 10" with positive/negative posts.
::
::any help for this newbie would be appreciated!
::thnaks! Don.

But be very careful. The field coil wiring of a dynamic speaker has full B+ voltage on it. The old speaker cord is often frayed.

:Today I just picked up an RCA model K80, looks complete except for the dial glass and missing one knob. The tube all test ok, will start replacing caps and resistors (as needed) this week. I noticed when I got it home that there is a different speaker mounted in the cabinet, not hooked up, since it doesn't have a socket for the speaker plug. Any way i can wire this speaker plug to work on this speaker? Speaker looks to be a fairly new one, 10" with positive/negative posts.
:
:any help for this newbie would be appreciated!
:thnaks! Don.

Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
Thanks for all of the help so far! Don.

Don, the original dynamic speaker for this radio had a hum-bucking coil in series with the voice coil.

With your PM speaker, there is no hum-bucker, so don't worry about it. But, under no circumstances should any part of the resistor (substituting for the field coil) be connected to the PM speaker. The resistor itself should be mounted in the radio (or on top of the chassis for heat dissipation, not at the PM speaker) - even though the original field coil was part of the dynamic speaker.

Where is the audio output transformer (T2) mounted? On the radio or the speaker? You want your PM speaker (which should have only two connections) connected to the two secondary terminals of T2. The 1K power resistor is now going to be completly separate and remote from the PM speaker, and never the twain shall meet.

There should be only two wires going to the PM speaker. There will be three wires going to the audio ouput xfmr primary, because this is a push-pull amplifier.

I hope that somebody else will chime in here and possibly help clarify things. But before you put power to anything, make sure we're all on the same wavelength here.

:
:Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
:Thanks for all of the help so far! Don.
:

Sorry to confuse everyone..
There is no audio output transformer under (T2) under the chassis, I'll have to assume that it was mounted on the original speaker, which was removed. The only thing leading from the chassis is the 4 pin socket, which is on the schematics (wires- blk, blk, brn/blk, brn). The speaker that was mounted in the cabinet isn't hooked up to anything (must have been put in for looks).. wish i realized that when i got it.. cabinet is in great shape.. for 10 bucks (ebay) hopefully i didnt get a piece of junk..

Guess i'll have to add a transformer too? now i'm really confused! Sorry to complicate things

:Don, the original dynamic speaker for this radio had a hum-bucking coil in series with the voice coil.
:
:With your PM speaker, there is no hum-bucker, so don't worry about it. But, under no circumstances should any part of the resistor (substituting for the field coil) be connected to the PM speaker. The resistor itself should be mounted in the radio (or on top of the chassis for heat dissipation, not at the PM speaker) - even though the original field coil was part of the dynamic speaker.
:
:Where is the audio output transformer (T2) mounted? On the radio or the speaker? You want your PM speaker (which should have only two connections) connected to the two secondary terminals of T2. The 1K power resistor is now going to be completly separate and remote from the PM speaker, and never the twain shall meet.
:
:There should be only two wires going to the PM speaker. There will be three wires going to the audio ouput xfmr primary, because this is a push-pull amplifier.
:
:I hope that somebody else will chime in here and possibly help clarify things. But before you put power to anything, make sure we're all on the same wavelength here.
:
:
::
::Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
::Thanks for all of the help so far! Don.
::

:Don, the original dynamic speaker for this radio had a hum-bucking coil in series with the voice coil.
:
:With your PM speaker, there is no hum-bucker, so don't worry about it. But, under no circumstances should any part of the resistor (substituting for the field coil) be connected to the PM speaker. The resistor itself should be mounted in the radio (or on top of the chassis for heat dissipation, not at the PM speaker) - even though the original field coil was part of the dynamic speaker.
:
:Where is the audio output transformer (T2) mounted? On the radio or the speaker? You want your PM speaker (which should have only two connections) connected to the two secondary terminals of T2. The 1K power resistor is now going to be completly separate and remote from the PM speaker, and never the twain shall meet.
:
:There should be only two wires going to the PM speaker. There will be three wires going to the audio ouput xfmr primary, because this is a push-pull amplifier.
:
:I hope that somebody else will chime in here and possibly help clarify things. But before you put power to anything, make sure we're all on the same wavelength here.

OK, I will. I think you would be well advised to be sure the voice coil side of the output transformer is totally isolated from anything else. There will be two wires, probably of a larger guage than the others, and will show about zero Ohms form one to the other. Two of the other three wires coming out of the transformer should go to the plates of the 6F6s, and one to the 10 uFd filter cap that the field used to go to, and these will have 350-400 Volts on them when the radio is on. The field coil of the speaker is there as part of the power supply and they only used it for an electromagnet until permanant magnets got strong enough to do the job alone. Once again, the voice coil of the PM speaker should connect to the output of the transformer, and nothing else in the radio.
Lewis L.
:
::
::Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
::Thanks for all of the help so far! Don.
::

Perhaps I'm not giving enough information regarding my problem. There is a PM speaker inside the cabinet not mounted to anything, the 2 posts on the speaker have never been wired to anything. There is a 4 prong cable hanging down which would have plugged into the original speaker with the transformer (i looked and there is no audio output transformer anywhere on or under the chassis). I checked my local electronics supply store for their stock of transformers with no luck. So, it looks like I need to pick up a transformer and the power resistor? Or perhaps someone knows where I can found a replacement speaker/coil assembly that i could just plug in? I've been looking on the net and ebay, etc.. with no luck.

Any suggestions? Please help!
Thanks a million folks, Don

::Don, the original dynamic speaker for this radio had a hum-bucking coil in series with the voice coil.
::
::With your PM speaker, there is no hum-bucker, so don't worry about it. But, under no circumstances should any part of the resistor (substituting for the field coil) be connected to the PM speaker. The resistor itself should be mounted in the radio (or on top of the chassis for heat dissipation, not at the PM speaker) - even though the original field coil was part of the dynamic speaker.
::
::Where is the audio output transformer (T2) mounted? On the radio or the speaker? You want your PM speaker (which should have only two connections) connected to the two secondary terminals of T2. The 1K power resistor is now going to be completly separate and remote from the PM speaker, and never the twain shall meet.
::
::There should be only two wires going to the PM speaker. There will be three wires going to the audio ouput xfmr primary, because this is a push-pull amplifier.
::
::I hope that somebody else will chime in here and possibly help clarify things. But before you put power to anything, make sure we're all on the same wavelength here.
:
: OK, I will. I think you would be well advised to be sure the voice coil side of the output transformer is totally isolated from anything else. There will be two wires, probably of a larger guage than the others, and will show about zero Ohms form one to the other. Two of the other three wires coming out of the transformer should go to the plates of the 6F6s, and one to the 10 uFd filter cap that the field used to go to, and these will have 350-400 Volts on them when the radio is on. The field coil of the speaker is there as part of the power supply and they only used it for an electromagnet until permanant magnets got strong enough to do the job alone. Once again, the voice coil of the PM speaker should connect to the output of the transformer, and nothing else in the radio.
:Lewis L.
::
:::
:::Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
:::Thanks for all of the help so far! Don.
:::

:Perhaps I'm not giving enough information regarding my problem. There is a PM speaker inside the cabinet not mounted to anything, the 2 posts on the speaker have never been wired to anything. There is a 4 prong cable hanging down which would have plugged into the original speaker with the transformer (i looked and there is no audio output transformer anywhere on or under the chassis). I checked my local electronics supply store for their stock of transformers with no luck. So, it looks like I need to pick up a transformer and the power resistor? Or perhaps someone knows where I can found a replacement speaker/coil assembly that i could just plug in? I've been looking on the net and ebay, etc.. with no luck.
:
:Any suggestions? Please help!
:Thanks a million folks, Don

Of course, you dont need an exact K80 transformer. The 6F6 has, I'm sure, a later model, perhaps (somebody help me here)a 6V6, that was used in some cheap "Hi Fi" amps, also in the push pull configuration of your radio. Find a modern equivalant of the 6F6, and finding a transformer should be easy.

That should be a right good sounding radio.

Lewis L.

::Perhaps I'm not giving enough information regarding my problem. There is a PM speaker inside the cabinet not mounted to anything, the 2 posts on the speaker have never been wired to anything. There is a 4 prong cable hanging down which would have plugged into the original speaker with the transformer (i looked and there is no audio output transformer anywhere on or under the chassis). I checked my local electronics supply store for their stock of transformers with no luck. So, it looks like I need to pick up a transformer and the power resistor? Or perhaps someone knows where I can found a replacement speaker/coil assembly that i could just plug in? I've been looking on the net and ebay, etc.. with no luck.
::
::Any suggestions? Please help!
::Thanks a million folks, Don
:
:Of course, you dont need an exact K80 transformer. The 6F6 has, I'm sure, a later model, perhaps (somebody help me here)a 6V6, that was used in some cheap "Hi Fi" amps, also in the push pull configuration of your radio. Find a modern equivalant of the 6F6, and finding a transformer should be easy.
:
:That should be a right good sounding radio.
:
:Lewis L.
:
:

Hi, I 've been reading the post and advice on how to hook in the speaker . Learned a few things there. There may be audio transformers at Radio Daze on the web .Some where out there is a original speaker(ebay maybe).Maybe not right away but eventually you might pick one up.
I just did a rca220 with much help from the people here. Even if you get your speaker going and it sounds great you might want to keep an eye out for the original parts.They are still out there somewhere.If you find then your issues go away.Any way I think there are parts at radio daze , search the web there is stuff out there . Good luck !!!

Bill

:Perhaps I'm not giving enough information regarding my problem. There is a PM speaker inside the cabinet not mounted to anything, the 2 posts on the speaker have never been wired to anything. There is a 4 prong cable hanging down which would have plugged into the original speaker with the transformer (i looked and there is no audio output transformer anywhere on or under the chassis). I checked my local electronics supply store for their stock of transformers with no luck. So, it looks like I need to pick up a transformer and the power resistor? Or perhaps someone knows where I can found a replacement speaker/coil assembly that i could just plug in? I've been looking on the net and ebay, etc.. with no luck.
:
:Any suggestions? Please help!
:Thanks a million folks, Don
:
:
:
:
:::Don, the original dynamic speaker for this radio had a hum-bucking coil in series with the voice coil.
:::
:::With your PM speaker, there is no hum-bucker, so don't worry about it. But, under no circumstances should any part of the resistor (substituting for the field coil) be connected to the PM speaker. The resistor itself should be mounted in the radio (or on top of the chassis for heat dissipation, not at the PM speaker) - even though the original field coil was part of the dynamic speaker.
:::
:::Where is the audio output transformer (T2) mounted? On the radio or the speaker? You want your PM speaker (which should have only two connections) connected to the two secondary terminals of T2. The 1K power resistor is now going to be completly separate and remote from the PM speaker, and never the twain shall meet.
:::
:::There should be only two wires going to the PM speaker. There will be three wires going to the audio ouput xfmr primary, because this is a push-pull amplifier.
:::
:::I hope that somebody else will chime in here and possibly help clarify things. But before you put power to anything, make sure we're all on the same wavelength here.
::
:: OK, I will. I think you would be well advised to be sure the voice coil side of the output transformer is totally isolated from anything else. There will be two wires, probably of a larger guage than the others, and will show about zero Ohms form one to the other. Two of the other three wires coming out of the transformer should go to the plates of the 6F6s, and one to the 10 uFd filter cap that the field used to go to, and these will have 350-400 Volts on them when the radio is on. The field coil of the speaker is there as part of the power supply and they only used it for an electromagnet until permanant magnets got strong enough to do the job alone. Once again, the voice coil of the PM speaker should connect to the output of the transformer, and nothing else in the radio.
::Lewis L.
:::
::::
::::Thanks for replying Doug. Got the schematic in front of me. The speaker in this cabinet is a PM type, not an dynamic type. I'll make sure to check all of the speaker wires before I do anything! Now for the confusing part for me.. If I'm correct, wire the new speaker to the pins marked on the schematic going to the neut coil and voice coil? Then wire the resistor between the pins that would have went to the field coil? There is one pin on the schematic that goes to both the field coil and the neut/voice coil.. do i connect this pin to both the resistor and speaker? Hope I'm not confusing you!
::::Thanks for all of the help so far! Don.
::::

Don,

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