Hello All,
There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
If I had a schematic it would help. But it's probably very similar to many other radios from that time.
If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
What should I check first?

Thanks,

Dave

Hello Again All,
I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.

Thanks,

Dave
:Hello All,
: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
: What should I check first?
:
:Thanks,
:
:Dave
:

Edd,
This first step was done by someone who had this radio before me.
I found that same picture on the internet. The negative stripes on the new capacitors are facing the other way. My guess is that the old capacitors had a + stripe.

What do I look at next?

Thanks,

Dave
:
:
:

: : : : : : : : : :Sir Dave. . . . . . : : : :Have you initially, already changed out ALL of the units 100 year old blue electrolytics . . . particularly those encircling the speakers pot magnet ? : : : : : : :Thasssit . . . . : : : : : : : : :73's de Edd : : : : : : : : : :HEY ! ! ! ! : : : :I finally found the difference between an oral and a rectal thermometer? -- The taste! : : : : : : : : : : : : : : : :

:
:
:
:
:
::Hello Again All,
:: I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.
::
:: Thanks,
::
::Dave
:::Hello All,
::: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
::: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
::: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
::: What should I check first?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:

Edd,
You're the expert. So I will turn them all around. How do
I know that all the values are correct? I can't find the service data anywhere.

Thanks Very Much,

Dave
:
:
:

: : : : : : : : : :Sir Dave. . . . . . : : : :Black lines/stripes . . . . au Japonie . . . are Negative terminal coding. Red dots, if being used; are the Positive electrolytic terminal coding. : : :This reference below gives you movable zoom capabilities on a units photo. :Now be sure the persons installs were polarized properly with the black stripes being the negatives on this ORIGINAL units photo. : : : : :http://www.ebay.com/itm/VINTAGE-PANASONIC-SUPER-7-TRANSISTOR-RADIO-R-1147-/321304161018?nma=true&si=%252FEgDesWnDDE1qIRYzKfXpVYbQKk%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 : : : : :Thasssit . . . . : : : : : : : : :73's de Edd : : : : : : : : : : : : :The difference between snowmen and snowladies? . . . . . . . . . . Snowballs : : : : : : : : : : : : : : : :

:
:
:
::Edd,
:: This first step was done by someone who had this radio before me.
::I found that same picture on the internet. The negative stripes on the new capacitors are facing the other way. My guess is that the old capacitors had a + stripe.
::
::What do I look at next?
::
::Thanks,
::
::Dave
:::
:::
:::

::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir Dave. . . . . . ::: ::: ::: :::Have you initially, already changed out ALL of the units 100 year old blue electrolytics . . . particularly those encircling the speakers pot magnet ? ::: ::: ::: ::: ::: ::: :::Thasssit . . . . ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: ::: ::: ::: ::: ::: :::HEY ! ! ! ! ::: ::: ::: :::I finally found the difference between an oral and a rectal thermometer? -- The taste! ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::

:::
:::
:::
:::
:::
::::Hello Again All,
:::: I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.
::::
:::: Thanks,
::::
::::Dave
:::::Hello All,
::::: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
::::: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
::::: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
::::: What should I check first?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
:

Edd,
The minus terminal on one of the capacitors that appears to be in backwards is connected to the minus battery terminal. I do remember seeing old electrolytic capacitors like that in other old transistor radios with stripes that had + signs on them.
I would really like to see the service data, if I could.

Thanks,

Dave
:
:
:

: : : : : : : : : :Sir Dave. . . . . . : : : :Black lines/stripes . . . . au Japonie . . . are Negative terminal coding. Red dots, if being used; are the Positive electrolytic terminal coding. : : :This reference below gives you movable zoom capabilities on a units photo. :Now be sure the persons installs were polarized properly with the black stripes being the negatives on this ORIGINAL units photo. : : : : :http://www.ebay.com/itm/VINTAGE-PANASONIC-SUPER-7-TRANSISTOR-RADIO-R-1147-/321304161018?nma=true&si=%252FEgDesWnDDE1qIRYzKfXpVYbQKk%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 : : : : :Thasssit . . . . : : : : : : : : :73's de Edd : : : : : : : : : : : : :The difference between snowmen and snowladies? . . . . . . . . . . Snowballs : : : : : : : : : : : : : : : :

:
:
:
::Edd,
:: This first step was done by someone who had this radio before me.
::I found that same picture on the internet. The negative stripes on the new capacitors are facing the other way. My guess is that the old capacitors had a + stripe.
::
::What do I look at next?
::
::Thanks,
::
::Dave
:::
:::
:::

::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir Dave. . . . . . ::: ::: ::: :::Have you initially, already changed out ALL of the units 100 year old blue electrolytics . . . particularly those encircling the speakers pot magnet ? ::: ::: ::: ::: ::: ::: :::Thasssit . . . . ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: ::: ::: ::: ::: ::: :::HEY ! ! ! ! ::: ::: ::: :::I finally found the difference between an oral and a rectal thermometer? -- The taste! ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::

:::
:::
:::
:::
:::
::::Hello Again All,
:::: I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.
::::
:::: Thanks,
::::
::::Dave
:::::Hello All,
::::: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
::::: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
::::: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
::::: What should I check first?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
:

:
:
:

: : : : : : : : : :Sir Dave. . . . . . : : : :Black lines/stripes . . . . au Japonie . . . are Negative terminal coding. Red dots, if being used; are the Positive electrolytic terminal coding. : : :This reference below gives you movable zoom capabilities on a units photo. :Now be sure the persons installs were polarized properly with the black stripes being the negatives on this ORIGINAL units photo. : : : : :http://www.ebay.com/itm/VINTAGE-PANASONIC-SUPER-7-TRANSISTOR-RADIO-R-1147-/321304161018?nma=true&si=%252FEgDesWnDDE1qIRYzKfXpVYbQKk%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 : : : : :Thasssit . . . . : : : : : : : : :73's de Edd : : : : : : : : : : : : :The difference between snowmen and snowladies? . . . . . . . . . . Snowballs To Edd: Recmcber the "Tickle me Elmo" craze? I heard that the last thing done to the toy was to give it two test tickles. Lewis : : : : : : : : : : : : : : : :

:
:
:
::Edd,
:: This first step was done by someone who had this radio before me.
::I found that same picture on the internet. The negative stripes on the new capacitors are facing the other way. My guess is that the old capacitors had a + stripe.
::
::What do I look at next?
::
::Thanks,
::
::Dave
:::
:::
:::

::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir Dave. . . . . . ::: ::: ::: :::Have you initially, already changed out ALL of the units 100 year old blue electrolytics . . . particularly those encircling the speakers pot magnet ? ::: ::: ::: ::: ::: ::: :::Thasssit . . . . ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: ::: ::: ::: ::: ::: :::HEY ! ! ! ! ::: ::: ::: :::I finally found the difference between an oral and a rectal thermometer? -- The taste! ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::

:::
:::
:::
:::
:::
::::Hello Again All,
:::: I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.
::::
:::: Thanks,
::::
::::Dave
:::::Hello All,
::::: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
::::: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
::::: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
::::: What should I check first?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
:

Edd,
The secondary winding of the third IF transformer was open. I replaced it and all that whistling is gone.

Dave
:
:
:

: : : : : : : : : :Sir Dave. . . . . . : : : :Black lines/stripes . . . . au Japonie . . . are Negative terminal coding. Red dots, if being used; are the Positive electrolytic terminal coding. : : :This reference below gives you movable zoom capabilities on a units photo. :Now be sure the persons installs were polarized properly with the black stripes being the negatives on this ORIGINAL units photo. : : : : :http://www.ebay.com/itm/VINTAGE-PANASONIC-SUPER-7-TRANSISTOR-RADIO-R-1147-/321304161018?nma=true&si=%252FEgDesWnDDE1qIRYzKfXpVYbQKk%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 : : : : :Thasssit . . . . : : : : : : : : :73's de Edd : : : : : : : : : : : : :The difference between snowmen and snowladies? . . . . . . . . . . Snowballs : : : : : : : : : : : : : : : :

:
:
:
::Edd,
:: This first step was done by someone who had this radio before me.
::I found that same picture on the internet. The negative stripes on the new capacitors are facing the other way. My guess is that the old capacitors had a + stripe.
::
::What do I look at next?
::
::Thanks,
::
::Dave
:::
:::
:::

::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir Dave. . . . . . ::: ::: ::: :::Have you initially, already changed out ALL of the units 100 year old blue electrolytics . . . particularly those encircling the speakers pot magnet ? ::: ::: ::: ::: ::: ::: :::Thasssit . . . . ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: ::: ::: ::: ::: ::: :::HEY ! ! ! ! ::: ::: ::: :::I finally found the difference between an oral and a rectal thermometer? -- The taste! ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::

:::
:::
:::
:::
:::
::::Hello Again All,
:::: I can also hear two stations at once if one is stronger than the other. It should have better adjacent channel rejection than this.
::::
:::: Thanks,
::::
::::Dave
:::::Hello All,
::::: There's a lot of heterodyne sounds when tuning this radio. When I bring another transistor radio near this one, the oscillator can only be picked up when the Panasonic is tuned to the lowest end of the band, and nowhere els. So I think that either the oscillator is way off, or off completely at the upper end of the band. Plus, no matter how the oscillator is set, there is no upper end to the band. I think it stops at around 1300 Khz.
::::: If I had a schematic it would help. But it's probably very similar to many other radios from that time.
::::: If anyone knows what I might check. Maybe the antenna coil (coil on the antenna) isn't connected correctly? Maybe the antenna coil is open? (I can check that). One of the disc capacitors has failed? Not aligned properly? Bad oscillator transistor? Bad oscillator coil? Without the service data, it will be somewhat difficult to align, but not impossible.
::::: What should I check first?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
: