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RCA 9Y510 radio is heard when switch is in phono position
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David
Dec 26, 2012, 8:36:56 PM12/26/12
to
Hope someone can help with this one. I am working on a RCA 9Y510 45 rpm
record player radio combination. It has a 7 position tone and power switch.
The first three are for the radio and give different tone control settings.
The next three do the same but are supposed be for when the phono is being
used The first phono position is fine. The next two I can hear the radio, at
a reduced volume, playing along with the phono input. I suspect a capacitor
but there are many in the tone circuit and do not want to switch them out
one at a time.
Any tips?
David
record player radio combination. It has a 7 position tone and power switch.
The first three are for the radio and give different tone control settings.
The next three do the same but are supposed be for when the phono is being
used The first phono position is fine. The next two I can hear the radio, at
a reduced volume, playing along with the phono input. I suspect a capacitor
but there are many in the tone circuit and do not want to switch them out
one at a time.
Any tips?
David
William Sommerwerck
Dec 26, 2012, 10:38:21 PM12/26/12
to
Despite its seemingly high level, this crosstalk might be normal for this
product.
In any case, start by thoroughly cleaning the switch.
product.
In any case, start by thoroughly cleaning the switch.
nesesu
Dec 28, 2012, 12:58:41 PM12/28/12
to
On Wednesday, December 26, 2012 5:36:56 PM UTC-8, David wrote:
> Hope someone can help with this one. I am working on a RCA 9Y510 45 rpm record player radio combination. It has a 7 position tone and power switch. The first three are for the radio and give different tone control settings. The next three do the same but are supposed be for when the phono is being used The first phono position is fine. The next two I can hear the radio, at a reduced volume, playing along with the phono input. I suspect a capacitor but there are many in the tone circuit and do not want to switch them out one at a time. Any tips? David
According to the schematic, the B+ should be cut off to the IF amp when switched to phono and there should be no possibility of radio reception, let alone cross-talk. Compare the switch wiring to the schematic and see if that has been messed up. A first quick test is to monitor the voltage on the plate of the IF 12BA6 when switched to phono and if there is voltage there, something is wrong in the wiring. Since this is an AA5 type chassis, all safety precautions should be used [isolation transformer, isolated meter, etc.]
> Hope someone can help with this one. I am working on a RCA 9Y510 45 rpm record player radio combination. It has a 7 position tone and power switch. The first three are for the radio and give different tone control settings. The next three do the same but are supposed be for when the phono is being used The first phono position is fine. The next two I can hear the radio, at a reduced volume, playing along with the phono input. I suspect a capacitor but there are many in the tone circuit and do not want to switch them out one at a time. Any tips? David
Neil S.
oldco...@gmail.com
Dec 28, 2012, 4:29:20 PM12/28/12
to
One would think B+ would be shut off to the converter stage as well as the IF. Maybe not though.
Bill(oc)
Bill(oc)
David
Dec 28, 2012, 10:39:50 PM12/28/12
to
I checked the b + and it was around 94 volts in the radio position. When I
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
wrote in message
news:65a0227a-0841-41ad...@googlegroups.com...
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
wrote in message
news:65a0227a-0841-41ad...@googlegroups.com...
David
Dec 28, 2012, 10:40:12 PM12/28/12
to
I checked the b + and it was around 94 volts in the radio position. When I
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
wrote in message
news:65a0227a-0841-41ad...@googlegroups.com...
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
wrote in message
news:65a0227a-0841-41ad...@googlegroups.com...
David
Dec 28, 2012, 10:41:39 PM12/28/12
to
I checked the b + and it was around 94 volts in the radio position. When I
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
"nesesu" wrote in message
switched to the first phono position the voltage dropped to .2 volts and I
do not hear any radio but when I go to the next two tone control settings
the voltage stays at .2 but I hear the same radio station. Go figure. It is
a lower volume but very easy to hear and my hearing is far from perfect.
Quite a challenge it seems..
news:922d7571-08d4-418b...@googlegroups.com...
David
Dec 28, 2012, 10:42:26 PM12/28/12
to
Brenda Dyer
Dec 28, 2012, 11:45:08 PM12/28/12
to
"David" wrote in message news:kbloqu$308$1...@dont-email.me...
--------------------------------------------------------------------------------
Are you sure it's the same station you have tuned in? Try tuning the radio
while in phono mode, and see if it changes. It's possible that what's
happening is that the phono input is picking up a strong local station and
the first AF stage is detecting it.
nesesu
Dec 29, 2012, 1:43:17 AM12/29/12
to
On Friday, December 28, 2012 8:45:08 PM UTC-8, Brenda Dyer wrote:
> "David" wrote in message news:I checked the b + and it was around 94 volts in the radio position. When I switched to the first phono position the voltage dropped to .2 volts and I do not hear any radio but when I go to the next two tone control settings the voltage stays at .2 but I hear the same radio station. Go figure. It is a lower volume but very easy to hear and my hearing is far from perfect. Quite a challenge it seems.. -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Are you sure it's the same station you have tuned in? Try tuning the radio while in phono mode, and see if it changes. It's possible that what's happening is that the phono input is picking up a strong local station and the first AF stage is detecting it.
It's also possible that a strong station will give enough signal out of the 1st IF transformer [from the plate of the 12BE6 that is running wide open] to leak around the 12BA6 and into the 2nd IF transformer and be detected, but I think that the schematic showed that the AF into the 12AV6 was selected from the phono, so that route is a stretch. With David's response, I was also leaning towards Brenda's suggestion.
I surmise that they left the 12BE6 powered to keep it hot and minimize LO drift when switching back to radio, other wise it would be sensible to cut off the B+ to the 12BE6 on phono, as well.
Neil S.
> "David" wrote in message news:I checked the b + and it was around 94 volts in the radio position. When I switched to the first phono position the voltage dropped to .2 volts and I do not hear any radio but when I go to the next two tone control settings the voltage stays at .2 but I hear the same radio station. Go figure. It is a lower volume but very easy to hear and my hearing is far from perfect. Quite a challenge it seems.. -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Are you sure it's the same station you have tuned in? Try tuning the radio while in phono mode, and see if it changes. It's possible that what's happening is that the phono input is picking up a strong local station and the first AF stage is detecting it.
It's also possible that a strong station will give enough signal out of the 1st IF transformer [from the plate of the 12BE6 that is running wide open] to leak around the 12BA6 and into the 2nd IF transformer and be detected, but I think that the schematic showed that the AF into the 12AV6 was selected from the phono, so that route is a stretch. With David's response, I was also leaning towards Brenda's suggestion.
I surmise that they left the 12BE6 powered to keep it hot and minimize LO drift when switching back to radio, other wise it would be sensible to cut off the B+ to the 12BE6 on phono, as well.
Neil S.
William Sommerwerck
Dec 29, 2012, 9:27:02 AM12/29/12
to
Have you cleaned the switch?
If the radio pickup is due to detection, try yanking the tubes and cleaning
the pins and sockets, as well.
If the radio pickup is due to detection, try yanking the tubes and cleaning
the pins and sockets, as well.
David
Dec 29, 2012, 6:43:50 PM12/29/12
to
Sorry for the multiple posts. Microsoft Live Mail was telling me the message
could not be sent.
I cleaned the selector switch, the volume control, and tube sockets with
deoxit. No change. It is functioning like a 4 tube radio and I can change
the stations and hear them in two of the three "phono" positions. I noticed
it is coming through the phono input connection. If I short it, there is no
sound. Though why it does not happen in all three phono positions is not
clear. I have not replaced the caps in the tone circuit so that may be the
reason.
I did alter the b + connection so when it is in the phono position no b +
goes to the converter tube and that stopped it.
David
"nesesu" wrote in message
news:70e29e89-64b7-4148...@googlegroups.com...
On Friday, December 28, 2012 8:45:08 PM UTC-8, Brenda Dyer wrote:
> "David" wrote in message news:I checked the b + and it was around 94 volts
> in the radio position. When I switched to the first phono position the
> voltage dropped to .2 volts and I do not hear any radio but when I go to
> the next two tone control settings the voltage stays at .2 but I hear the
> same radio station. Go figure. It is a lower volume but very easy to hear
> and my hearing is far from perfect. Quite a challenge it
> seems.. --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------Are you sure it's the same station you have tuned in? Try tuning the radiowhile in phono mode, and see if it changes. It's possible that what'shappening is that the phono input is picking up a strong local station andthe first AF stage is detecting it.It's also possible that a strong station will give enough signal out of the1st IF transformer [from the plate of the 12BE6 that is running wide open]to leak around the 12BA6 and into the 2nd IF transformer and be detected,but I think that the schematic showed that the AF into the 12AV6 wasselected from the phono, so that route is a stretch. With David's response,I was also leaning towards Brenda's suggestion.I surmise that they left the 12BE6 powered to keep it hot and minimize LOdrift when switching back to radio, other wise it would be sensible to cutoff the B+ to the 12BE6 on phono, as well.Neil S.
could not be sent.
I cleaned the selector switch, the volume control, and tube sockets with
deoxit. No change. It is functioning like a 4 tube radio and I can change
the stations and hear them in two of the three "phono" positions. I noticed
it is coming through the phono input connection. If I short it, there is no
sound. Though why it does not happen in all three phono positions is not
clear. I have not replaced the caps in the tone circuit so that may be the
reason.
I did alter the b + connection so when it is in the phono position no b +
goes to the converter tube and that stopped it.
David
"nesesu" wrote in message
news:70e29e89-64b7-4148...@googlegroups.com...
On Friday, December 28, 2012 8:45:08 PM UTC-8, Brenda Dyer wrote:
> "David" wrote in message news:I checked the b + and it was around 94 volts
> in the radio position. When I switched to the first phono position the
> voltage dropped to .2 volts and I do not hear any radio but when I go to
> the next two tone control settings the voltage stays at .2 but I hear the
> same radio station. Go figure. It is a lower volume but very easy to hear
> and my hearing is far from perfect. Quite a challenge it
> seems.. --------------------------------------------------------------------------------
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