Atwater Kent dead

1/2/2011 4:42:30 PMJohn

My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.

1/2/2011 6:00:09 PMNorm Leal

Hi John

Should hear something even with antenna choke open.

http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf

Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.

Norm

:My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
:

1/2/2011 6:33:53 PMJohn

:Hi John
:
: Should hear something even with antenna choke open.
:
:http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf
:
: Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.
:
:Norm
:
:
:
::My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
::
:
:

1/2/2011 6:35:05 PMJohn

:Hi John
:
: Should hear something even with antenna choke open.
:
:http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf
:
: Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.
:
:Norm
:
:
:
::My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
::
:
:

1/2/2011 6:37:25 PMJohn

Norm,
Plate and screens seem normal. With second detector 24 tube grid wire removed there is a moderate sound of buzzing. Not very loud at all.
Thanks,
John

::Hi John
::
:: Should hear something even with antenna choke open.
::
::http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf
::
:: Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.
::
::Norm
::
::
::
:::My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
:::
::
::
:
:

1/2/2011 6:46:24 PMNorm Leal

John

If you were to touch top of the 24 detector, without grid cap connected, noise should be loud. Check continuity of audio choke between 24 and 47 tubes.

Since the choke was bad could antenna coil also be open? There is another choke in series with volume control. See if it's open?

You mentioned the oscillator operates and have reasonable plate and screen voltages. Should be within 20 percent or so of Rider voltages.

Norm

:Norm,
:Plate and screens seem normal. With second detector 24 tube grid wire removed there is a moderate sound of buzzing. Not very loud at all.
:Thanks,
:John
:
:
:
:
:::Hi John
:::
::: Should hear something even with antenna choke open.
:::
:::http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf
:::
::: Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.
:::
:::Norm
:::
:::
:::
::::My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
::::
:::
:::
::
::
:
:

1/2/2011 7:14:23 PMJohn

Norm,
The volume control seemed funny. Would go all the way around and not hit a stop so tried replacing it and no difference. Found one of the wires to it was dressed behind a metal shield and the insulation wore off so maybe was touching ground. Isolated it and got sound. Seems to work now.
Thanks,
John

:John
:
: If you were to touch top of the 24 detector, without grid cap connected, noise should be loud. Check continuity of audio choke between 24 and 47 tubes.
:
: Since the choke was bad could antenna coil also be open? There is another choke in series with volume control. See if it's open?
:
: You mentioned the oscillator operates and have reasonable plate and screen voltages. Should be within 20 percent or so of Rider voltages.
:
:Norm
:
:
:
:
:
::Norm,
::Plate and screens seem normal. With second detector 24 tube grid wire removed there is a moderate sound of buzzing. Not very loud at all.
::Thanks,
::John
::
::
::
::
::::Hi John
::::
:::: Should hear something even with antenna choke open.
::::
::::http://www.nostalgiaair.org/PagesByModel/491/M0001491.pdf
::::
:::: Have you measured plate and screen voltages on tubes? If you remove top connection on 2nd detector, 24 tube, the radio should make a loud noise. This will show if audio circuit is operating.
::::
::::Norm
::::
::::
::::
:::::My AK model 84 is dead. I can find oscillator signal but no station signal. Notice the antenna choke coil across the antenna trimmer was open. The fine wire was broke in about six places. Maybe got tickled from lightning? Will that kill the station sound? How can I repair it? Tried feeding the antenna around this coil but nothing.
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