I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al

Al

Although not shown on the schematic there will be trimmer caps. Adjust these at high end of the band.

http://www.nostalgiaair.org/PagesByModel/465/M0025465.pdf

Norm

:I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al
:

Hi Norm:
I found three trimmers on the top of the chassis. Two of them are next to the Osc. coil. The third next to the IF trans. They did help in adjusting the low end of the dial but had little impact on the high end. Would the tuning cap cause the loss of volumne if the plates were touching? The osc. seems to be working ok on the high end. Thanks again. Al

Al
:
: Although not shown on the schematic there will be trimmer caps. Adjust these at high end of the band.
:
:http://www.nostalgiaair.org/PagesByModel/465/M0025465.pdf
:
:Norm
:
::I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al
::
:
:

Al

Platse touching will stop reception and can be a problem at low end of the dial.

For top end of a band there should be trimmer caps. Second page in Rider has alignment. Have you tried that?

What gets me, trimmers are not shown on the RF or antenna coils. You need trimmers there to peak up the high end. The only other way is adjusting the oscillator. This will move stations but you could adjust for max volume.

Norm

Norm

:Hi Norm:
:I found three trimmers on the top of the chassis. Two of them are next to the Osc. coil. The third next to the IF trans. They did help in adjusting the low end of the dial but had little impact on the high end. Would the tuning cap cause the loss of volumne if the plates were touching? The osc. seems to be working ok on the high end. Thanks again. Al
:
:Al
::
:: Although not shown on the schematic there will be trimmer caps. Adjust these at high end of the band.
::
::http://www.nostalgiaair.org/PagesByModel/465/M0025465.pdf
::
::Norm
::
:::I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al
:::
::
::
:
:

Norm: I really appreciate your help on this. I have not tried an alignment but will do that. No trimmers that I can see on either the antenna or RF. I did tweak the osc. and that improved it somewhat but it is not anywhere close to where it should be. About half way through the dial it gets quiet like it is grounding out which made me think the plates might be touching or something else is happening. Many thanks for all you have done to get me through some tough projects. Al

:Al
:
: Platse touching will stop reception and can be a problem at low end of the dial.
:
: For top end of a band there should be trimmer caps. Second page in Rider has alignment. Have you tried that?
:
: What gets me, trimmers are not shown on the RF or antenna coils. You need trimmers there to peak up the high end. The only other way is adjusting the oscillator. This will move stations but you could adjust for max volume.
:
: Norm
:
:Norm
:
::Hi Norm:
::I found three trimmers on the top of the chassis. Two of them are next to the Osc. coil. The third next to the IF trans. They did help in adjusting the low end of the dial but had little impact on the high end. Would the tuning cap cause the loss of volumne if the plates were touching? The osc. seems to be working ok on the high end. Thanks again. Al
::
::Al
:::
::: Although not shown on the schematic there will be trimmer caps. Adjust these at high end of the band.
:::
:::http://www.nostalgiaair.org/PagesByModel/465/M0025465.pdf
:::
:::Norm
:::
::::I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al
::::
:::
:::
::
::
:
:

:Norm:

I pulled the tuner, cleaned and straightened a couple of plates replaced the rubber washers, aligned as you suggested and it's playing great. Thanks for the help. Al

:Al
:
: Although not shown on the schematic there will be trimmer caps. Adjust these at high end of the band.
:
:http://www.nostalgiaair.org/PagesByModel/465/M0025465.pdf
:
:Norm
:
::I could use some suggestions about a Zenith 9S 54 that I’m working on. I’ve recapped it and replaced the filters. It plays really well on the low end of the dial. When I tune it to the upper ranges the volume becomes barely audible. I’ve adjusted both Ifs to see if that would help but it doesn’t. I’m not sure where else to look. The tuning capacitor looks ok but there is a section that is not visible unless I remove it from the chassis. All the coils seem to have continuity. Any thoughts would be greatly appreciated. Al
::
:
: